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随着茶叶多种利用的深化,从茶叶中提取的各种生化成分制品日渐增多,而制品纯度的检测工作也随之复杂化,例如,对茶多酚制品纯度测定的准确度问题,特别是采用国标法测定成品中茶多酚的含量时,就出现过含量测定值超过百分之百的情况。本文拟从国标法的制定原理进行分析,对目前茶叶提取物中茶多酚含量的测定值问题作一探讨。 一、国标法的由来 GB8313—87茶多酚的测定方法,是1972～1982年间在研究茶叶理化审评时通过上万次的测试结果确定的,该国标书明:“本标准适用于茶叶中茶多酚含量的测定”,很明显,该方法只适用于测定茶叶,而不是茶多酚制品。 欲知茶多酚含量测定方法之由来,首先要说明,植物中的单宁(又名鞣质)分为两大类,一类是以中国五棓子单宁为代表的水解单宁;另一类是以儿茶素为代
With the deepening of various utilization of tea, the various biochemical components extracted from tea are increasing day by day, and the purity of the product is also complicated. For example, the accuracy of measuring the purity of tea polyphenol products, especially Using the national standard method to determine the content of tea polyphenols in the finished product, the content of the measured value appeared over one hundred percent. This article intends to analyze the principle of the national standard method of formulation, the current value of tea polyphenols in the determination of the value of the problem to make a discussion. First, the origin of the national standard GB8313-87 tea polyphenols determination method is 1972 to 1982 in the study of physical and chemical evaluation of tea through thousands of times the test results to determine the national tender: “This standard applies to tea Determination of tea polyphenols content ”, it is clear that this method is only suitable for the determination of tea, not tea polyphenols products. To know the origin of the determination of the content of tea polyphenols, we must first note that tannins (also known as tannins) are divided into two categories, one is the Chinese tannic acid Tannin represented by the hydrolysis of tannin; the other One is based on catechins