Study on the Law of the Variation in the Content of Total Flavone in Siraitia grosvenorii Leaves in Different Growth Periods

The content of total flavone in Siraitia grosvenorii leaves with different growth periods was determined by HPLC,and the law of the variation in the contents of quercetin,kaempferol and flavone glycoside was analysed.The result shows that the content of quercetin is zero before May,increases gradually after May and reaches the highest of 0.69% in December;The content of kaempferol increases rapidly from May to July and is stable after July,reaches the highest of 1.02% in October,then declines gradually along with the increases of quercetin's content;the content of total flavone increases rapidly in May,reaches 1.74%,then increases to 2.22% slowly from June to December,reaches the highest of 2.78% in December,then declined rapidly to 0.34% in the next January.