Antioxidant and Anti-browning Activities of Ethanol Extract from Lotus Seed Skin

The goal of the present work was to evaluate the antioxidant and anti-browning activities of ethanol extract from lotus seed skin.The ABTS+ radical scavenging activity,anti-tyrosinase activity and anti-browning effect as well as the contents of total phenols and total flavonoids of the extract were determined.The results revealed that the ethanol extract contained(233.63 ± 10.16) mg/g total phenols and(166.02 ± 7.31) mg/g total flavonoids.It also showed a strong antioxidant activity against ABTS free radicals with IC50 of(1.385 ± 0.210) mg/mL.In tyrosinase inhibitory assay,the measured IC50 values were(1.665 ± 0.137) mg/mL for monophenolase and(3.777 ± 0.294) mg/mL for diphenolase,respectively.This extract had a significant anti-browning effect on fresh-cut apple slices as demonstrated by measuring changes in L*,a*and b* values,and the best efficacy was observed when combined with 0.5 g/100 mL ascorbic acid.