红凤菜和白子菜总黄酮含量的动态变化

红凤菜Gynura bicolor (Willd. ) DC. ]和白子菜G. divaricata (L. ) DC. ]均为菊三七属(Gynura Cass. )植物~(1]).红凤菜的嫩茎叶中含有丰富的营养成分,可作蔬菜食用~(2]);白子菜叶片在民间用于治疗糖尿病,动物实验证明其有显著的降血糖作用~(3]).

Dynamic change of total flavonoids content in Gynura bicolor and G. divaricata

The dynamic change of total flavonoids content in above-ground part of Gynura bicolor (Willd. ) DC. And G. Divaricata (L. ) DC. From two locations was researched. The result shows that the total flavonoids content in G. Bicolor and G. Divaricata leaf is lower in June and July, higher in the beginning and the middle of August and then has a certain decrease with a great fluctuation. Total flavonoids content in leaf of G. Bicolor reaches the highest with a value of 12.031 mg·g~(-1) at the 15th August, and that in leaf of G. Divaricata-1(from Zhejiang of China) and G. Divaricata-2 (from South America) is the highest at the 1st August with a value of 17.381 and 19.935 mg·g~(-1), respectively. The total flavonoids content in leaf of G. Bicolor and G. Divaricata is higher than that in stem. Except leaf of G. Divaricata-2, the total flavonoids content in stem and leaf appears decreasing trend from upper to lower part gradually. Therefore, taking total flavonoids content for an index, it is suitable to harvest upper leaf of G. Bicolor, upper leaf and stem of G. Divaricata-1, and whole leaf of G. Divaricata-2 in August.