Borassus flabellifer L. (Thốt nốt hay Thốt lốt) is grown in the Mekong Delta,
especially in An Giang, Kien Giang, and Dong Thap province. This study aimed to
investigate the antioxidant activity of Borassus flabellifer L. husk, a by-product that is
thrown away from the palmyra fruit through the use of various antioxidant activity tests
as DPPH, ABTS •+ , reducing power (RP), FRAP and phosphomolybdeum methods. The
tested results showed that the methanol extract of the palmyra fruit husk showed good
antioxidant activity in ATBS •+ , FRAP, Phosphomolybdeum methods with EC 50 (or OD 0,5 )
lower or equal to 100 μg/mL. This result was also consistent with the determination of
highly total flavonoid content in methanol extract of Borassus flabellifer L. husk. This
research opens up prospects in the use of Borassus flabellifer L. husk as the antioxidant
product .