Nghiên cứu một số hoạt tính sinh học của hạt vải và hạt nhãn

The n-hexane, ethyl acetate and methanolic extracts from lychee (Litchi chinensis Lour.) and longan (Dimocarpus longan Sonn.) seed were evaluated antimicrobial, antioxidant, cytotoxic and tyrosinase inhibitory activities. The ethyl acetate and methanolic extracts exhibited better activites than the n-hexane extracts. The ethyl acetate extract of longan seed (DLE) showed the best antimicrobial activities, which inhibited four of seven tested microorgamism strain with MIC of
32 – 128 µg/mL. The  ethyl aceate of lychee seed (LCE) have the best DPPH radical scavenging activity with IC₅₀ of 15.74 ± 0.22 µg/mL. The ethyl acetate and methanolic extracts of longan seed (DLE and DLM) inhibited tyrosinase enzyme with 52.17 and 67.83 % at the dose of 500 µg/mL.

Keywords: Litchi chinensis, Dimocarpus longan, antimicrobial, antioxidant, tyrosinase.

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