The air-dried fruit hull of Phyllanthus emblica L. was extracted with 95% ethanol, and then the extract was
partitioned by diethyl ether and ethyl acetate (EA).
The EA fraction was then subjected to separation and purification using silica gel and Sephadex LH-20 column chromatography repeatedly to obtain five hydrolysable tannins. They were identified as mucic acid 1,4-lactone 3-o-gallate (C1), isocorilagin (C2),chebulanin (C3), chebulagic acid (C4) and isomallotusinin (C5) using mass spectrometry and nuclear
magnetic resonance (NMR) spectrometry.
Isomallotusinin and chebulanin were identified from emblica dried fruit hull for the first time, and isomallotusinin was the first time identified from Phyllanthus. Furthermore, the antioxidant abilities of these hydrolysable tannins were investigated using DPPH and ABTS+ radical scavenging systems. All hydrolysable tannins showed strong DPPH and ABTS+ radical
scavenging activities. Isomallotusinin and chebulagic acid exhibited the highest antioxidant activity compared
to other purified compounds tested.2
The air-dried fruit hull of Phyllanthus emblica L. was extracted with 95% ethanol, and then the extract waspartitioned by diethyl ether and ethyl acetate (EA). The EA fraction was then subjected to separation and purification using silica gel and Sephadex LH-20 column chromatography repeatedly to obtain five hydrolysable tannins. They were identified as mucic acid 1,4-lactone 3-o-gallate (C1), isocorilagin (C2),chebulanin (C3), chebulagic acid (C4) and isomallotusinin (C5) using mass spectrometry and nuclearmagnetic resonance (NMR) spectrometry. Isomallotusinin and chebulanin were identified from emblica dried fruit hull for the first time, and isomallotusinin was the first time identified from Phyllanthus. Furthermore, the antioxidant abilities of these hydrolysable tannins were investigated using DPPH and ABTS+ radical scavenging systems. All hydrolysable tannins showed strong DPPH and ABTS+ radicalscavenging activities. Isomallotusinin and chebulagic acid exhibited the highest antioxidant activity comparedto other purified compounds tested.2
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