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为探究井栏边草中齐墩果酸的含量情况,使用紫外-可见分光光度法对其含量进行测定。测定结果为:在40℃的条件下利用超声仪将1g井栏边草用无水乙醇提取90min所测得的含量为0. 113mg/g,即1g干草中含有0. 113mg齐墩果酸。通过正交试验,有效影响到齐墩果酸含量的因素有超声提取时间、超声提取温度、乙醇浓度,其的影响效果依次降低,最优水平为A_2B_2C_3或A_2B_3C_3。即当超声提取温度为50℃,提取时间为150min,溶剂乙醇的浓度为95%或100%,所测得齐墩果酸含量为0. 162mg/g。 相似文献
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狗舌草中总黄酮的提取工艺研究 总被引:1,自引:0,他引:1
目的:研究狗舌草中总黄酮的提取工艺并测定总黄酮含量。方法:采用单因素和正交试验相结合的方法,对提取时间、提取温度、提取次数、料液比4个因素进行研究,并以芦丁为标准品,紫外分光光度法测定总黄酮含量。结果:狗舌草总黄酮的料液比,提取温度影响较大,提取时间、提取次数相对较小。结论:最佳提取工艺:提取温度80℃,料液比1:10,提取时间3h,提取次数2次。 相似文献
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花生壳中总黄酮和木犀草素提取工艺研究 总被引:2,自引:0,他引:2
研究花生壳中总黄酮和木犀草素的提取工艺.经正交试验,以提取物中总黄酮和木犀草素含量为评价指标.优选提取工艺.确立以75%乙醇为溶剂,料液比1:10,每次提取2h,提取3次为优选工艺,花生壳中总黄酮和木犀草素均可有效提取.该工艺简捷、经济、可行,适合工业化生产. 相似文献
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鲜法匀浆萃取烟叶中茄尼醇的研究 总被引:25,自引:0,他引:25
为了建立一种高效提取烟叶中茄尼醇的方法,对鲜法匀浆萃取烟叶中茄尼醇的工艺进行了研究,确定了最佳的工艺参数:提取原料为含水率80%的鲜烟叶,溶剂为90%的乙醇,匀浆时间20min,液固比为6:1(mL:g).将该法与超声提取、索氏提取和超临界二氧化碳萃取进行了比较.结果表明,在优化的条件下,鲜法匀浆对原料的匀浆粒度为40~80μm,茄尼醇的提取率为0.722%,分别是超声提取、索氏提取、超临界二氧化碳萃取的1.32、1.62和1.98倍.鲜法匀浆萃取所用提取时间短,提取溶剂用量少,因此,该法是一种高效提取烟叶中茄尼醇的方法. 相似文献
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研究了以水提酸沉法提取黄芩中黄芩苷的最佳提取工艺。考察了水的用量、提取温度、提取时间、酸沉等多种因素对黄芩苷收率的影响。实验结果表明,提取黄芩苷的最佳工艺条件为:水提取两次,两次液固比分别为10和5,时间分别为60 min和30 min,双层滤布过滤再离心分离,80℃加酸并保温60 min,酸沉静置3.0 h。在此条件下,黄芩苷收率可达11.85%。 相似文献
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《分离科学与技术》2012,47(7):1014-1022
Hot water extraction process was used for the extraction of steviosides from dry stevia leaves. The independent variables were, leaf to water ratio (1:5 to 1:20), heating time (10 to 120 min), and temperature (30 to 90°C). The combined effects of these independent variables on the extracted stevioside concentration and color of the extract were studied. For optimizing the extraction process, central composite rotatable design in combination with response surface methodology was used. Significant regression models with coefficient of determination greater than 0.90 were established to study the effect of independent variables on the responses. The optimum conditions are: temperature of water: 78°C, time of heating: 56 min and leaf to water ratio: 1:14 (g:mL). 相似文献
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《分离科学与技术》2012,47(4):616-624
Active compounds, terpinene-4-ol and (E)-1-(3,4-dimethoxyphenyl) butadiene (DMPBD), displaying anti-inflammatory activity, were successfully extracted from the rhizome of Zingiber cassumunar Roxb. by pressurized liquid extraction (PLE) using methanol or ethanol and by superheated water extraction (SWE). Optimum conditions of both techniques were 1 mL/min flow rate and 5 min static time. The extraction temperature and dynamic time of the PLE and the SWE were 100°C 5 min and 140°C 20 min, respectively. Compared with water distillation, solvent sonication, and Soxhlet extraction, the PLE produced the highest amount of DMPBD and terpinene-4-ol, whereas the SWE and water distillation provided similar results. 相似文献