Distribution of the Chemical Constitutents in Different Position of Tea Shoot

Abstract

Difference of chemical constituents at different position in tea shoot of the first and second crop was investigated.
The content of total nitrogen, tannin and caffeine was decreased in leaves of lower position.
The total nitrogen content was rich in the first crop of green tea.
The tannin and caffeine were rich in the second crop of green tea.
Each content of free reducing sugar, flavonol, phosphate soluble pectin and total pectin substance was increased in the leaves of lower position.
The content of (-)-epigallocatechin was rich in leaves of upper position and in the second crop of green tea.
It was showed that in the leaves of upper position for the first plucking season were contained more theanine, glutamic acid, arginine, aspartic acid and serine but less in the second plucking season.
The content of phosphorus, potassium, mange-sium and zinc were rich in the leaves of upper position, while that of calcium, manganese and aluminium were rich in the leaves of lower position.