富硒茶叶中硒的溶出特征  

Dissolution Characteristics of Selenium in Selenium-Enriched Tea Leaves

作　　者：陈英贺 缪德仁 肖涵 CHEN Yinghe;MIAO Deren;XIAO Han(School of Chemistry and Chemical Engineering,Kunming University,Kunming,Yunnan,China 650214)

机构地区：[1]昆明学院化学化工学院,云南昆明650214

出　　处：《昆明学院学报》2024年第3期51-56,共6页Journal of Kunming University

基　　金：国家自然科学基金项目(31960057,32360375)。

摘　　要：采用纯水浸泡方法研究了富硒茶叶中硒的可浸出特征,电热板消解-ICP-MS对不同浸泡温度及浸泡时间下富硒茶(大叶种绿茶、大叶种黄茶和小叶种绿茶)中硒的溶出特性进行了研究.结果表明,大叶种绿茶、大叶种黄茶和小叶种绿茶中硒的溶出率分别为:13.26%、17.90%和17.10%,溶出率较低,严重制约着硒从茶产品到人体的传递效率;富硒茶叶中硒的溶出率随溶出时间的增加和浸泡温度的提升而增加,在0~30 min内,溶出率随着时间增长持续上升,上升速度最快的阶段为0~5 min,其后逐渐趋缓,当浸提时间超过60 min后,浸出接近平衡状态;对大叶种茶而言,溶出温度相较于溶出时间的影响更显著,小叶种茶则与之相反;当浸泡温度高于25℃时,在120 min内,富硒小叶种茶叶中硒的溶出率随溶出时间呈对数形式增加,相关性和拟合度优于大叶种茶叶.The leachable characteristics of selenium in selenium-enriched tea leaves were investigated by pure water immersion method,and the dissolution characteristics of Se in selenium-enriched teas(large-leafed green tea,large-leafed yellow tea and small-leafed green tea)were investigated by electrothermal plate ablation-ICP-MS with different immersion temperatures and immersion times,with a view to providing a basis for the nutritional value of selenium-enriched teas for human beings.The results showed that the dissolution rates of Se in large-leaf green tea,large-leaf yellow tea and small-leaf green tea were 13.26%,17.90%and 17.10%,respectively,and the dissolution rates were low,which seriously restricted the efficiency of selenium transfer from tea products to the human body;the dissolution rate of Se in selenium-enriched tea increased gradually with the increase of the time of dissolution and the elevation of the infusion temperature,and the rate of dissolution in the range of 0-30 min increased continuously with the growth of time,and the fastest rate of rise was in the range of 0-30 min and the rate of increase was in the range of 0-30 min and the rate of dissolution in the range of 0-30 min.continued to rise,the fastest rate of increase in the stage of 0-5 min,followed by a gradual slowdown,when the extraction time of more than 60min,the leaching is close to the equilibrium state;for the large-leafed species of tea,the dissolution temperature is more significant in comparison with the effect of the dissolution time,and the small-leafed species of tea is the opposite of it;when the steeping temperature is higher than 25℃,within 120 min,the dissolution rate of selenium in selenium-enriched small-leafed species of tea leaves with the dissolution time showed a increased logarithmically,and the correlation and fit were better than that of the large-leafed tea leaves.

关 键 词：硒 富硒茶叶 溶出特征 大叶种茶叶 

分 类 号：S571.1[农业科学—茶叶生产加工]