绿茶、花茶和乌龙茶对乌拉坦诱发小鼠肺癌的影响

三年来的研究结果表明,茶叶对乌拉坦诱发昆明种小鼠肺腺癌的发病率影响不大,但绿茶组的肿瘤指数Ⅰ和Ⅱ显著下降,乌龙茶与花茶组则否。雌性小鼠饮服隔日绿茶或隔日花茶二组发病率显著升高,而雄性小鼠饮服隔日花茶或隔日乌龙茶二组发病率却下降50%以上。以上结果表明,绿茶有一定的防癌效果,而隔日茶汤对不同性别动物在化学致癌作用中有促癌和抑癌的不同效果。

Effects of Green Tea,Jasmine Tea and Oolong Tea on Urethan-induced Lung Neoplasia in Mice

The effects of tea on the incidence of lung neoplasia,tumor index Ⅰ andⅡ of Kunming mice have been studied for three years.The repeated resultsshowed that the two indexes were significantly decreased in green tea group,but no significant changes in oolong tea group and jasmine tea group.As forthe effects of overnight tea infusion(over 24 hours),the incidences increasedremarkably in female with green tea group and jasmine tea group,butdecreased more than 50% in male with jasmine tea group and oolong tea group,the results show that green tea has a certain anticarcinogenesis effect,but the effects of overnight tea infusion vary with sex from inhibition to promotion.