2006•Zhiwu ziyuan yu huanjingRequires access

Comparison of total flavonoid content in leaves of Lycium barbarum at different picked times

Wen Huai-xiu, Shao Yun, Fuquan Jiang, Xiaohui Zhao, Tao Yan-duo

Abstract

The contents of total flavonoids in leaves of Lycium barbarum L.at different picked times were determined by RP-HPLC.It was showed that thecontent of total flavonoids in leaveswas the highest(1.99%) in May and the second(1.36%) in August,and decreased sharply after September and went down to the lowest in October(0.36%).So the best picked time in Xi′ning City,Qinghai Province was early summer.Moreover,contents of three major aglycones,such as quercetin,kaempferol and isorhamntin,were compared.Consistently for all picked times,the content of quercetin was much higher than those of kaempferol and isorhamntin.

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Key concepts: Lycium, Kaempferol, Quercetin, Flavonoid, Chemistry, Botany, Horticulture, Traditional medicine