茶叶清除羟自由基的能力与其高分子活性中心元素群子参数之间的关系

测定了小叶苦丁,普洱,大叶苦丁,云南大叶红茶等若干著名茶叶的羟自由基清除能力,并且利用电感耦合等离子体原子发射光谱仪测定了茶叶中V、Ti、Mo、Co、Cr、Cu、Fe、Mn、Ni、Sr和Zn这11种高分子活性中心元素的含量;用三参数群子统计方程分别确立了这些茶叶的群子参数,对这些茶叶的羟自由基清除率进行比较。研究发现,所有茶叶都有一定的羟自由基清除能力,清除率在50%~97%之间,其中铁观音,祁门红茶,白毫乌龙茶,黄山雀舌,洞庭碧螺春等的羟自由基清除能力较强,均在90%以上;茶叶中的羟自由基清除能力参数lnF与其高分子活性中心元素分布参数ln(k2r1/r2)之间有很好的线性关系,因此认为可以将高分子活性中心元素的分布参数作为近似判断抗氧化能力大小的依据之一,通过此参数可评价茶叶的抗氧化性。

The relationship between the distribution of the polymer active center elements and radical scavenging activity in tea

The radical scavenging activities of different tea samples have been determined, and the abundances of the 11 polymer active center elements(Sr,Mn,Mo,Zn,V, Cr,Fe,Co,Cu,Ni,and Ti) in the tea samples have also been determined by inductively coupled plasma atomic emission spectrometry(ICP).The sub-cluster parameters of these tea samples have been established by using a three parameter sub-cluster statistical theory equation.The different tea samples all showed radical scavenging activity,with activity levels v...