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Volume 11, Issue 1, November – December 2011; Article-007 ISSN 0976 – 044X
International Journal of Pharmaceutical Sciences Review and Research
Page
32
Available online at
www.globalresearchonline.net
Madhu Gupta, Sushil Sharma, Ajay K. Gautam and Rekha Bhadauria*
School of Studies in Botany, Jiwaji University Gwalior (M.P.) 474011, India.
Accepted on: 21-07-2011; Finalized on: 20-10-2011.
ABSTRACT
Momordica charantia Linn. (karela) is an herbal climber grown in tropical and subtropical regions, belonging to the Cucurbitaceae
family. Momordica charantia (Karela) have provided many remedies for various diseases from ancient days to now a day. It has been
used in various Asian traditional medicines for the treatment of cholera, bronchitis, anemia, blood diseases, ulcer, diarrhea,
dysentery, gonorrhea rheumatism, gout, worms, colic, disease of liver and spleen, cancer and diabetes etc. The main constituents of
Karela are triterpene, protein, steroid, alkaloid, inorganic, lipid, and phenolic compounds, which are responsible for biological and
pharmacological activities including anti-diabetic, anti-cancerous and anti-tumorous, anti-microbial, anti-viral, anti-helmintic, anti-
malarial, anti-ulcerative and immunomodulatory. Combination of its Ayuervedic properties i.e. Gunna, Rasa and Virya (Dry, pungent,
light, bitter and hot) makes it the real natures wonder. In this article, general description, traditional uses and medicinal properties
of Momordica charantia Linn (Karela) have been reviewed.
Keywords: Momordica charantia Linn. (karela), general description, medicinal properties.
INTRODUCTION
Momordica charantia Linn. (Karela) commonly known as
Bitter melon or Bitter gourd is tropical and subtropical
climber of the family Cucurbitaceae. It is widely
distributed in China, Malaysia, India and tropical Africa.
The Latin name Momordica means “to bite” (referring to
the jagged edges of the leaf, which appear as if they have
been bitten). All parts of the plant, including the fruit
taste very bitter1, as it contains a bitter compound called
momordicin that is believed to have a stomachic effect2.
In Ayurveda, various parts of Momordica charantia
(Karela) are recommended for many diseases like;
cholera, bronchitis, anemia, blood diseases, ulcer,
diarrhea, dysentery, sexual tonic and as a cure for
gonorrhea3. Karela contains an array of biologically active
plant chemicals including triterpens, proteins, steroids,
alkaloids, saponins, flavonoids and acids due to which
plant possesses anti-fungal, anti-bacterial, anti-parasitic,
anti-viral, anti-fertility, anti-tumorous, hypoglycemic and
anti-carcinogenic properties4-8. Fruits are used as
traditional medication to cure various diseases like:
rheumatism, gout, worms, colic, disease of liver and
spleen9. It is also found useful in the treatment of cancer
and diabetes10. It is a potent hypoglycemic agent due to
alkaloids and insulin like peptides and a mixture of
steroidal sapogenins known as charantin11.
ORIGIN AND DISTRIBUTION
The Karela is believed to be originated in the tropics of
the old world. It is widely grown in India and other parts
of the Indian subcontinent, Southeast Asia, China, Africa,
and the Caribbean and South America as a food and
medicine12.
Cultivation
Karela is an annual or perennial climber found throughout
India and also cultivated up to an altitude of 1500m. It is
cultivated during warm season i.e. during April to July by
sowing seeds in a pit. Seeds are sown at a distance of half
a meter and provided with manures. Only one plant is
retained and plant seedlings are watered once or twice a
week. Plants begin to flower 30-35 days after sowing and
fruits are ready for harvesting after flowering 15-20
days13, 14.
GENERAL DESCRIPTION OF THE PLANT
Momordica charantia Linn. (Karela) has many synonyms
like M. chinensis, M. elegans, M. indica, M. operculata, M.
sinensis, Sicyos fauriei2. It is known with different
common names in different languages i.e. Hindi – Karela;
English – Bitter gourd; Sanskrit – Karavelli; Marathi – Karli;
Gujarati – Karelo; Bangali – Baramasiya; Kannada – Karali;
Malayalam – Kaypa; Tamil – Pakar; Telugu – Kakara15.
Botanical Description
Momordica charantia Linn. (Karela) (FIG.1) is a flowering
climber of family cucurbitaceae. The herbaceous, tendril-
bearing plant grows to six meter or longer. It bears
simple, alternate leaves 4-12 cm across, with 3-7 deeply
separated lobes (FIG.2). The lobes are mostly blunt, but
have small marginal points. Stipules are absent. Flowers
are actinomorphic and always unisexual. Perianth has a
short to prolonged epigynous zone; yellow on short
(female) or long (male) peduncles that are short-lived.
Fruit has ovoid, ellipsoid or spindle shaped usually distinct
warty looking exterior and an oblong shape (FIG.3). It is
hollow in cross-section with a relatively thin layer of flesh
surrounding a central seed cavity filled with large flat
seed and pith12. Seeds in size 8-13mm, long compressed,
corrugate on the margin, sculptured on both faces3.
MOMORDICA CHARANTIA
LINN. (KARELA):
NATURE’S SILENT HEALER
Review
Article
Volume 11, Issue 1, November – December 2011; Article-007 ISSN 0976 – 044X
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In India, it has typical morphology i.e. narrower shape,
pointed ends and surface covered with jagged, triangular
“teeth” and ridges with green coloration. It has a strong
bitter taste among all vegetables12.
Figure 1: Plant of Momordica Charantia bearing fruits
Figure 2: Leaves of Momordica Charantia
Figure 3: Fruits of Momordica Charantia
Parts Used
The fruits of bitter melon are utilized as vegetable where
as the whole plant parts like, fruits, leaves, roots and
seeds of bitter melon as medicine.
BIOLOGICAL ACTIVITIES
The different parts of the Karela contain following various
biological activities:
Root - Acrid, astringent, bitter.
Leaf - Antipyretic, bitter, emetic, purgative.
Fruits - Acrid, anthelmintic, anti-diabetic, anti
inflammatory, appetizer, bitter, depurative, digestive,
purgative, stimulant, stomachic, thermogenic15.
Ayurvedic Properties
Momordica charantia Linn. (Karela), a vegetable/
medicinal plant is used in the Ayurvedic system of
medicine for treating various diseases including diabetes
mellitus, measles, fever, hepatitis, itch etc.
According to Ayurveda it contains:
1. Gunna (properties) laghu (light), ruksh (dry)
2. Rasa (taste)
katu (bitter) and tikta (pungent)
3. Virya (potency) vshna (hot)
Combination of these properties makes karela a magic
potion for diseases15.
BIOCHEMICAL CONSTITUENTS
The main constituents of bitter melon (Karela) are
triterpene, protein, steroid, alkaloid, inorganic, lipid, and
phenolic compounds 5.
Momordica charantia (Karela) consists the following
chemical constituents those are alkaloids, momordicin
and charantin (FIG.4), charine, cryptoxanthin, cucurbitins,
cucurbitacins, cucurbitanes, cycloartenols, diosgenin,
elaeostearic acids, erythrodiol, galacturonic acids, gentisic
acid, goyaglycosides, goyasaponins, guanylate cyclase
inhibitors, gypsogenin, hydroxytryptamines, karounidiols,
lanosterol, lauric acid, linoleic acid, linolenic acid,
momorcharasides, momorcharins, momordenol,
momordicillin, momordicinin, momordicosides,
momordin, momordolo, multiflorenol, myristic acid,
nerolidol, oleanolic acid, oleic acid, oxalic acid,
pentadecans, peptides, petroselinic acid, polypeptides,
proteins, ribosome-inactivating proteins, rosmarinic acid,
rubixanthin, spinasterol, steroidal glycosides, stigmasta-
diols, stigmasterol, taraxerol, trehalose, trypsin inhibitors,
uracil, vacine, v-insuline, verbascoside, vicine, zeatin,
zeatinriboside, zeaxanthin, zeinoxanthin Amino acids-
aspartic acid, serine, glutamic acid, thscinne, alanine, g-
amino butyric acid and pipecolic acid, ascorbigen, b-
sistosterol-d-glucicide, citruline, elasterol, flavochrome,
lutein, lycopene, pipecolic acid16-18.
Volume 11, Issue 1, November – December 2011; Article-007 ISSN 0976 – 044X
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Fruits consists glycosides, saponins, alkaloids, reducing
sugars, resins, phenolic constituents, fixed oil and free
acids12.
Leaves are nutritious and have been reported as a source
of calcium (1%), magnesium (4%), potassium (7%),
phosphorus (5%), and iron (3%); fruits and leaves are
great source of B vitamins; Thiamine (vit.B1) 4%,
Riboflavin (vit.B2) 4%, Niacin (vit.B3)2%, vit.B6 3%, Folate
(vit.B9)13% 16, 2, 17.
Structure of Important Chemical Constituents
Charantin
Figure 4: Phytochemicals: Momordicin and Charantin
(Source: Kumar et al., 2010)
TRADITIONAL AND MEDICINAL USES
Karela has been used in various Asian traditional medicine
systems for a long time, as useful for preventing and
treating various diseases.
Fruits of Momordica charantia (karela) used in asthma,
burning sensation, colic, constipation, cough, diabetes,
fever (malaria), gout, helminthiases, inflammation,
leprosy, skin diseases, ulcer and wound. It has also been
shown to have hypoglycaemic properties (antidiabetic) in
animal as well as human studies. Juice of the Karela
leaves used to treat piles completely. Karela is used as a
blood purifier due to its bitter tonic properties. It can heal
boils and other blood related problems that show up on
the skin. Juice of karela is also beneficial in treating and
preventing the liver damage19, 20.
Leaves are used in treatment of menstrual troubles,
burning sensation, constipation, fever (malaria), colic,
infections, worms and parasites, as an emmenogogue,
measles, hepatitis and helminthiases12. In Guyana
traditional medicine, leaf tea is used for diabetes, to expel
intestinal gas, to promote menstruation, and as an
antiviral for measles, hepatitis, and feverish condition. It
is used topically for sores, wound, infections and
internally and externally for worms and parasites21.
Seeds are used in the treatment of ulcers, liver and
spleen problems, diabetes, intestinal parasites, high
cholesterol, and intestinal gas, heal wounds and
stomachache etc.15.
Roots are used in the treatment of syphilis, rheumatism,
boils, ulcer, septic swellings, opthelmia, and in Prolapsus
vagenae15, 19.
Karela juice helps to reduce the problem of Pyorrhea
(bleeding from the gums). Karela capsules and tinctures
are widely available in the United States for the
treatment of diabetes, viruses, colds flu, cancer, tumors,
high cholesterol and psoriasis2.
Ethnomedical Uses
In India, Momordica charantia Linn. (Karela) used by tribal
people for abortions, birth control, increasing milk flow,
menstrual disorders, vaginal discharge, constipation,
food, diabetes, hyperglycemia, jaundice, stones, kidney,
liver, fever (malaria), gout, eczema, fat loss,
hemorrhoids, hydrophobia, intestinal parasites, skin,
leprosy, pneumonia, psoriasis, rheumatism, scabies,
snakebite, vegetables, piles, tonic, anthelmintic,
purgative5.
PHARMACOLOGICAL ACTIVITY
Antioxidant Activity
Different parts of this plant have been used in the Indian
medicinal system for a number of ailments besides
diabetes. Antioxidant activity of extracted phenolic
compound from bitter melon has been reported by 22.
Antioxidant properties of Momordica charantia (Karela)
Seeds on Streptozotocin induced-diabetic rats has been
studied and results clearly suggest that seeds of
Momordica charantia (Karela) may effectively normalize
the impaired antioxidant status in streptozotocin
induced-diabetes23.
Antidiabetic Activity
Karela contains bitter chemicals like, charantin, vicine,
glycosides and karavilosides along with polypeptide-p a
plant insulin, which are hypoglycemic in action and
improve blood sugar levels by increasing glucose uptake
and glycogen synthesis in the liver, muscles and fat cells.
Volume 11, Issue 1, November – December 2011; Article-007 ISSN 0976 – 044X
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Reports indicate that they also improve insulin release
from pancreatic beta cells, and repair or promote new
growth of insulin-secreting beta cells. P-Insulin, a
polypeptide from the fruits and seeds rapidly decreased
and normalized the blood sugar level in rats. Bitter melon
contains another bioactive compound i.e. lectin that has
insulin like activity. The insulin-like bioactivity of lectin is
due to its linking together 2 insulin receptors. This lectin
lowers blood glucose concentrations by acting on
peripheral tissues and, similar to insulin's effects in the
brain, suppressing appetite. This lectin is a major
contributor to the hypoglycemic effect that develops
after eating Karela. Charantin extracted by alcohol, is a
potent hypoglycemic agent composed of mixed steroids
which is sometimes used in the treatment of diabetes to
lower the blood sugar levels12, 24-27.
Anticancerous and Antitumorous Activity
Bitter melon and its extract inhibit cancer and tumor
formation. A novel phytochemical in karela has clinically
demonstrated the ability to inhibit an enzyme named
guanylate cyclase. This enzyme is thought to be linked to
the pathogenesis and replication of not only psoriasis, but
leukemia and cancer as well28, 29. Other phytochemicals
that have been documented with cytotoxic activity are a
group of ribosome-inactivating proteins named alpha and
beta momorcharin, momordin and cucurbitacin B. In
1996, Lee-huang et al.30 have developed and patented
one more chemical compound “MAP-30”, which was able
to inhibit prostate tumor growth.
Momordin, another phytochemical has clinically
demonstrated anti cancerous activity against Hodgkin’s
lymphoma in vivo31 and several other in vivo studies have
shown the cytostatic and antitumor activity of the entire
plant of bitter melon. Further studies reported that a
water extract blocked the growth of rat prostate
carcinoma and a hot water extract of the entire plant
inhibited the development of the mammary tumors in
mice29. Numerous in vitro studies have also demonstrated
the anti-cancerous and anti- leukemic activity of bitter
melon against numerous cell lines including liver cancer,
human leukemia, melanoma and solid sarcomas28, 29.
Antimicrobial Activity
Sankaranarayanan and Jolly32 have clinically
demonstrated broad spectrum antimicrobial activity of
leaf extracts of Karela. They have reported the in vitro
antibacterial activities of water, ethanol, and methanol
leaf extracts of Karela against E. coli, Staphylococcus,
Pseudomonas, Salmonella, Streptobacillus and
Streptococcus; an extract of the entire plant have shown
anti-protozoal activity against Entamoeba histolytica. In
another study, a fruit extract of Karela has demonstrated
antibacterial activity against the stomach ulcer-causing
bacteria Helicobacter pylori 33.
Various plant species possessed antimicrobial activity
against different microorganisms34-36.
The antifungal potential of crude ethanolic extract of
kaffir lime, bitter cucumber and tobacco has been studied
by Thanaboripat et al., (2006)37 against Aspergillus flavus.
Jagessar et al., (2008)21 evaluated antibacterial and
antifungal activity of leaf extracts of Momordica charantia
(Karela) against Candida albicans, Staphylococcus aureus
and Escherichia coli and reported that the ethanol
extracts of Momordica charantia (Karela), can be used for
controlling E. coli and S. aureus induced diseases.
Antifertility Activity
Stepka et al., (1974)38 have demonstrated in vivo
antifertility effect of fruit and leaf of bitter melon in
female animals.
Antiviral Activity
Karela and its isolated phytochemicals, also has been
documented with in vitro antiviral activity against
numerous viruses including Epstein-Barr, herpes and HIV
viruses39, 40. In an in vivo study, a leaf extract
demonstrated the ability to increase resistance to viral
infections as well as to provide an immunostimulant
effect in humans and animals (increasing interferon
production and natural killer cell activity)41. Two proteins
known as alpha-and beta- momorcharin (which are
present in the seeds, fruit and leaves) have been reported
to inhibit the HIV virus in vitro39, 40). In one study, HIV-
infected cells treated with alpha- and beta-momocharin
showed a nearly complete loss of viral antigen while
healthy cells were largely unaffected42. In 1996 the
inventors of the chemical protein along MAP-30 filed a
U.S. patent, stating it was “useful for treating tumors and
HIV infections. In treating HIV infection, the protein is
administered alone or in conjunction with conventional
AIDS therapies43. Another clinical study showed that
MAP-30’s antiviral activity was also relative to the herpes
virus in vitro44.
Anti-Genotoxic Activity
Balboa and Lim-Sylianco, (1992)45 have reported that
Momordica charantia (Karela) decreases the genotoxic
activity of methylnitrosamine, methanesulfonate and
tetracycline, as shown by the decrease in chromosome
breakage.
Anti-Helmintic Activity
Momordica charantia (Karela) was found more effective
in the treatment of Ascaridia galli46. Ethanol (95%) extract
of fruit juice, was found active on Ascaridia galli, whereas,
hot water extract of seed at concentration of 1:50 was
active on Haemonchus contortus47.
Anti-Malarial Activity
Karela is traditionally regarded by Asians, as well as
Panamanians and Colombians, as useful plant for
preventing and treating malaria. Laboratory studies have
confirmed that various species of Karela have anti-
malarial activity. Leaves brewed in hot water to create a
tea to treat malaria48.
Volume 11, Issue 1, November – December 2011; Article-007 ISSN 0976 – 044X
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Antineoplastic Activity
Various preliminary studies, both in vitro and in vivo, have
found antineoplastic activity in crude extracts and
purified fractions of M. charantia5. In a skin
carcinogenesis in mice, aqueous extract of the fruit of M.
charantia provide protection against the development of
skin tumors and increases life expectancy. The extract
also reduced carcinogen-induced lipid peroxidation in the
liver, DNA damage in lymphocytes, and significantly
activated hepatic glutathione-S-transferase, glutathione-
peroxidase, and catalase, all of which had become
functionally depressed by exposure to the carcinogen
used in the study49. Many studies suggest a potentially
prophylactic role against carcinogenesis of water-soluble
constituents of bitter melon fruit, possibly mediated by
their modulatory effect on enzymes involved in the
biotransformation and detoxification of xenobiotic
substances49.
Antiulcerative and Immunomodulatory Activity
The traditional use of bitter melon for treating
gastrointestinal ulcers is recommended. Dried fruits
powder administered in filtered honey have significant
and dose-dependent activity against ethanol-induced
ulcerogenesis in rats. Various studies have found both
immunostimulating and immunosuppressive effects, due
to extracts and isolated constituents of bitter melon 16. It
is highly dependent on the type of extract or constituent,
its dosage and its route of administration.
CONCLUSION
Momordica charantia Linn. (Karela) is a potential herbal
plant which is used as vegetable and medicine. It is a
good source of various medicinally important
biochemicals like, triterpene, protein, steroid, alkaloid,
and phenolic which are responsible for its biological and
pharmacological activities including anti-diabetic, anti-
oxidant, anti-cancerous and anti-tumorous, anti-
microbial, anti-fertility, anti-viral, anti-helmintic, anti-
malarial, anti-ulcerative and immunomodulatory etc. on
the basis of all these properties Momordica charantia
Linn. (Karela) can be utilized as a good source of
nutritional, medicinal and pesticidal agent.
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