多指标-正交试验优化沙棘叶和沙棘籽中黄酮的提取工艺

摘要

目的:优化沙棘叶和沙棘籽中黄酮的提取工艺.方法:以6种黄酮苷元即儿茶素、芦丁、杨梅素、槲皮素、山柰酚、异鼠李素的提取率总和为指标,以乙醇体积分数、提取时间、提取次数、料液比为考察因素,采用L9(34)表设计正交试验,分别优化沙棘叶和沙棘籽中黄酮的提取工艺,并进行验证试验.结果:沙棘叶中黄酮的最优提取工艺为乙醇体积分数70%、提取3次、每次提取2.0 h、料液比1:16;沙棘籽中黄酮的最优提取工艺为乙醇体积分数50%、提取3次、每次提取1.5 h、料液比1:24;验证试验中,沙棘叶和沙棘籽中6种黄酮苷元的提取率总和分别为56.4、15.4 mg/g(RSD分别为1.4%、3.4%,n=3).结论:优化后的提取工艺方法简便、稳定、可行,可用于沙棘叶和沙棘籽中黄酮成分的提取.%OBJECTIVE:To optimize the extraction technology for flavonoids in leaves and seeds of Hippophae rhamnoides. METHODS:Using the total extraction rate of 6 flavonoid aglycones(catechins,rutin,myricetin,quercetin,kaempferol,isorham-netin)as index,ethanol volume fraction,extraction time,extraction times,material-lipid ratio as investigation indexes,L9(34)or-thogonal test was designed to optimize the extraction technology of flavonoids in leaves and seeds of H. rhamnoides,and verifica-tion test was carried out. RESULTS:The optimum extraction technology for flavonoids in leaves of H. rhamnoides was ethanol vol-ume fraction of 70%,extracting for 3 times with material-lipid ratio of 1:16,and 2.0 h each time;and that of seeds was ethanol volume fraction of 50%,extracting for 3 times with material-lipid ratio of 1:24,and 1.5 h each time. In verification test,the total extraction rate of 6 flavonoid aglycones was 56.4 mg/g in the leaves (RSD=1.4%,n=3) and 15.4 mg/g in the seeds (RSD=3.4%,n=3). CONCLUSIONS:Optimized extraction technology is simple,stable,feasible,and can be used for extracting the fla-vonoids in leaves and seeds of H. rhamnoides.