早竹和高节竹叶化学成分的初步测定

A Preliminary Study of Chemical Composition in Leaves of Phyllostachys praecox and Ph.prominens.

早竹和高节竹叶的水提取物中均含有黄酮、糖类、氨基酸和蒽醌类等成分。用硫酸－蒽酮法测定水溶性糖的含量表明，冷水提取物中早竹叶平均为２．４６％，高节竹叶平均为２．９９％；热水提取物中早竹叶平均为７．１０％，高节竹叶平均为６．９２％。用凯氏定氮法测定含氮量和蛋白质含量，平均分别为早竹２．７７％和１７．３７％，高节竹２．５９％和１６．１２％。２种竹叶中谷氨酸的含量最高。

The results showed that there were flavonoid,glucide,amino acids and anthraquinone in the extracts from leaves of Phyllostachys praecox and Ph.prominens.By anthranonesulphuric acid method,the contents of water soluble sugars in cool water extracts averaged 2 64% in Phyllostachys praecox and 2 99% in Ph prominens,while in hot water extracts,the contents averaged 7 10% and 6.92% respectively.The nitrogen content and protein content measured by Kjeldahl method averaged 2 77% and 17 37% in Ph.praecox leaves,and 2 59% and 16 12% in Ph.prominens leaves.The analysis of amino acids indicated that the content of glutamic acid in two kinds of bamboo leaves was the highest.