Some factors that affect the free radical-scavenging activety of two tea extracts were studied in vitro.It was found that concentration of tea extract or heating tea extract or treating with activated carbon and diatomite all had obvious effect on the scavenging activety of green tea extract,but heating or treating with diaomite had less effect on the scavenging activity of black tea extract.Ascorbic acid,for having synergic effect with tea extracts,could enhance the scavenging activity of tea extracts markedly,and the contrary was cupric ion.Reducing sugars such as fructose and glucose also had some syncrgic effect to tea extracts.

完成机构：NortheastAgriculturalUniversity,Harbin150030PRC

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