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Vol 8, Issue 2, 2015 ISSN - 0974-2441
PHARMACOLOGICAL POTENTIALITY AND MEDICINAL USES OF IPOMOEA AQUATICA FORSK:
A REVIEW
CHITRAJIT MALAKAR1*, PINAK PANI NATH CHOUDHURY1,2
1Institutional Biotech Hub, S. S. College, Hailakandi, Assam, India. 2Department of Zoology, S. S. College, Hailakandi, Assam, India.
Email: chitrajitmalakar@gmail.com
Received: 23 January 2015; Revised and Accepted: 03 February 2015
ABSTRACT
It has been noteworthy from the ancient times; the human race is dependent on the use of traditional plant-based medicines as well as polyherbal
preparations. And from the last few decades several research works are carried out which confirms the potentiality of these natural sources as a good
source of medications. Ipomoea aquatica was among such plant having good nutraceutical applications and is commonly consumed as a vegetable and
is commonly found in tropical Asia, India, Africa and Australia, etc. The plant is considered to be a good source of vitamins, minerals, plant proteins,
fibers, etc. as well as the plant is supposed to have tremendous pharmacological importance. The present review aims to present a brief overview of
the medicinal use as well pharmacological value of the plant.
Keywords: Pharmacological activity, Phytochemistry, Potential uses, Compounds.
INTRODUCTION
The plant Ipomoea aquatica is a common trailing vine with milky sap
belongs to the family Convolvulaceae. The plant is commonly known
as aquatica morning glory, Chinese water spinach, Kangkong, morning
glory, swamp cabbage, swamp morning glory, water convolvulus, water
spinach, etc. [1-6]. The plant is considered to have a wide distribution
and grows in moist soils as well as the side-lines of fresh water, ditches,
lakes, ponds, marshes and wet rice field. The plant is grown in the wild
and is usually grows all-round the year as well as cultivated throughout
South East Asia and is generally consumed as a vegetable in different
regions of the world. In most part of the tropical Asia, I. aquatica is a
common food consumed by all social groups, and have different ways
people consume it [7]. In the rural area of India, it is generally used as
green leafy vegetable [8].
ETHNOBOTANICAL RELEVANCE
Since from the earlier time, it is believed that people from all over
the world is used to cure their disease with the help of traditional
medicines, which is mainly plant-based herbal preparation. About 80%
of total world’s population believed to use the traditional medicine [9].
The present review is based on a trailing vine namely I. aquatica and is
reflected in the new era as a potent medicinal plant. From the traditional
knowledge, it had been reported that the plant recommended to use as
a laxative in piles patients and other problems related to sleeplessness
and headache [10]. In Ayurveda (the traditional medicine) it is reported
that oral administration of I. aquatica leaves leads to cure ailments such
as jaundice, nervous debility. The plant is used in the treatment of liver
diseases [11] constipations [12] diabetes [13,14] abscesses, mental
illness in Tanzania and intestinal problems in Somalia [12] nose bleeds
and high blood pressure [15,16] anthelmintic [17,18] central nervous
system depression (CNS) depressant, antiepileptic, hypolipidemic
effects [19], antimicrobial and anti-inflammatory [20] as well as
nootropic effect on rat hippocampus. The dried juice also possess a
potent purgative property [18,21,22]. The plant is also effective in
the inhibition of prostaglandin synthesis [23]. The plant extract also
possess antimicrobial activity against the microbes such as Escherichia
coli, Pseudomonas aeruginosa and Bacillus subtilis [24]. From the above
mentioned investigation of the plant, it is revealed that I. aquatica
could be really an effective natural herb having good nutraceutical
applications as well as to cure many fatal diseases. However, many
beneficial use of this herb remain unexposed therefore required a
proper attention in the medicinal field.
Phytochemistry
The basic preliminary phytochemical screening of the plant I. aquatica
reveals the fact the plant contains various phytochemicals such as
vitamins, flavonoids, amino acids, alkaloids, lipids, steroids, saponin,
phenols, reducing sugar, tannins, β-carotene, glycosides, and minerals,
etc. The plant is found to contain vitamins such as A, B1, B2, B6, B12,
C, E, K [25] and “U” (S-methyl-methionine), and is reported to treat
the ailments like gastric and intestinal disorders [26]. The plant also
supposed to contains aliphatic pyrrolidine amides, carotenoids,
hentriacontane, β-sitosterol and its glycosides, prostaglandin,
leukotriene, N-trans - and N-cis-feruloyltyramines [5,27-31]. Moreover
certain amino acids like aspartic acid, threonine, serine, glutamic
acid, proline, glycine, alanine, leucine, tyrosine, lysine, histidine, and
arginine [8] and sugars like glucose, fructose, sucrose [6], and starch [1];
and organic acids such as malic acid, citric acid, and oxalic acid [6]
and minerals like sodium, potassium, calcium, iron, magnesium, and
zinc were detected in I. aquatica [32]. Polyphenols such as myricetin,
quercetin, luteolin, apigenin, and kaempferol were detected in
I. aquatica [33-35]. However, several studies reveals the presence of 12
pigments [28] and various types of chlorophylls, carotenoids viz. lutein,
anthraxanthin, flavoxanthin, auroxanthin, luteoxanthin, neoxanthin,
B-carotene, violoxanthin, cryptoxanthin, neoxanthin A and neoxanthin
B and polyphenolsviz quercetin 3’-methyl ether, quercetin 4’-methyl
ether and anthocyanins [31,34] (Table 1).
PHARMACOLOGICAL POTENTIALITY OF THE PLANT
From the traditional point of view such as Ayurveda and homeopathy,
leaves extracts of I. aquatica are directed orally to cure antioxidant
related ailments [21]. It was reported that the plant possess excellent
antioxidant activity because of the presence of vitamin C and
phenolic compounds [47,48] and contain a high level of polyphenolic
compounds [44,49-51]. It was reported that 1-diphenyl-2-
picrylhydrazyl (DPPH) study of ethanolic extract of I. aquatica leaves
shows IC50 value of 0.387 mg/mL whereas ABTS method displays IC50
value of 0.394 mg/ml [47] whereas ethanol extract of stem shows
highest radical-scavenging activity as compared to water extract of
leaf and stem, but methanol extract IA showed outstanding DPPH free
radical scavenging activity (85%), which is very close to the synthetic
antioxidant butylhydroxyanisole (95%) [52]. In another study
Review Article
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Malakar and Choudhury
61
flavonoid glycoside viz. 7-O-β-D-glucopyranosyl-dihydroquercetin-3-O-
α-D glucopyranoside (DHQG) isolated from the leaf extract of I. aquatica
shows compelling antioxidant activity [40]. Moreover, methanolic and
aqueous extracts shows a profound anti-inflammatory activity against
carrageenan-induced rat paw edema model and shows its effect in a dose
dependent manner [20]. In Sri Lanka, the plant is used as a vegetable
and thought to have insulin like activity [53]. The plant is also reported
to possess hypoglycemic effects [13,14] and suggests that plant extracts
inhibit the absorption of glucose from the intestine [54-57]. However,
the exact mechanism by which the plant extract is considered to anti-
diabetic is still not clear but it is assumed that the hypoglycemic effect
is due to increase the insulin secretion or peripheral glucose uptake
or decrease in gluconeogenesis or inhibit the release of hormones
such as cortisol, glucagon, and growth hormone, etc. Simultaneously
the plant also possesses cytotoxic and anti-proliferative activity. In
a study it is found that the water extract of the stem have the highest
anti-proliferative activity as compared to leaf extract [52]. In another
study it was stated that crude methanolic extract , its column fraction
and purified bioactive compound i.e. 7-O-ß-D-glucopyranosyl-DHQG
isolated from the plant I. aquatica shows a profound cytotoxic activity
against Hep-2 and A-549 cell lines, respectively [39], whereas MWE
extract of plant acts as a potent anti-mutagen against Trp-P2-induced
mutagenicity and shows a detectable anti-tumor activity in the mouse
myeloma P388 cell line [58]. Furthermore it is reported that the MIAF
and AIAF shows a maximum zone of inhibition against the microbes,
and hence it is confirmed that the leaf extract of I. aquatica possess a
characteristic antimicrobial property [20], whereas ethanolic extract of
I. aquatica possess a significant anti-ulcer activity when administered
to an aspirin-induced ulcer model in a dose dependent manner [51].
In addition to this the plant also shows nootropic activity in neonatal
and young adult age groups of rat for 30 days, which causes a profound
increase in the acetylcholine level in the rat hippocampus as compared
to the control groups [47], Next to this the plant displays potent CNS
depressant and antiepileptic activity and reported that continuation
administration of methanol extract (200 and 400 mg/kg) causes
a notable increases in onset to clonic and tonic convulsions and at
400 mg/kg, reflects an ample protection against seizures-induced by
strychnine and picrotoxin but not with pentylenetetrazole in a dose
dependent manner [19]. It was reported the oral administration of
methanol:acetone extract of leaves of I. aquatica at a dose of 200 and
400 mg/kg exhibited anxiolytic activity in elevated plus maze, light:
Dark apparatus, and hole board apparatus models there by increasing
the time spent [48]. Beside this it was reported that oral administration
of methanol leaf extract at a dose of 200 and 400 mg/kg for 30 days
Table 1: Some major compounds from the plant I. aquatica
Compound IUPAC Name Activity
Nortropane alkaloids
Calystegines B1
(1R,2S,3R,5S,6R)-8-azabicyclo[3.2.1]
octane-1,2,3,6-tetraol
The compound shows a potent
inhibitory activity against rat
lysosomal β-glucosidase [36,37]
N‑cis-Feruloyltyramine (phenolic compound) (Z)-3-(4-hydroxy-3-methoxyphenyl)-
N-(4-hydroxyphenethyl) acrylamide
Both the compounds are isolated
from the toots of the plant and is
considered to be potent inhibitors
of prostaglandin synthesis. [23,38]
N‑trans-feruloyltyramine (phenolic compound) (E)-3-(4-hydroxy-3-methoxyphenyl)-
N-(4-hydroxyphenethyl) acrylamide
3α,7β-O-D-di glycopyranosyl-dihydroquercetin 2-(3,4-dihydroxyphenyl)-5-hydroxy-3-
(((2R,3S,4R,5R,6S)-3,4,5-trihydroxy-6-
(hydroxymethyl) tetrahydro-2H-pyran-2-yl)
oxy)-7-(((2S,3R,5S,6R)-3,4,5-trihydroxy-6-
(hydroxymethyl) tetrahydro-2H-pyran-2-yl)
oxy) chroman-4-one
The compound found to be
cytotoxic against normal, as well
as cancer cell lines viz. Hep-2 and
A-549 [39,40]
Isochlorogenic acid a, b and c (phenolic compounds)
Isochlorogenic acid a=R1 and R3=Caffeoyl; R2=R4=R5=H
Isochlorogenic acid b=R1 and R2=Caffeoyl; R3=R4=R5=H
Isochlorogenic acid c=R2 and R3=Caffeoyl; R1=R4=R5=H
Isochlorogenic acid a, b and c is found not only in I. aquatica but also observed in
other species of the genus Ipomoea viz. I. batatas, I. pres‑caprae having collagenase
inhibitory activity [41], antioxidant activity [42], anti HIV activity [43,44].
Isochlorogenic acid an alone shows potent antifungal activity[45] and
anti-spasmodic activity [46]
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Malakar and Choudhury
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in Swiss Albino rats significantly reduced the concentration of
plasma total cholesterol, total lipid, free fatty acid, phospholipid, and
triglycerides as well as the liver, kidney and heart total cholesterol [59]
as well it was mentioned in that oral administration of methanol extract
of whole plant at illustrates a good diuretic activity in a dose dependent
manner [60]. It was reported that the plant extract acts as an antidote
against scorpion venom with a great efficacy [61].
CONCLUSION
The plant I. aquatica can be considered as an effective natural herb for
the treatment of various ailments and having numerous health benefits
because of the presence of rich source of vitamins, minerals, flavonoids,
alkaloids and many other secondary metabolites. Over the last few
decades, a few works had been carried out on this plant and is found
to be a promising natural herb in the treatment of various ailments in
vitro. Since the plant is considered to be an effective herb therefore it
may be possible that many un-explored pharmacological application of
this herb need to be exposed and can be studied both in vitro and in
vivo as well as study the mechanism of its action in the system of an
organism.
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