共查询到18条相似文献,搜索用时 78 毫秒
1.
从甘草中提甘草酸不同提取方法的比较 总被引:18,自引:0,他引:18
对几种不同的从甘草中提取甘草酸的提取方法进行了实验比较。结果表明,微波辅助提取法与热回流法、索氏(Soxhlet)提取法、室温提取法等传统方法相比,具有提取高效、快速、完全及节省时间、溶剂和能 耗等优点,是一种适于从甘草中快速提取甘草酸的新方法。 相似文献
2.
3.
甘草是我国传统的中药,来源于豆科植物甘草(Glycyrrhiza uralensis Fisch)、胀果甘草(G.inflata Bat.)或光果甘草(G.glabra L.)的干燥根和根茎[1]。具有多种药用功效,主要生长在我国西北、华北、东北等三北地区[1]。近年来在内蒙古自治区西部人工栽培甘草已获成功,甘草资源极为丰富[2]。甘草酸(glycyrrhizic acid,GA)又名甘草甜素,是甘草中分离出的一种三萜类化合物[3],也是最重要的有效成分之一。本文对甘草中甘草酸及其他成分的提取分离方法进行了摸索和改进,取得了较好的效果。 相似文献
4.
5.
6.
7.
8.
9.
《精细化工原料及中间体》2008,(1):48-48
甘草酸是甘草药理作用中重要的有效成分。目前甘草酸比较成熟的提取方法主要是将甘草切片用乙醇和氨水的混合溶剂在室温下浸泡、加热回流或加超声波辅助提取;然后再用结晶或(离子交换)吸附等方法进行纯化。缺点是提取过程耗时长、能耗高;纯化过程操作烦琐,需反复分离纯化。 相似文献
10.
11.
简单介绍了甘草酸的药用历史和药理作用以及在国民经济中的应用。列举了甘草酸的提取方法,主要从提取溶剂和提取纯化手段两方面考虑。从提取溶剂方面考虑,主要有水提取法、稀氨水提取法、乙醇提取法、碱性乙醇提取法和复合酶法提取法;从提取纯化手段考虑,主要有微波辅助法、超声强化法、膜技术、多级逆流技术提取法、静电场协同超声提取法、间歇式泡沫分离、双水相萃取技术和大孔树脂法等。综述了以上提取方法,为进一步开发甘草资源提供参考。 相似文献
12.
Minglei Tian Hongyuan Yan Kyung Ho Row 《International journal of molecular sciences》2008,9(4):571-577
The extraction and separation conditions of glycyrrhizic acid and glabridin from licorice were investigated. By changing the different extraction solvents, procedures, times and temperature, the optimum extraction condition was established: the used of ethanol/water (30:70, v/v) as an extraction solvent, and 60 min dipping time under 50°C. The extracts of licorice were separated and determined by reversed-phase high performance liquid chromatography with a methanol/water (70:30, v/v, containing 1% acetic acid) as the mobile phase. Under the optimum extraction condition, 2.39 mg/g of glycyrrhizic acid and 0.92 mg/g of glabridin were extracted from Chinese licorice and the recoveries were 89.7% and 72.5% respectively. 相似文献
13.
《分离科学与技术》2012,47(14):3259-3270
Abstract An attempt has been made to extract glycyrrhizic acid (GA) from licorice root by surfactant mediated cloud point extraction (CPE) using non‐ionic surfactant (Triton X‐100). Almost all of the GA molecules were concentrated in the surfactant‐rich phase (also called coacervate phase) after phase separation. The pH is the most critical factor regulating the distribution of GA in the micelle which related to the ionization form. The other effects of the concentration of GA and the surfactant, the temperature, and the salt concentration on the extraction efficiency of GA in the coacervate phase and aqueous phase have been studied. The mechanism of CPE of GA was explored with transmitting electron microscopy. It was deduced that aggregate GA molecules were adsorbed on micelles' outer poler mantle and inner cross‐linked micelles at high GA concentrations in coacervate phase. 相似文献
14.
建立甘草次酸的检测方法,观察不同提取方法对甘草次酸含量的影响.以新疆甘草为原料药,采用水提-超声、醇提-超声的方法获得甘草提取物,利用RP-HPLC技术以甲醇:2.0%醋酸水溶液(86∶14)为流动相,在C18(4.6×125mm)、室温、检测波长254nm、流速0.8mL·min-1条件下,分离、检测提取物中甘草次酸的含量.结果在上述分离条件下,甘草次酸获得了较好的分离效果.同时,研究发现不同的提取方法显著地影响了提取物中甘草次酸的含量.结论:合适的提取方法有助于提高甘草提取物中有效成分的含量. 相似文献
15.
加压微波辅助水解甘草酸粗品制备甘草次酸(英文) 总被引:1,自引:0,他引:1
A pressured microwave-assisted hydrolysis(PMAH) technique has been developed for hydrolyzing the crude glycyrrhizic acid(GA) extracted from licorice root to prepare glycyrrhetinic acid(GRA).In order to optimize the efficiency of PMAH,several experimental parameters were investigated,including liquid-solid ratio,hydrolysis time,sulfuric acid concentration and hydrolysis temperature.The optimized hydrolysis conditions were as follows:pressured microwave-assisted hydrolysis of crude GA for 21 min(taking 15 min to reach 150 oC,and holding it for 6 min) at 150 oC(at a radiation power of 450 W) in 3%-5% sulfuric acid solution with the liquid-solid(ml?g?1 crude GA) ratio of 25︰1.As a result of the considerable saving in time and higher product yields(up to 90%),PMAH was proved more effective than conventional methods. 相似文献
16.
微波萃取、高效液相色谱法测定番石榴叶中的齐墩果酸和熊果酸 总被引:5,自引:0,他引:5
建立了微波萃取、高效液相色谱测定番石榴叶中齐墩果酸和熊果酸的方法。采用分式析因设计实验考察了微波萃取参数的影响,番石榴叶粒度和萃取时间是影响齐墩果酸和熊果酸的微波萃取产率的最重要因素。优化的微波萃取条件如下:60~80 mesh番石榴叶、10 mL乙醇、80℃和10 min。微波萃取与索氏萃取得到的齐墩果酸和熊果酸产率一致,然而,前者仅需10 min,后者则需要4 h。 相似文献
17.
18.
金银花中绿原酸的微波辅助提取工艺研究 总被引:1,自引:0,他引:1
采用微波辅助法提取金银花中的绿原酸,研究了乙醇体积分数、料液比、微波功率和微波处理时间对绿原酸提取率的影响.通过单因素实验和正交实验确定最佳提取工艺为:乙醇体积分数60%、料液比1∶ 10(g∶ mL)、微波功率300 W、微波处理时间9 min,在此条件下,绿原酸提取率达3.779%. 相似文献