摘要
杨树芽经石油醚抽提脱脂或不脱脂、加水浸提去除水杨酸等水溶物或不除酸后,再用无水乙醇提取杨树芽脂,得到了脱脂除酸、脱脂未除酸、未脱脂除酸和未脱脂未除酸4种杨树芽提取物,它们的黄酮含量分别为34.0%、32.3%、28.2%和27.7%,均高于蜂胶的23.5%;这四种杨树芽提取物清除DPPH自由基能力分别为81.8%、84.2%、66.3%、69.7%,蜂胶为79.0%,黄酮含量与抗氧化活性的高低不呈现正相关关系;杨树芽提取物对DPPH自由基具有较好的清除能力,可作为天然抗氧化物资源加以开发利用。
Poplar bud is degreased by petroleum ether or not degreased,and washed with H2O to remove salicylic acid or without acid-removal,then poplar bud resin is extracted by absolute alcohol to get 4 kinds of extracts:degreased and acid-removing extract,degreased and not acid-removing extract,acid-removing and not degreased extract,not degreased nor acid-removing extract.The contents of flavonoids in the four extracts are 34.0%,32.3%,28.2% and 27.7%,respectively,which are all higher than that of propolis(23.5%).Th...
出处
《现代化工》
CAS
CSCD
北大核心
2008年第S2期335-337,共3页
Modern Chemical Industry
基金
江苏省农业三项工程项目[sx(2006)128]
