排序方式: 共有4条查询结果,搜索用时 140 毫秒
1
1.
[目的]确定狭叶红景天药材的最佳提取工艺。[方法]采用超声、回流、冷浸法,选用甲醇、无水乙醇、纯水3种溶剂对狭叶红景天进行提取;采用L9(3^4)正交试验法,考察乙醇浓度、料液比、提取时间、提取次数4因素对红景天主要有效成分提取的影响。[结果]结果表明,回流提取为最适提取方法;甲醇提取效率最高,但考虑到生产成本,大量提取选用乙醇较适合;各因素对提取率的影响次序依次为:乙醇浓度〉提取时间〉料液比〉提取次数,最佳提取工艺条件为:8倍量60%乙醇回流提取2次,每次提取2.0h。[结论]该研究结果为有效利用狭叶红景天资源及其工业生产提供依据。 相似文献
2.
3.
A.G. Bidez P. Gmez J.A. Del Río A. Ortuo 《Physiological and Molecular Plant Pathology》2006,69(4-6):224-229
The phenolic composition of olive roots and stems was studied by high performance liquid chromatography–mass spectrometry. The in vivo levels of the principal phenolic compounds found in olive plants infected by Phytophthora megasperma Drechsler and Cylindrocarpon destructans (Zinssm.) Scholten differed from the levels observed in non-infected plants. When the antifungal activity of these compounds against both fungi was studied in vitro, the most active were quercetin and luteolin aglycons, followed by rutin, oleuropein, p-coumaric acid, luteolin-7-glucoside, tyrosol and catechin. Microscopic study showed that these phenolic compounds affected the growth, morphology and ultrastructure of the fungi. Taken together, these findings suggest that the phenolic compounds present in olive plants play an active role in the protection against pathogen attack. 相似文献
4.
1