Piyagaw is a small tree growing 3 to 12
meters high. Leaves are abruptly pinnate, with pairs of leaflets which are elliptic or obovate, 8 to 18 centimeters long, 4 to 8 centimeters wide, with a pointed
base and rounded tip. Flowers are small and white, 4-parted, borne on short
terminal or axillary (upper) panicles. Fruit is spherical, 9 to 12 centimeters in
diameter, with 6 to 12 seeds. Pericarp is hard and fibrous, splitting
into 4 valves. Seeds are angled, with a spongy integument.
X. moluccensis is similar to Xylocarpus granatum (piyagaw). X. granatum has larger fruit, smooth, patchy bark, buttresses and plant-like aerial roots. X. moluccensis has a smaller fruit, with conical pneumatophores. (1)
- Throughout the Philippines
in mangrove swamps, bordering tidal streams.
- Also occurs in India and Ceylon through Malaya and New Caledonia.
- Solid fat, 40-60%; tannin.
- The seeds, fruits and stems yield a large number of limonoids.
- Phytochemical exam of fruits of X. granatum isolated five new protolimonoids, protoxylocarpins A-E, and two new limonoids, xylocarpins J and K, together with xyloccensis M and Y.
- Seeds yielded 13 compounds: a new one, indiangranatumin A, together with known compounds swietemahonolide, febrifugin ,khayasin T, febrifugin A , gedunin, isolariciresinol, phaseic acid, aromadendrin, 4-hydroxy cinnamic acid, 4-hydroxybenzoic acid, 4-hydroxyphenylacetic acid,and xylogranatinin. (9)
- Seed kernels yielded three new phragmalin limonoids, moluccensins H-J.
- Methanolic extract yielded carbohydrates, saponins, tannins, and flavonoids. Alkaloids and glycosides were not found in the extract.
- Study of seed yielded a new glyceride, 1,3-di-(16'-acetoxy-palmitoyl)-glycerol ( 1), and a known ceramide, (2 S,3 S,4 R,8 E)-2-[(2' R)-hydroxypalmitoylamino]-8-tetracosene-1,3,4-triol ( 2). (18)
- Study of stem bark yielded a new flavonol derivative dihydrocaffeic acid-(3→8)-epicatechin together with two known derivatives, (+)-catechin and catechin-(4β→8)-catechin. (see study below) (19)
- Study for chemical constituents of fruit yielded ten compounds identified as: spicatin (1), xyloccensin K(2), 6-acetoxycedrodorin (3), aurantiamide acetate (4), (+)-catechin (5), alpha-tocopherol (6), abscisic acid (7), daucosterol (8), 4-hydroxybenzoic acid (9) and ethyl 3,4-dihydroxybenzoate (10). (20)
- Phytochemical screening yielded major constituents viz., alkaloids, steroids, tannins, triterpenes, limonoids, flavonoids, saponins. Various compounds isolated with known biologic activities were: 4-hydroxybenzoic acid, ethyl 3,4- dihydroxybenzoate, xylogranatinin, granatoin, N-Methyl indersine, β-Sitosterol, β -Sitosterol β -D-glucoside, Methyl angolensate, Gedunin and 1α-hydroxy-1,2-dihydrogedu., xyloccensin O, xyloccensin P , xyloccensin Q, Catechin, epicatechin, procyanidins of the B, trimer and pentamer xyloccensins O-P, xyloccensins Q-V, Xyloccensin L, xyloccensin K, xyloccensin IJ. Chelerythrine and dihydrochelerythrine. (22)
- Fruit yielded two new mexicanolides: 3-deacetyl xyloccensin M and 3-deacetyl xyloccensin N. (25)
- Study of twigs and leaves isolated eight new tetratriterpenoids viz., 9-epixylogranatin A (1), Xylogranatumin A (2), 6-O-acetyl xylocarpin D (3), 14-Hydroxy-14,15-dihydrogranatumin C (4), 30-O-tigloylhainangranatumin J (5), 9-O-methyl xylogranatin R (6), 30-O-acetylhainangranatumin E (7), 1,2-Dihydro-3α-hydroxy-turranolide (8), together with four related known compounds (9-12). (see study below)
- Study of fruits for fatty acids yielded eleven kinds of fatty acids, 5 were unsaturated, total amount was 81.97%, with the highest content composed of 9,12,15-octadecatrienoic acid. (29)
Bitter, astringent, anti-diarrhetic.
- Bark and root considered astringent.
- Studies have shown antimicrobial, antioxidant, cytotoxic, antimalarial, antidiarrheal, antihyperglycemic, hypolipidemic, cardiotonic, tyrosinase inhibitory, antifilarial, antitumor, neuroprotective properties.
Fruits, bark, leaves, seeds.
- Fruits or seeds , powdered or decoction, are used for diarrhea.
- In Tonga, the bark is used for candidiasis, scabies, baby rash, stomach
- In Malaya, used for cholera, colic diarrhea, and other abdominal affections.
- In Fiji, bark used for headaches, fatigue, candidiasis (leaves and bark),
joint pains, chest pains and buccal pains.
- In East India and Sri Lanka, seed paste used for breast tumors. Roots used as remedy for cholera and dysentery. (15)
- Also used for replapsing
- In Bangladesh, used for gastrointestinal disturbances such as cholera, dysentery, diarrhea; also for fever.
- Wood: Used for boat building, furniture, and a fuel bark.
- Tanning: Bark used for tanning.
- Illuminant: Seed oil used for illumination
• Antimicrobial: Study of crude
extract of X. granatum showed significant antimicrobial activity against
S epidermis, S aureus, Shigella boydii and Proteus spp and moderate
activity against E coli and S pyogenes. (1)
• Antioxidant / Flavonols: Methanol extract showed to be rich in flavan-3-ols and procyanidins. It exhibited excellent DPPH radical scavenging and 15-lipoxygenase inhibiting activities attributed to the high content of catechins and procyanidins.
• Phragmalins: Study isolated three new polyhydroxylated phragmalins, named xyloccensins Y, Z1 and Z2 from the fruit of Xylocarpus granatum, with eight known compounds. (5)
• Antidiarrheal / Bark: Study of methanol extract of XG bark for in experimental diarrhea induced by castor oil and magnesium sulfate in mice showed significant dose-dependent antidiarrheal activity and supports its use in traditional herbal medicine. (6)
• Antibacterial: Study of methanol extract demonstrated antibacterial activity against gram positive bacteria Staphylococcus aureus and Bacillus subtilis and gram negative bacteria Proteus vulgaris. (12)
• Antibacterial / Bark: Antimicrobial screening showed the crude ethanol extract and partial fraction of barks showed significant antimicrobial activity against Staphylococcus epidermis, S. aureus, Shigella boydii and Proteus spp. and moderate activity against E. coli, Streptococcus pyogenes. (13)
• Antimalarial / Gedunin and Xyloccensin-I: Study evaluated the antimalarial activity of Xylocarpus granatum fruits and their active constituents. A chloroform fraction showed promising anti-malarial activity in an in vitro model of Plasmodium falcifarum. Gedunin and xyloccensin-I, pure compounds isolated from the active fraction, showed activity equivalent to the parent active fraction in vitro model. (14)
• Antidiarrheal / Antimicrobial / Bark and Leaves: An ethanolic extract of bark and leaf showed antidiarrheal activity in castor oil induced diarrheal rats in a dose-dependent manner. The bark extract showed gram positive antibacterial activity and anti-yeast activity. (15)
• Cardiotonic / Bark: Study evaluated the cardiotonic activity of an alcoholic bark extract of Xylocarpus granatum. Extract showed dose dependent positive ionotropic effect on normal and hypodynamic frog heart. There was also dose dependent inhibition of Na, K ATPase activity. The cardiotonic activity is similar to the mechanism of digoxin (inhibition of Na, K ATPase enzyme activity). (16)
• Antihyperglycemic/ Antidyslipidemic / Fruits: Study of ethyl acetate fraction of fruits of X. granatum and X. moluccensis showed both are effective in improving glucose tolerance, decreasing blood glucose, serum cholesterol and triglycerides in STZ-induced diabetic rats and dyslipidemic hamsters. There was also increase glucose uptake by L6 skeletal muscle cells. (17)
• Antioxidant / Flavanol / Stem Bark: Study of stem bark yielded a new flavanol derivative dihydrocaffeic acid-(3→8)-epicatechin together with two known derivatives, (+)-catechin and catechin-(4β→8)-catechin were isolated from the stem bark. Catechin-(4β→8)-catechin showed the highest DPPH radical scavenging activity with IC50 of 4.5 µg/mL. (19)
• Tyrosinase Inhibitory and Antioxidant Activity / Seed Kernel: Study evaluated various extracts of seed kermel for tyrosinase inhibitory activity. A methanol extract showed best activity on inhibition of monophenolase and diphenolase activity. The extract also showed antioxidant activity with IC50 of 10.61 ± 2.1µg/mL. Results showed the seed kernel has potential as tyrosinase inhibitor and antioxidant agent. (21)
• Antifilarial / Genudin and Photogedunin: Study in experimental rodent host evaluating the antifilarial activity of X. granatum showed the fruit extract contains promising in vitro and in vivo antifilarial activity against human lymphatic filarial parasite B. malayi. Results showed antifilarial activity primarily localized in the ethyl acetate soluble fraction with IC50 of 8.5 and 6.9 µg/ml in adult worms and microfilaria, respectively. The activity was attributed to two pure compounds gedunin and photogedunin. (23)
• Xylocarpin H / Limonoid / Antidepressant: Study of Xylocarpin H, a limonoids from X. granatum, showed antidepressant-like effects in mouse forced swimming and tail suspension tests. The antidepressant activity in mouse behavioral models of depression was likely through inhibition of HPA axis systems. Results suggest a potential as novel antidepressant candidate for treatment of depression and related disorders. (24)
• Tetratriterpenoids / Neuroprotectice: Study of twigs and leaves isolated eight new tetratriterpenoids (1-8), together with four related known compounds (9-12). Compounds 11 and 12 displayed moderate effects against h2)2-induced neurotoxicity in PC12 cells. (see constituents above) (26)
• Xylogranatins / Antifeedants / Seeds: Study of seeds yielded 13 limonoids, xylogranatins F-R (1-13). The structure of the compounds suggest a new biogenetic pathway to tetranortriterpenoids. Xylogranatins F, G, and R exhibited marked antifeedant activity against the third larvae of Mythimma separata. The most potent was xylogranatin G. (27)
• Xylogranin B / Wnt Signal Inhibitory Limonoid / Cytotoxicity / Seeds: Study isolated xylogranin B (compound 2) from X. granatum leaves. Compound 2 inhibited TCF/ß-catenin transcriptional activity (IC50 48.9 nµ) and exhibited strong cytotoxicity against colon cancer cell lines. Compound 2 significantly decreased ß-catenin levels in nuclei which in Wnt signal inhibitory effects. (28)