Abstract:

The flavonoids, anthocyanin, simple phenols, lignin and soluble protein of the leaves in Ginkgo biloba phyllomes were assayed in 1998～1999. The results indicated that there were two peaks of flavonoids content, one rested on July 4, and the other on Nov.1. The change trend of anthocyanin content with much fluctuation was similar to that of flavonoids content. Simple phenols content rose in the early stage, and reached its first peak on July 4, then its content valleys showed on Aug.1 and Oct.17 apiece. First peak of lignin content was later, and the second peak earlier compared with flavonoids content peaks. There were opposite trends between flavonoids and soluble protein during the early and late stages. It was proved that there was a positive significant correlation between flavonoids and simple phenols, and anthocyanin, and lignin apiece. Positive significant correlation between flavonoids and protein also existed from the middle July to the late September. However, only negative significant correlation between flavonoids and protein was obtained by the analysis of partial correlation. The relationships between flavonoids and its transforming products, and precursors, and competitors were discussed.

Key words: Ginkgo biloba leaf, Flavonoids, Anabolic rule, Correlation and partial correlation