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A review on proactive pomegranate one of the healthiest foods

Authors:
  • Agriculture University, Kota, Rajasthan, India

Abstract

Pomegranate a bioactive fruit being grown in tropical climatic conditions has various therapeutic benefits due to bioactive compounds in it. It is now being utilized in nutrition as well as medicinal industries due to its strong potential. It has potent nutritional values and immense health benefits. Pomegranate fruits, seeds and peels are intensively used in traditional medicine as a natural therapy. It contains plethora of valuable ingredients such as flavonoids, ellagitannin, punicalagin, ellagic acid, vitamins and minerals. The principal active constituents including punicalagins and ellagitannin are responsible for immeasurable health benefits due to its strong antioxidant activity. The pomegranate has been used since time immemorial in natural and holistic medicine therapies to treat sore throats, coughs, digestive disorders, urinary infections, skin disorders, arthritis, and to expel tapeworms. The health benefits reported word wide suggested that pomegranates might be useful in treating such serious conditions as different types of cancer, osteoarthritis, diabetes and Alzheimer. This is because pomegranates have the potential to thin the blood, increase blood flow to the heart, reduce blood pressure, and plaque in the arteries and ability to reduce bad cholesterol while increasing good cholesterol. Pomegranate juice can lower C-reactive proteins and reduce the inflammation of the lever. Juice of flower is used to treat nose bleeds. The fruit pulp and the seed are stomachic. Dried, pulverized flower buds are employed as a remedy for bronchitis. Research domain in this area is expanding rapidly and gaining popularity because of an understanding of the fact that naturally available phytonutrients along with polyphenols and antioxidants offer the available best protection against many diseases and disorders. Pomegranate protects our body in a cellular level. The objective of this review was to present a deep thought of the multi-functional, nutraceutical, bio-active components and medicinal effects of pomegranate in combating various human diseases, disorders and human ailments has been duly supported by various researchers in medicine, nutrition, biochemistry, physiology and horticultural sciences.
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International Journal of Chemical Studies 2019; 7(3): 189-194
P-ISSN: 23498528
E-ISSN: 23214902
IJCS 2019; 7(3): 189-194
© 2019 IJCS
Received: 11-03-2019
Accepted: 15-04-2019
Mahaveer Suman
Research Scholar, Ph.D. Fruit
Science, Deptt. of Fruit Science,
CH&F, Jhalawar, Rajasthan,
India
Prerak Bhatnagar
Assistant Professor (Fruit
Science), Deptt. of Fruit Science,
CH&F, Jhalawar, Rajasthan,
India
Correspondence
Mahaveer Suman
Research Scholar, Ph.D. Fruit
Science, Deptt. of Fruit Science,
CH&F, Jhalawar, Rajasthan,
India
A review on proactive pomegranate one of the
healthiest foods
Mahaveer Suman and Prerak Bhatnagar
Abstract
Pomegranate a bioactive fruit being grown in tropical climatic conditions has various therapeutic benefits
due to bioactive compounds in it. It is now being utilized in nutrition as well as medicinal industries due
to its strong potential. It has potent nutritional values and immense health benefits. Pomegranate fruits,
seeds and peels are intensively used in traditional medicine as a natural therapy. It contains plethora of
valuable ingredients such as flavonoids, ellagitannin, punicalagin, ellagic acid, vitamins and minerals.
The principal active constituents including punicalagins and ellagitannin are responsible for
immeasurable health benefits due to its strong antioxidant activity. The pomegranate has been used since
time immemorial in natural and holistic medicine therapies to treat sore throats, coughs, digestive
disorders, urinary infections, skin disorders, arthritis, and to expel tapeworms. The health benefits
reported word wide suggested that pomegranates might be useful in treating such serious conditions as
different types of cancer, osteoarthritis, diabetes and Alzheimer. This is because pomegranates have the
potential to thin the blood, increase blood flow to the heart, reduce blood pressure, and plaque in the
arteries and ability to reduce bad cholesterol while increasing good cholesterol. Pomegranate juice can
lower C-reactive proteins and reduce the inflammation of the lever. Juice of flower is used to treat nose
bleeds. The fruit pulp and the seed are stomachic. Dried, pulverized flower buds are employed as a
remedy for bronchitis. Research domain in this area is expanding rapidly and gaining popularity because
of an understanding of the fact that naturally available phytonutrients along with polyphenols and
antioxidants offer the available best protection against many diseases and disorders. Pomegranate
protects our body in a cellular level. The objective of this review was to present a deep thought of the
multi-functional, nutraceutical, bio-active components and medicinal effects of pomegranate in
combating various human diseases, disorders and human ailments has been duly supported by various
researchers in medicine, nutrition, biochemistry, physiology and horticultural sciences.
Keywords: PJ (Pomegranate juice), Anti-oxidants, Punicalagin, Ellagic acid
Introduction
Pomegranate (Punica granatum L.) is a shrub or small multi stem tree that grows
approximately 16 to 26 feet tall. Pomegranate has multiple long-lived branches and its leaves
are 2 cm wide and 3-7 cm long and flowers have 3-7 petals which are red in color. Fruit is
berry like with a leathery rind (husk or peel) enclosing many seeds surrounded by juicy arils
and seeds may vary from about 200 to 1400 in number. The husk is composed of two parts:
pericarp and mesocarp (albedo). Pomegranate tree is one of the oldest domesticated tree for its
countless health benefits, known even before the 21st Century. Folk medicines make use of all
parts of this tree. Various researchers have identified about 153 phytochemicals including their
derivatives in pomegranate. Polyphenols are the major class of phytochemicals, extracted from
almost all parts of pomegranate tree, but are most abundant in fruits. Flavonoids, hydrolysable
tannins and condensed tannins are the major pomegranate polyphenols. Anthocyanins, which
impart red colour to the arils, are most abundant and responsible for potential health benefits.
Pomegranate contain more than 18 hydrolysable tannins in leaves, bark and fruits, among
which gallotannins, ellagitannins, punicalgin and punicalin have attracted most attention
among researches, and which are pomegranate’s most powerful antioxidants. Other
phytochemicals reported in pomegranate include catechin and procyanidins, organic acids,
phenolic acids, sterols, terpenoids, fatty acids, triglycerides, alkaloids and some other
compounds. The prophylactic and curative potential of these bioactive compounds has been
proved against cardiovascular diseases, hypertension, all types of cancers, inflammations,
hyperlipidemia, diabetes, ageing, Alzheimer’s disease, etc., and are, in addition, antibacterial,
antifungal, antiviral, anthelmintic, vermifugal tenicidal and molluscidal agents.
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International Journal of Chemical Studies
Pomegranate juice contains 3-fold more antioxidants than
green tea and red wine as well as several common fruits like
apples, grapes, etc. Researchers have used various
technologies to extract, purify and analyse these
phytochemicals for chemical characterization and evaluation
of their antioxidant capacities.
Nutritional value of pomegranate
Pomegranate is a rich source of these bioactive compounds.
Nutrients content in a fruit may change during the
development of the tree, during fruit maturation, under
different environmental and cultivation conditions and
between pomegranate cultivars. It is a diet full of nourishment
for growing children, ageing/elderly or sick persons and
pregnant women. It has the power to cure hunger, quench
thirst and refresh the drunkard. The pomegranate fruits are
consumed fresh or used for the preparation of fresh juice,
jelly, jam, and paste and also for flavoring and coloring the
culinary preparations. The fruit has been regarded as a
“healing food” with numerous beneficial effects in several
diseases. Pomegranate peel comprises about 50% of the total
fruit weight and is an important source of minerals especially
potassium, calcium, phosphorus, magnesium, and sodium;
complex polysaccharides and high levels of diverse range of
bioactive compounds such as phenolics, flavonoids,
proanthocyanidin compounds and ellagitannin (ETs), as well
as punicalagins and its isomers, as well as lesser amounts of
punicalin, gallagic acid, ellagic acid, and ellagic acid
glycosides. Pomegranate seed oil (PSO) contains an
exceptional conjugated fatty acid called punicic acid (trienoic
acid) that makes up approximately 65% to 80% of the oil
from pomegranate seeds. Punicic acid is also referred as a
super conjugated linolenic acid whose effect is even more
potent than that of an ordinary conjugated linolenic acid.
Seeds also contain protein, crude fibers, vitamins, minerals,
pectin, sugars, polyphenols, isoflavones, the phytoestrogens,
coumestrol and the sex steroid, estrone. The edible part of the
pomegranate fruit (50%) consists of 40% arils and 10% seeds.
The fresh juice contains 85% water, 10% total sugars, 1.5%
pectin, ascorbic acid and polyphenolic flavonoids (El-Nemr et
al. 1990) [6]. The major sugars as reported by Ozgen (2008)
were fructose (6.4 g/100 ml) and glucose (6.8 g/100 ml); the
major acids were citric (1.78 g/100 ml) and malic (0.12 g/100
ml). They further reported that pomegranate is a rich source
of Vitamin C, Vitamin K, Vitamin B6 and pantothenic acid
(Vitamin B5). It also consists of Vitamin A, Vitamin E,
thiamin and riboflavin in small amounts. In addition to these,
niacin and folate are present in traces. Pomegranate is a rich
source of minerals like potassium and copper and is very low
in sodium, hence useful in the control of hypertension. Iron is
present in small quantity, while traces of magnesium,
phosphorus, zinc and selenium are also there. Ascorbic acid
(vitamin C) content varies with varieties. The quality studies
reported ascorbic acid content to vary between 52.8 to 72.0
mg/100 g fresh weight (fw) for arils and 76.8 to 118.4 mg/100
g fw for peels and it was found significantly higher in peels
than the arils, with differences ranging from 24.4 to 97.0%
depending on variety (Opara et al. 2009) [14]. PJ is considered
beneficial for diabetics, despite the juice containing
significant sugar concentrations. The explanation given in
support of this is that, “In most juices, sugars are present in
free and harmful forms but in PJ, however, the sugars are
attached to unique antioxidants the polyphenols forming a
complex, which actually make these sugars protective against
atherosclerosis” (Rock et al. 2008) [16]. Rozenbers et al.
(2006) [17] concluded from their study that PJ consumption by
diabetic patients does not worsen their diabetic parameters but
contributes to serum paraoxonase-1 stabilization, increased
association with HDL cholesterol, and enhanced catalytic
activities, leading to retardation of atherosclerosis
development in diabetic patients. The fruit is low in fats (<
0.12 g/100 g arils) and sweet varieties have almost half the fat
content than that of bitter/ sour varieties (Hernandez et al.
2001) [7].
Health benefits
Although many phytochemicals have positive effect on
health, very many can be toxic and harmful, however, plants
containing the most harmful phytochemicals are usually not
treated as foods. The major health benefits of pomegranate are
because of its anthocyanin contents, which are present in
appreciably large quantities and have antioxidant properties.
Andreu et al. (2008) [3] recently reviewed composition of
pomegranate fruit juice, beneficial health effects, including
association with anti carcinogenicity and anti-inflammatory
properties.
Antioxidant properties
Pomegranate possesses punicalagins which are extremely
potent antioxidants found in pomegranate juice and peel.
They are of so high potency that pomegranate juice has been
found to be three times the antioxidant activity of red wine
and green tea and eight times higher levels than those dictated
in grapes, grapefruit, and orange juices, respectively. The
pomegranate extract and powder is typically made from peel
due to its high antioxidant and punicalagin content. The
antioxidant agents reduce oxidative damage (damage due to
oxygen) such as that caused by free radicals, which are highly
reactive chemicals and attack molecules by capturing
electrons and thus modifying chemical structures. Oxidative
damage (oxidation) to the cells is partly responsible for the
effects of ageing and certain diseases. Cells produce free
radicals that are deficient in electron. In order to stabilize
these free radicals react by taking electrons from certain key
components in the cell and in the process, they damage these
cells. Antioxidants divert this damage by donating electrons
to the free radicals and stabilize them, thus, saving cell
components from the scavenging effect of free radicals. The
environment is also a source of free radicals caused by
ultraviolet radiation or airborne pollutants, such as cigarette
smoke. It is a well known fact that most free radical damage
is repaired naturally; a fraction may however, remain
unrepaired. This free radical damage may reduce or takeover
the body's natural defense. Punicalagin as a core element
supports human health by protecting cells from being
damaged by UV radiations by keeping more cells out of
harm’s way. Increase in cell damage with lapse of time leads
to ageing and diseases like cancers, cardiovascular problems
and some other problems. Polyphenols and vitamins, which
have antioxidant properties, in one’s diet help in countering
some of the damage. Polyphenols especially anthocyanins and
vitamins, present in appreciably large quantities in
pomegranate can play an important role in benefiting human
health.
Cancer cells
Cancer is caused as a result of disfunctioning of immense
system due to multi-factors and numerous diseases involved
in this process. In this vista, pomegranates fruits, seed and
peels illustrate cancer preventive role and mechanism which
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International Journal of Chemical Studies
seems to be due to rich source of antioxidants. Pomegranate
juice can hinder the proliferation of cancerous cells in human
body. It can block the flow of blood towards the tumors
resulting in reducing its size and ultimately its destruction.
Breast and prostate cancer cells have significant evidence of
slowing down the activities of malignant cells. Inhibition of
cancerous cells causing prostate cancer in adults has been
well recognized. Pomegranate extract also stops the
proliferation of these dangerous cells to other parts of the
body. Many phytochemicals have an anti- carcinogenic (anti-
cancer) action as they slow cell proliferation (division) by
interfering with the cell cycle, induce apoptosis (cell suicide)
inhibit phase 1 enzymes that convert harmless substances
into carcinogens and induce phase 2 enzymes enzymes that
can attach carcinogens to molecules that facilitate speedy
excretion (Best 2006) [4]. The pomegranate extract has shown
to induce programmed cell death and to inhibit tumor
invasion, proliferation and angiogenesis. The fruit juice, peel
and oil possess anticancer activities, including interference
with tumor cell proliferation, cell cycle, invasion and
angiogenesis (Lansky and Newman 2007) [11]. A wide variety
of plants produce phytoestrogen that are secondary
metabolites. Controversies on use of pharmacological
hormone replacement therapy (HRT) for the treatment of
menopausal symptoms necessitates further studies and
identification of natural sources of estrogen (Jordan 2003) [8].
Pomegranate was identified the best known source for curing
it. In fact, pomegranate tree is one of the only plants in nature
known to contain estrone (Van Elswijk et al. 2004) [21].
Because of its unique composition, seed-oil is a powerful
health-benefiting agent, due to its antioxidative, anticancer,
and antilipidemic properties. The extrogenic compounds
luteolin, quercetin and kaempferol have been identified in
pomegranate (Van Elswijk et al. 2004) [21]. Other major
components ellagic acid, caffeic acid and punicic acid found
in pomegranate fruit are having known anticancer activities.
Breast cancer
Extracts of pomegranate have anti estrogenic properties.
Hormone levels in serum are well controlled by pomegranate
extracts by inducing beneficial effects in blood plasma. The
extracts from peel, seed, the seed oil and fermented/
unfermented fruit juice all have suppressive effect on human
breast cancer cells (Settheetham et al. 1995) [19]. Bingham et
al. (1998) [5] had reported that diets rich in phytoestrogens
protect against breast, prostrate, colon cancer as well as
cardiovascular disease and osteoporosis. The whole
pomegranate seed oil is more chemopreventive for breast
cancer and avoids the use of chemical agents to slow the
development of cancer (Mehta and Lansky 2004) [13]. The
fermented PJ polyphenols in comparison to fresh juice
recorded approximately twice the antiproliferative activity
and inhibited cancerous lesion formation induced by a popular
carcinogen (Kim et al. 2002) [9]. Bioavailability and maximal
oral intake of pomegranate supplements juice extracts for
getting protein response in breast cancer. Tanner et al. (2008)
[20] in a study found that PJ may be a useful nutrient-based,
non-chemotherapeutic treatment alternative for the inhibition
of estrogen receptor negative breast cancer cell proliferations
of feline and human breast cancer cell types. It can delay the
onset of breast cancer by blocking aromatase enzymes and
cancer cell differentiation.
Colon cancer
PJ, ellagic acid, punicalgin and pomegranate tannins show
apoptosis in specific colon cell and get rid of unneeded or
abnormal cells. (Larrosa et al. 2006) [12]. Punicalgin is freely
bioavailable, body readily breaks down and as an antioxidant,
it helps to neutralize free radicals. Pomegranate seed oil
which is composed of 70% of conjugated linolenic acid,
suppress colon carcinogenesis hence, dietary pomegranate
seed oil significantly inhibits incidence of adenocarcinomas
(Kohno et al. 2004) [10]. In a study by Saruwatari et al. (2008)
[18], the results indicated that the inhibition of sulfotransferase
activity by punicalagin in Caco-2 cells was responsible for the
reductions seen in 1-naphthyl sulfate accumulation. They also
suggested that constituents of PJ, most probably punicalagin,
impair the enteric functions of sulfoconjugation and that this
might have positive effects upon the bioavailability of drugs
and other compounds present in food and in the environment.
These effects might be due to the anticarcinogenic properties
of PJ. Punicalgin is an ellagitannin, a type of phenolic
compound which is responsible for more than 50% of the
juice potent’s antioxidant activity. The maximum levels of
ellagic acid are present in pomegranate and anticarcinogenic
properties of ellagic acid has been found the probable anti-
inflammatory role in the treatment of lacerative colitis as to
present the development of colon cancer.
Skin cancer
Exposure to ultraviolet (UV) radiation has been associated
with several acute and chronic conditions. The UV-B
component may cause sunburn, hyperpigmentaion, edema,
hyperplasia, immunosuppression, photo ageing, and skin
cancer whereas UV-A may be responsible for tumor
formation. The biochemicals delphinidin, cyaniding and
pelargonidin, (anthocyanidins), Punicalin, pedunculagin,
punicalagin and gallagic and ellagic acid esters of glucose
(hydrolysable tannins) in pomegranate are strong antioxidants
and antinflamatory agents these compounds which account
for 92% of the antioxidant of the whole fruit (Afaq et al.
2005) [2], protect from ultraviolet radiation. Pomegranate fruit
extract contains antioxidants and anti-inflammatory
phytochemicals that can treat human epidermal keratinocytes.
Fruit extracts provided protection against Ultraviolet A
mediated activation of signal transducers and activators of
transcription.
Cholesterol level
The phytosterols in pomegranate both lower the existing LDL
cholesterol and cease the production of bad cholesterol.
Pomegranate is rich in major antioxidants like anthocyanins
and tannins that may help to block the buildup of cholesterol
in arteries which in return protect heart damage. Juice of this
fruit may help to reduce the concentration of low density
lipoproteins from the body which may protect the body from
stroke attack. Energy and body HDL levels decreased
showing beneficial effects of leaf extract of pomegranate.
Pomegranate juice decreased cholesterol absorption, increased
faecal excretion of cholesterol, had a favourable effect on
enzymes concerned in cholesterol metabolism, drastically
reduced LDL cholesterol, and improved LDL/HDL
cholesterol and total/HDL ratios (Esmaillzadeh et al., 2006)
[1]. Pomegranate juice consumption decreased LDL
susceptibility to aggregation and retention and increased the
activity of serum paraoxonase. Pomegranate juice improve
cholesterol profiles and treat the atherosclerotic plaque that
are responsible for many heart attacks and many strokes. All
these evidences suggest the potential cardioprotective effect
of pomegranate fruit.
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International Journal of Chemical Studies
Blood pressure
Systolic blood pressure can be reduced by juice of
pomegranate to a significant level. Potassium in it can prevent
arteries from stiffness and atherosclerosis. It improves blood
flow to the heart and reduces the incidents of heart attack.
Clinical examination of improving blood pressure and
endothelial functions of the body by consuming pomegranate
juice have been performed. Chronic administration of
pomegranate juice extract showed reduction in the mean
arterial blood pressure and vascular reactivity changes to
various catecholamines. The potent flavonoids such as
catechus, tannic and ellagic acid, make pomegranate a
stronger antioxidant than red wine and equal to or better than
green tea.
Memory and mood enhancer
Flavonoids are believed to improve memory from declining
and delay the onset of Alzheimer disease. These antioxidants
have potential role for fighting against depression that can
cause memory loss. Vinegar of pomegranate juice contains
flavonoids of deep red color that helps prevent against radical
formation. Pomegranate juice have natural compound Estrone
that improves mood in menopausal women. It is generally
believed that this compound can act as a replacement therapy
for women suffering from mood disturbances.
Arthritis and Joint Pain
The foods that are rich in nutrients, minerals and antioxidants
may help to neutralize rheumatoid arthritis. Pomegranate is
low in fat, cholesterol and sodium but rich in nutrients,
minerals and antioxidants. The studies suggested the extract
of pomegranate may block production of cartilage destroying
enzyme. Inflammation of joints can result in Pain and
swelling in later age. Presence of Flavones in pomegranate
extract has anti-inflammatory effects that may reduce
collagen induced arthritis and painful swelling of joints.
Cyclooxygenases and lipoxygenase enzymes inhibits by
extracts present in pomegranate seed oil. These key mediators
of inflammation decreases 75 percent by seed oil while
pomegranate juice causes 23.8 percent reduction in these
enzymes. In osteoarthritis these extracts diminishes matrix
metallo-proteinases which is involved in degradation of
extracellular joint matrix. It prevents collagen degradation and
stops joint destruction.
Bacterial infections
Antibiotics are effective remedy in the inhibition of bacteria
growth or growth of microorganism. The recent surge in
multi-drug resistant bacteria and the likely chance of
widespread global pandemics necessitate the need for
additional therapeutic options to counteract conventional
drugs. On the other side, antibiotics resistance against
microorganism is one of the major problems in the use of
antibiotics against microorganism. Pomegranate has millions
of bioactive compounds fighting against infections like
diarrhea and ulcers. Nearly every part of pomegranate plant
including ingredients of seeds, flowers, stem, bark and leaves
show very effective role in the inhibition of growth of
pathogens. Plants are one of the good sources of secondary
metabolites including tannins, terpenoids, alkaloids,
flavonoids and glycosides, which confirmed antimicrobial
activities. Ellagic and gallic acids as natural antimicrobial
agents has been used against Staphylococcus aureus and
Escherichia coli for their ability to precipitate membrane
proteins and inhibit enzymes that leads to lysis of cells.
Preservation and/or enhancement of probiotic bacteria in the
gut is important for maintaining gasterointestinal health.
Hypercholesterolaemia
A recent study shows that peel of pomegranate has prebiotic
potential for lowering down the fat content of the body. It
reduces the cholesterol of high fat diet over a period of 4
weeks and gut microbiota supports its action. Polyphenols
present in pomegranate has the ability to prevent
atherosclerosis and macrophage formation. This can be done
by either direct combination of polyphenols with lipoproteins
of the body or by indirect means through accumulation in
arterial microphages. This in return blocks the synthesis of
oxygen species and lipid peroxidation and lipid rich
microphages. It also results in hydrolysis of lipids in
atherosclerotic lesions.
Immune system
The benefits of pomegranate can be potentially utilized for the
people of lesser development countries. Various health
conditions related to throat and respiration can be resolved by
pomegranates. As this fruit is rich in iron content it ensures
normal platelet count of the body by which a person feels less
fatigue symptoms. These fruits are often recommended for
liver prevention. Pomegranate juice helps in the reduction of
platelet aggregation and oxidative stress in humans.
Pomegranate juice inhibits aggregation and oxidation of
atherosclerotic lesion and attenuate platelet activation.
Pomegranate exerts bactericidal activity against food and
water borne pathogenic bacteria.
Tooth loss
The flavonoids present in pomegranate exerts beneficial
action which are conducive to oral health. Pomegranate juice
is effective against dental plaque microorganisms decreasing
the CFU. Additionally, there was significant reduction in the
level of dental plaque microorganisms after the rinsing with
pomegranate juice. Dental plaque and tooth loss can be
prevented by seeds of this fruit. It possesses anti-microbial
functions which can be helpful against oral bacteria. Health of
gums can be improved by its seeds. It has been demonstrated
by performing a study regarding the ability of peel or pulp of
pomegranate richness in antioxidants. Flavonoids and
phenolic compounds were also high in peel extract that were
beneficial against oxidation and atherosclerosis and can be
used as a natural supplement.
Anti-diabetic effect
A range of studies evidences that medicinal plants or
constituents of medicinal plants show role in the management
of diabetes and its complication including Diabetic
retinopathy. By various studies it has been confirmed that by
giving 200 mg of peel extract according to per kg of the body
weight, polyphenols present in it affects glycemic index of the
body by either inhibiting the uptake of glucose to peripheral
tissues or by blocking its absorption by the gut.
Administration of crude powder of Punica granatum husk
decreased the concentration of glucose, triglycerides,
cholesterol, LDL cholesterol and raised the level of HDL
cholesterol and hemoglobin content in the blood. The well
known compounds in pomegranate like punicalagin acid,
ellagic, gallic, olaenolic, ursolic and uallic acids have been
recognized as having antidiabetic actions.
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International Journal of Chemical Studies
Pregnancy outcomes
Pomegranate is rich in antioxidants so they protect placenta
from oxygen reactive species. They also contain little amount
of folate that helps fight against birth defects. It can help in
the purification of blood and can enhance milk production.
Acidity of urine reduces by the intake of pomegranate juice
and improves health of urinary bladder by preventing harmful
bacteria from entering into the urinary tract. This prevents
inflammation and enhances immunity of the body. The intake
of pomegranate juice decreases placental oxidative stress in
vivo and in vitro and may limit placental injury and thus
confer protection to the exposed foetus.
Effect on reproductive system
Pomegranate shows pivotal role in the elevation of hormones
linked to reproductive system. Pomegranate juice showed
elevation in testosterone, luteinizing hormone and follicle
stimulating hormone depleted after the injection of carbon
tetra chloride (CCL4). Pomegranate extract and ascorbic acid
administration reduced the deleterious effect of lead acetate
on daily sperm production and epididymal sperm number. PJ
consumption showed increase in epididymal sperm
concentration, sperm motility and spermatogenic cell density.
Long-term pomegranate juice intake increased intracavernous
blood flow, improved erectile response and smooth muscle
relaxation in erectile dysfunction. Pomegranate increases
testosterone production which is primarily responsible for
men’s health both inside and outside. Pomegranate augments
nitric oxide; a vital ingredient for getting an erection
pomegranate tends to increase it most.
Conclusion
Pomegranate is a pivotal source of all essential nutrients and
rich in polyphenols particularly Ellagitannins (ET) and ellagic
acid (EA) which can be digested easily and refreshes
physically or mentally tired people from regular intake. All
parts of this fruit have been utilized in food industry for
prevention and treatment of various diseases. It has been
regarded best vis a vis green tea due to its strong antioxidant
potential. The biological screening of Punica granatum
extracts and compound have shown antioxidant,
antiperoxidative, antibacterial, inflammation, antitumor,
hepatoprotective, antiarthrogenic and antidiarrhoeal. It shows
no toxic effects to liver and other organs of pomegranate
extract and can be used as natural supplement. However, it is
the dire need of the time to promote its cultivation by
traditional and non- traditional means in order to gain benefits
of this fruit as well as to compete in global market for its
export. In addition to this more conclusive studies and
experiments are needed to evaluate effects of pomegranate in
treating diarrheal diseases and in preventing fungal
proliferation. The immense potential of this fruit in
overcoming infections can bring tremendous progress in
nutritional and therapeutic industries. The available research
offers substantial supplementation and evidence to enrich the
diet with pomegranate juice or extract to harness the benefits
for protecting us from important stresses and diseases
particularly diabetics, development of cancer and
improvement of oral health and skin texture. The wide array
of benefits can be utilized by inclusion of pomegranate in
dietary schedule.
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... Punicic acid, the primary fatty acid in PSO, belongs to the conjugated linolenic acid family and has potential anti-inflammatory and anticancer properties [56]. Pomegranate is rich in vitamins, including vitamins C and B [57]. Vitamin C, an antioxidant, safeguards cells from damage and supports the immune system [58]. ...
... Vitamin C, an antioxidant, safeguards cells from damage and supports the immune system [58]. The fruit contains essential minerals, including potassium and copper, crucial for bodily functions [57]. In addition to ellagic acid and punicalagin, pomegranate contains other polyphenols, such as catechins and epicatechins, contributing to its overall antioxidant capacity [13]. ...
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Pomegranate extract has potential benefits for women’s reproductive health, including fertility enhancement, menstrual cycle regulation, pregnancy support, and polycystic ovary syndrome (PCOS) treatment. It possesses antioxidant properties, reducing oxidative stress and improving fertility. Pomegranate extract may help regulate hormonal imbalances and promote regular menstrual cycles. The extract’s rich nutrient profile supports placental development and fetal growth and may reduce the risk of preterm birth. Additionally, pomegranate extract shows promise in improving insulin sensitivity and reducing inflammation and oxidative damage in PCOS. Some studies suggest its potential anticancer properties, particularly against breast cancer. However, further research, including human clinical trials, is necessary to establish its effectiveness and safety. The current evidence is limited and primarily based on in vitro studies, animal studies, and clinical trials. This review provides a comprehensive summary of the benefits of pomegranate extract for women’s reproductive health and breast cancer, serving as a reference for future research.
... Punicic acid, the primary fatty acid in PSO, belongs to the conjugated linolenic acid family and has potential anti-inflammatory and anticancer properties [58]. Pomegranate is rich in vitamins, including vitamins C and B [59]. Vitamin C, an antioxidant, safeguards cells from damage and supports the immune system [60]. ...
... Vitamin C, an antioxidant, safeguards cells from damage and supports the immune system [60]. The fruit contains essential minerals, including potassium and copper, crucial for bodily functions [59]. In addition to ellagic acid and punicalagin, pomegranate contains other polyphenols, such as catechins and epicatechins, contributing to its overall antioxidant capacity [13]. ...
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Pomegranate extract has potential benefits for women's reproductive health, including fertility enhancement, menstrual cycle regulation, pregnancy support, and polycystic ovary syndrome (PCOS) treatment. It possesses antioxidant properties, reducing oxidative stress and improving fertility. Phytoestrogens in pomegranate extract may help regulate hormonal imbalances and promote regular menstrual cycles. The extract's rich nutrient profile supports placental development and fetal growth and may reduce the risk of preterm birth. Additionally, pomegranate extract shows promise in improving insulin sensitivity and reducing inflammation and oxidative damage in PCOS. Some studies suggest its potential anticancer properties, particularly against breast cancer. However, further research, including human clinical trials, is necessary to establish its effectiveness and safety. The current evidence is limited and primarily based on in vitro studies, animal studies, and clinical trials. This review provides a comprehensive summary of the benefits of pomegranate extract for women's reproductive health and breast cancer, serving as a reference for future research.
... A and B (Cheng et al. 2023). Research has shown that ellagic acid, a key phenolic compound in pomegranate, has antityrosinase, antimicrobial, anti-inflammatory, anti-diabetic, anti-allergic, and anti-mutagenic properties and may help prevent Alzheimer's disease (Suman and Bhatnagar 2019;Kyriakoudi et al. 2021;Mansoury 2019). ...
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Nanophytosomes (NPS) loaded with whole pomegranate fruit extract with peel and arils (PFE) at different levels of phosphatidylcholine (PC) were produced using a thin‐film hydration method and reinforced with calcium ions. PFE was obtained by pressing whole pomegranates, followed by mixing with PC at ratios of 1:1, 1:2, and 1:3, which then strengthens the phytosome wall by CaCl2 solutions (1.35 and 2.70 mM) and lyophilized to create a stable powder form. The characteristics of the NP powders, including encapsulation efficiency (EE), particle size, ζ‐potential, polydispersity index (PDI), structure, microstructure, and thermal properties, were evaluated. Additionally, the storage stability of phenolic compounds over two months was investigated. The PFE powder demonstrated appropriate characteristics for incorporation into the phytosome system, with a total phenol content of 371.19 mg GAE/g dry weight, anthocyanins at 300.68 mg/g, flavonoids at 194 mg/100 g, and an antioxidant activity of 90.98%. The highest EE was determined to be 98.53%, indicating its unique ability as a nano‐carrier. PFE‐loaded NPs showed favorable characteristics, such as low PDI values (< 0.5), smaller particle size (170 nm), and a spherical morphology. The PFE‐NP had a particle size of 128.6 nm, zeta potential of −40.15 mV, mobility of −3.15 μm cm/Vs, PDI of 0.168, and EE of 98.53%. The optimized nanoparticles remained stable for two months at 4°C, with negligible changes in particle size (~10 nm), total phenol content (TPC), and PDI of the PFE‐Nanophytosomes. All NP samples showed better stability at storage temperatures over 60 days. PEF‐NPs improved the stability of phenolic compounds while improving solubility, masking taste, and delivery to target tissues, which can be considered in future applications.
... Pomegranate (Punica granatum L.) is regarded as one of the most ancient documented species of consumable fruit crops, probably originated in Iran (Khadivi-Khub et al., 2015). Because of the fruit's antioxidant properties, which contribute to health advantages such as preventing cardiovascular and hypertensive diseases, it contains anticarcinogenic (Suman et al., 2019) antimicrobial (Bikiaris et al., 2020;Peran et al., 2020) and antiatherosclerotic compounds even able to reduce LDL oxidation (Jandari et al., 2020). Pomegranate was planted in Asia, in America and in Mediterranean basin, where the optimal climatic conditions allow a great fruit maturity. ...
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Several studies have consistently underscored the crucial role of environmental conditions and cultivar type as the foremost factors impacting pomegranate adaptation. In this research, the productive potential, fruit biochemical traits, vegetative growth and physiological characteristics of eleven pomegranate genotypes were evaluated under Moroccan conditions. The results showed a highly significant variance among these cultivars across all assessed traits except the stomatal area. Fruit yield, fruit weight and juice content exhibited a wide spectrum, ranging from 21.88 - 79.03 kg tree-1, 429.2 - 288.88 g and 34.06 - 47.27% respectively. However, the chemical composition of the juice revealed considerable fluctuations, with total soluble solids ranging between 13.28 and 17.11 ºBrix, titratable acidity varied between 0.24 and 2.25% of citric acid. Biochemically, a discernible dissimilarity manifested among the assayed pomegranate cultivars; with a total sugar content varied between 74.14 and 147.56 g GE L-1 and a total phenol content of 0.69 - 3.21 g GAE L-1 and antioxidant activity of 27.61 - 67.49% respectively. In addition, the data analysis ‘Mollar Osin Hueso’ and ‘Zheri Precoce’ exhibited the highest annual shoot growth and leaf area, respectively, while ‘Ounk Hmam’ showcased the highest stomatal conductance, in stark contrast to the ‘Bzou’ cultivar, which registered the lowest value. These findings suggest that the cultivar type was the main factor influencing the fruit yield, the fruit's physic-biochemical properties, vegetative and physiological traits in pomegranate trees.
... These compounds have been associated with various health benefits, including cardiovascular protection and anticancer effects. Pomegranate seed oil, extracted from the seeds, is also valued for its potential culinary and medicinal uses (Faria & Calhau, 2011;Suman & Bhatnagar, 2019). Apple seeds contain fiber, healthy fats, and protein, making them nutritionally significant. ...
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Punica granutam, or Pomegranate, is a natural compound that can have anti-tumor effects on many cancers due to its useful active ingredient. To collect the results of published studies related to the effectiveness of the anti-tumor properties of pomegranate extract on various breast cancer cell lines from 2010 to 2024. Publications were searched based on appropriate keywords and phrases, following the PRISMA checklist, in various databases such as PubMed, Embase, Scopus, Google Scholar, and Web of Science from 2010 to 2024, as of May 25. A total of 523 publications were collected. Among these, only 15 were suitable for the study. Most of the results o indicated that pomegranate extract can inhibit the growth of breast cancer cells through different cellular and molecular mechanisms. In general, it seems that pomegranate extract can have antitumor properties on breast cancer. Therefore, using pomegranate extract and its derivatives can be recommended alone or with other therapeutic agents. More investigations are needed to validate this hypothesis.
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The objective of present study was to examine the potential use of pomegranate flower extracts (PFEs) obtained from water and ethanol at antimicrobial doses in nitrite‐reduced chicken sausages. The impact of the extracts on the physicochemical, textural, and sensory attributes of the sausages was evaluated using both reduced doses of nitrite and a nitrite‐free preparation. The results revealed that incorporating PFE resulted in a sixfold and twofold enhancement in total phenolic content and antioxidant activity, respectively. The DPPH radical scavenging activity in sausages produced with ethanol‐based PFE was more than twice as high as in sausages treated with sodium nitrite. Additionally, the combination of low‐dose nitrite with PFE showed a reduction in TBARS values, leading to the prevention of lipid oxidation. Sausages with PFE exhibited lower pH and redness values, while maintaining similar aroma and odor characteristics as the controls. Although there was a slight negative impact on texture, color, and overall acceptability, PFE can be considered a potential alternative for improving bioactive content and oxidative stability of low‐nitrite chicken sausages. The application of PFE could offer a promising opportunity to enhance the nutritional profile and quality attributes of processed meat products.
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The purpose of this study was to investigate the nutritional value of eight varieties of Punica granatum seeds grown in Morocco (INRA station) as a source of vegetable oil. To this end we have investigated the impact of cultivars on lipophilic bioactive compounds, including Fatty acid (FA), phytosterol, and tocopherols, as well as the qualitative, nutritional and metabolic potential of the seeds of this varieties. The lipid profile analysis of pomegranate seed oils from the eight varieties revealed a predominance of unsaturated fatty acids, notably punicic acid (77.49–82.93 %). In terms of sterols, β-sitosterol scored the highest values among the sterols identified (520.31–726.82 mg/100 g). The chemical composition of tocopherols showed γ-tocopherol to be the major component (343.22–567.40 mg/100 g), with the red pomegranate showing the highest γ-tocopherol value, while the yellow pomegranate marked the highest concentration of total tocopherols. Nutritional indices calculated on the basis of fatty acid composition show favorable profiles for the Sefri and Mollar Ossin Hueso varieties.
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Background and Objective: The outer layer of the Punica granatum L. fruit exhibits a high degree of durability. The majority of the plant's components have been utilized in traditional medicine for the treatment of various ailments. The medicinal properties of Punica granatum L. are anti-inflammatory, antioxidant and antibacterial activities. The present investigation was undertaken to establish the foundational pharmacognostic criteria that should be employed in the evaluation of the botanical specimens. Materials and Methods: In this study, an analysis was conducted on the phytochemical composition and microscopic characteristics of the fruit bark of Punica granatum L. Quantitative phytochemical information was assessed by conducting tests on three distinct extracts derived from the peel of Punica granatum L. fruit. Results: The periderm of the fruit exhibits a diverse array of microscopic characteristics, encompassing fibrous elements, sclerotic structures, stone cells, prismatic crystals, both simple and compound starch granules, oil droplets and fully developed parenchymal cells. The bark of Punica granatum fruits contains various bio-active compounds such as saponins, quinones, terpenoids, phenols, tannins, alkaloids, betacyanin, coumarins, phlobatannins, oil and fats. However, it is notable that glycosides and anthocyanin are not present in significant amounts. Conclusion: Pomegranate has a diverse array of potential therapeutic properties due to the presence of numerous chemical constituents. This research may contribute to the production of standardized products derived from this plant.
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Several fruit juices have been reported to cause food-drug interactions, mainly affecting cytochrome P450 activity; however, little is known about the effects of fruit juices on conjugation reactions. Among several fruit juices tested (apple, peach, orange, pineapple, grapefruit, and pomegranate), pomegranate juice potently inhibited the sulfoconjugation of 1-naphthol in Caco-2 cells. This inhibition was both dose- and culture time-dependent, with a 50% inhibitory concentration (IC(50)) value calculated at 2.7% (vol/vol). In contrast, no obvious inhibition of glucuronidation of 1-naphthol in Caco-2 cells was observed by any of the juices examined. Punicalagin, the most abundant antioxidant polyphenol in pomegranate juice, was also found to strongly inhibit sulfoconjugation in Caco-2 cells with an IC(50) of 45 microM, which is consistent with that of pomegranate juice. These data suggest that punicalagin is mainly responsible for the inhibition of sulfoconjugation by pomegranate juice. We additionally demonstrated that pomegranate juice and punicalagin both inhibit phenol sulfotransferase activity in Caco-2 cells in vitro, at concentrations that are almost equivalent to those used in the Caco-2 cells. Pomegranate juice, however, shows no effects on the expression of the sulfotransferase SULT1A family of genes (SULT1A1 and SULT1A3) in Caco-2 cells. These results indicate that the inhibition of sulfotransferase activity by punicalagin in Caco-2 cells is responsible for the reductions seen in 1-naphthyl sulfate accumulation. Our data also suggest that constituents of pomegranate juice, most probably punicalagin, impair the enteric functions of sulfoconjugation and that this might have effects upon the bioavailability of drugs and other compounds present in food and in the environment. These effects might be related to the anticarcinogenic properties of pomegranate juice.
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Fresh organically grown pomegranates (Punica granatum L.) of the Wonderful cultivar were processed into three components: fermented juice, aqueous pericarp extract and cold-pressed or supercritical CO2-extracted seed oil. Exposure to additional solvents yielded polyphenol-rich fractions ('polyphenols') from each of the three components. Their actions, and of the crude whole oil and crude fermented and unfermented juice concentrate, were assessed in vitro for possible chemopreventive or adjuvant therapeutic potential in human breast cancer. The ability to effect a blockade of endogenous active estrogen biosynthesis was shown by polyphenols from fermented juice, pericarp, and oil, which inhibited aromatase activity by 60-80%. Fermented juice and pericarp polyphenols, and whole seed oil, inhibited 17-beta-hydroxysteroid dehydrogenase Type 1 from 34 to 79%, at concentrations ranging from 100 to 1,000 microg/ml according to seed oil > fermented juice polyphenols > pericarp polyphenols. In a yeast estrogen screen (YES) lyophilized fresh pomegranate juice effected a 55% inhibition of the estrogenic activity of 17-beta-estradiol; whereas the lyophilized juice by itself displayed only minimal estrogenic action. Inhibition of cell lines by fermented juice and pericarp polyphenols was according to estrogen-dependent (MCF-7) > estrogen-independent (MB-MDA-231) > normal human breast epithelial cells (MCF-10A). In both MCF-7 and MB-MDA-231 cells, fermented pomegranate juice polyphenols consistently showed about twice the anti-proliferative effect as fresh pomegranate juice polyphenols. Pomegranate seed oil effected 90% inhibition of proliferation of MCF-7 at 100 microg/ml medium, 75% inhibition of invasion of MCF-7 across a Matrigel membrane at 10 microg/ml, and 54% apoptosis in MDA-MB-435 estrogen receptor negative metastatic human breast cancer cells at 50 microg/ml. In a murine mammary gland organ culture, fermented juice polyphenols effected 47% inhibition of cancerous lesion formation induced by the carcinogen 7,12-dimethylbenz[a]anthracene (DMBA). The findings suggest that clinical trials to further assess chemopreventive and adjuvant therapeutic applications of pomegranate in human breast cancer may be warranted.
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Pomegranate (Punica granatum L.) fruit is widely used in the food and process industries due to its excellent nutritional and health value and as a raw material for the manufacture of secondary products such as jellies, dyes, and cosmetics. The objectives of this research were to determine the vitamin C content and antimicrobial properties of fresh and dried fractions of fruit peel and arils of locally grown and imported pomegranate in Oman. A significant variation in vitamin C content was found among the five varieties of pomegranate studied, ranging from 52.8 to 72.0 mg/100 g fresh weight (fw) for arils and 76.8 to 118.4 mg/100 g fw for peels. Irrespective of the variety of pomegranate, vitamin C content in the peel was significantly higher than the aril, with differences ranging from 24.4% to 97.0% depending on variety. Fruit fractions showed antimicrobial effects (inhibition zone) on Staphylococcus aureus and Pseudomonas aeruginosa but not Escherichia coli. Sun drying of fruit peel significantly (p ≤ 0.05) enhanced vitamin C retention and antimicrobial effects in comparison with oven drying presumably due to lower rate of moisture removal associated with low temperature drying over longer duration in comparison with short-time high-temperature oven drying.
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The edible parts of pomegranate fruit represented 52% of total fruit weight, comprising 78% juice and 22% seeds. The fresh juice contained 85.4% moisture, 10.6% total sugars, 1.4% pectin, 0.1 g/100 ml total acidity (as citric acid), 0.7 mg/100 ml ascorbic acid, 19.6 mg/100 ml free amino nitrogen and 0.05 g/100 ml ash. Meanwhile, the seeds are a rich source of total lipids, protein, crude fibers and ash representing 27.2, 13.2, 35.3 and 2.0%, respectively, and also contained 6.0% pectin and 4.7% total sugars. The iron, cupper, sodium, magnesium and zinc contents of the juice were lower than those of seeds, except potassium which was 49.2 ppm in the juice. On the other hand, the physical and chemical properties of seed's lipids indicated that the refractive index was 1.518, melting point 13.0°C, iodine value 74.2, acid number 1.1, unsaponifiable matters 0.7%, saponification value 188.9, ester value 187.8 and glycerol content 10.3%. Moreover, the studied lipids contained 11 fatty acids, from them caprylic, the predominant acid, represented 36.3%, followed by stearic acid (22.5%). Furthermore, oleic and linoleic acids covered 5.1% and 10.3%, respectively. Otherwise, the saturated fatty acids of seed's lipids of pomegranate composed 83.6% of the total fatty acids content.
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Mammary cancer, a devastating disease in both humans and companion animals, has been associated with numerous factors including diet. Polyphenolic antioxidants found in pomegranate fruits have been shown to reduce tumor burden and inhibit angiogenesis and cell growth.(Kim et al., 2002; Afaq et al., 2005; Malik et al., 2005) Feline mammary carcinomas (FMC) are known to have similar invasive behavior, histologic appearance, and overall poor prognosis to estrogen receptor negative (ER-) invasive human mammary cancer.(Porrello et al., 2004; Zappulli et al., 2005) In this study, supplementation with an antioxidant-rich whole food (pomegranate) was evaluated for anti-cancer properties in an ER- human breast cancer cell line (MDA-MB-231) as a model for FMC. Antioxidant capacity and polyphenolic content of pomegranate juices (PJ) were characterized by reportable methods. ER- cells were exposed to PJ at various concentrations (0.5%, 1%, 5%) and to Cisplatin (5 ug/ml, 10 ug/ml, 15 ug/ml) doses for 48 and 72 h. MTT assays were performed to evaluate the ability of PJ to inhibit tumor cell growth. Statistical significance was determined using PROC GLM (SAS 9.1) with alpha = 0.05. Cell proliferation of the ER- cancer cells was inhibited by pomegranate juice in a dose- and time-dependent manner (p < 0.0001).Maximal inhibition was seen for pomegranate juice formulations at the 5% dose, and the response was comparable to that of high-dose Cisplatin. This first phase study shows that PJ may be a useful nutrient-based, non-chemotherapeutic treatment alternative for the inhibition of ER- breast cancer cell proliferation.
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Association of paraoxonase 1 (PON1) with high-density lipoprotein (HDL) stabilizes the enzyme. In diabetic patients, PON1 dissociates from HDL and, as a consequence, is less biologically active. Our aim was to investigate the effects of Wonderful variety pomegranate juice (WPJ) and pomegranate polyphenol extract (WPOMxl) consumption on PON1 association with HDL in diabetic patients. Thirty patients with type 2 diabetes mellitus participated in the study. Ten male patients and 10 female patients received concentrated WPJ (50 mL/day for 4 weeks), while another group of 10 male patients received WPOMxl (5 mL/day for 6 weeks). There were no significant effects of WPJ or WPOMxl consumption on fasting blood glucose or hemoglobin A1c levels. After 4 weeks of WPJ consumption by male patients, basal serum oxidative stress was significantly decreased by 35%, whereas serum concentrations of thiol groups significantly increased by 25%. Moreover, HDL-associated PON1 arylesterase, paraoxonase, and lactonase activities increased significantly after WPJ consumption by 34-45%, as compared to the baseline levels. PON1 protein binding to HDL was significantly increased by 30% following WPJ consumption, and the enzyme became more stable. In male patients that consumed WPOMxl and in female patients that consumed PJ, a similar pattern was observed, although to a lesser extent. We conclude that WPJ as well as WPOMxl consumption by diabetic patients does not worsen their diabetic parameters. Furthermore, WPJ as well as WPOMxl consumption contribute to PON1 stabilization, increased association with HDL, and enhanced catalytic activities. These beneficial effects of pomegranate consumption on serum PON1 stability and activity could lead to retardation of atherosclerosis development in diabetic patients.
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The use of medicinal herbs has been a common practice in Asia but their genotoxic properties are little known. In the present study, genotoxic effects of three antidiarrheal herbs, guava leaf, mangosteen peel and pomegranate peel, were examined using established human cell lines, Raji and P3HR-1. Cells were treated with boiled-water extract of the herbs at various concentrations for 24 and 48 hours in vitro. Cell growth and viability were dose dependently reduced. No apparent chromosomal aberrations were induced by the treatment. Administration of pomegranate extract induced apoptotic DNA fragmentation. This genotoxicity test system is simple and convenient for the primary screening.
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Phyto-oestrogens have emerged from their esoteric role in animal husbandry following the hypothesis that the human Western diet is relatively deficient in these substances compared with societies where large amounts of plant foods and legumes are eaten. Evidence is beginning to accrue that they may begin to offer protection against a wide range of human conditions, including breast, bowel, prostate and other cancers, cardiovascular disease, brain function, alcohol abuse, osteoporosis and menopausal symptoms. Of the two main classes of these weak oestrogens, the isoflavones are under intensive investigation due to their high levels in soyabean. Like the 'anti-oestrogen' Tamoxifen, these seem to have oestrogenic effects in human subjects in the cardiovascular system and bone. Although previously only available from food, isoflavones are now being marketed in health-food supplements or drinks, and tablets may soon be available over the counter as 'natural' hormone-replacement therapy. In cancer, anti-oestrogenic effects are thought to be important, although genistein especially has been shown to induce wide-ranging anti-cancer effects in cell lines independent of any hormone-related influence. There are few indications of harmful effects at present, although possible proliferative effects have been reported. In infants, the effects of high levels in soya milk formulas are uncertain. The second group, lignans, have been less investigated despite their known antioestrogenic effects and more widespread occurrence in foods. Investigation of the possible benefits of phyto-oestrogens is hampered by lack of analytical standards and, hence, inadequate methods for the measurement of low levels in most foods. This problem may prove to be a major dilemma for regulatory authorities, clinicians and others wishing to advise the general public on whether these compounds really do have the health benefits attributed to them.