云南普洱地区大叶种茶酚氨比研究

Analysis of Phenolic/Amino Acids in Large-leaf Species Tea from Yunnan Pu'er Area

使用国标法对普洱地区61个大叶种茶叶样品茶多酚质量分数及游离氨基酸总量进行测定,计算其酚氨比,并统计不同类型茶叶酚氨比差异.结果表明,普洱地区61个茶叶样品酚氨比较好,其均值为(8.70±7.44).普洱地区茶叶酚氨比在不同制茶品种、不同芽叶级别中均无统计学意义.茶多酚质量分数是区分绿茶与其他茶种的良好指标,氨基酸总量是区分普洱熟茶与其他茶种的辅助指标.氨基酸总量在不同芽叶等级中出现显著性差异,但尚不能区分黄片茶.

Phenolic mass fraction and total free amino acids of 61 large-leaf species tea samples from Pu＇er area were determined by national Standard methods to calculate the ratios for phenolic/ammonia and statistically analyze the diversity of the different tea varieties. The Statistical results showed that the 61 tea products had a good phenolic/amino acids ratio （8.70 ± 7 .4 4 ） . None statistical difference was shown in phenol/ammonia ratio between either different tea varieties, or leaves grades. Tea polyphenol mass fraction is good for distinguishing green tea from others;while amino acids is assistant indicator to discriminate between pu＇er ripe tea and others. Amino acids showed the significant differences in different leaf grade, however,it still can＇t identify porn tea from others.