Abstract:

In order to know and use preferably big plant tea in Xishuangbanna and provide the theoretical basis of scientific in the big plant tea research. In the spring, summer and autumn, the biochemical composition of big plant tea (crude green tea) of seven areas in Xishuangbanna of Yunnan was determined by spectrophotometer and high performance liquid chromatographic method. Its quality factor was assessed by the method of organoleptic evaluation. The results showed that contain substances of big plant tea of seven areas were very rich in the spring, summer and autumn; in the same season, water extracts, polyphenols, soluble sugar content had significant differences. HPLC analysis found that the composition of amino acids and catechin had no significant differences, the theanine accounted for 50% of the total, esterified catechins accounted for more than 60% of the total. The amino acids and soluble sugar content of Sanmai big plant tea was higher. Tea polyphenols and catechins of summer and autumn tea was higher than spring tea; amino acids of spring tea was higher than autumn and summer tea; soluble sugar content and caffeine of spring tea was higher than summer and autumn tea. The organoleptic evaluation showed that the quality of big plant tea (crude green tea) of seven areas were well in the liquid color, aroma, flavour and infused leaves.