Comparative study on the quality of Pu-erh crude teas from different regions in Yunnan Province
The main chemical composition of theanine,amino acids,the water-soluble carbohydrates,caffeine and other major chemical constituents in 20 Pu-erh crude teas from Yunnan was studied;Catechin were separated by high performance liquid chromatography(HPLC),and Pu-erh crude teas in different origins were polymerized through the major components.The results showed that there are significant different in chemical composition of Pu-erh crude teas from different origins,and the quality are similar from the same region.This investigation can supply fundamental data for processing and quality-assessment of pu-erh crude tea.