共查询到19条相似文献,搜索用时 140 毫秒
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基于紫杉醇的抗癌功效,探究何种条件(乙醇浓度,固液比,提取时间,提取次数,提取功率,温度,颗粒直径,溶媒,提取方法,提取部位)下,能在有限的红豆杉中最大量的提取紫杉醇很有必要。在单因素条件的基础上,选取预处理中影响紫杉醇提取的4个因素(固液比,提取时间,超声波功率,温度)进行4因素3水平(L9(34))正交实验。然后对K值进行分析,得出结论:最优的超声波预处理实验组合为温度50℃、固液比为1:35、超声波提取时间为40 min、超声波功率为70%。最后采取氧化铝柱层析进一步除杂,通过高效液相色谱结果,对提取纯化的效果进行分析。 相似文献
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本实验采用不同浓度的乙醇溶液作为提取溶剂,使用超声波辅助提取,从苦瓜中连续提取皂苷、黄酮、多糖.选择乙醇浓度、超声时间、料液比分别进行提取皂苷、黄酮、多糖的正交实验,得出提取皂苷的最优条件:95%乙醇、超声30 min、料液比1:20 g/mL;提取黄酮的最优条件:60%乙醇,超声35 min、料液比1:25 g/mL... 相似文献
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The apparent composition of Kentucky 9/14 solvent refined coal (SRC) has been determined by two Soxhlet solvent extraction techniques and one ultrasonic bath extraction technique. Each Soxhlet method gave significantly different composition results. Further, neither Soxhlet method gave results which agreed with data from the ambient temperature ultrasonic bath extractions. A third Soxhlet method involving reverse sequential extraction was found to be unsatisfactory for routine quantitative use because of excessive solvent loss and the possibility of sample repolymerization. 相似文献
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Chlorophylls were extracted by using ultrasonic from Spirulina platensis. Single factor examination and response surface analysis experiments were adopted to investigate the effects of extraction time, extraction solvent, solvent concentration, ratio of liquid to solid and extraction grade. The results showed that the optimal process parameters for this method were: extraction time of 56.5 min, ethanol concentration of 48.3% (vol) of ethanol/acetone solvent, and ratio of liquid to solid of 7. 9 ml·g-1. The optimized chlorophylls extraction yield was 1.28%. The comparison experimental results indicated that the yield of chlorophylls by ultrasonic extraction was higher than that obtained from conventional solvent extraction. 相似文献
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通过正交试验探讨了巨尾桉叶中原花色素的3种提取方法的最佳提取工艺条件,并进行了对比。结果显示,传统溶剂提取法的最优工艺为:60%乙醇、80 ℃、100 min、料液比1:14(g:mL,下同),原花色素得率5.95%;微波辅助提取法的最优工艺为:50%乙醇、微波功率200 W、微波时间4 min、料液比为1:20,得率5.48%;超声波辅助提取法的最优工艺为:60%乙醇、60 ℃、超声波时间25 min、料液比为1:14,得率为6.07%。超声波辅助提取法效果最好,时间短,得率高。实验对超声波提取物的不同溶剂萃取物体外抗氧化性和抗肿瘤活性进行了研究,结果表明,乙酸乙酯萃取物抗氧化作用较强,当质量浓度为1.2 g/L时,对DPPH自由基清除率达到96.33%;乙酸乙酯萃取物质量浓度为2 g/L时,对于人肝癌细胞Bel-7404具有很强的抗肿瘤活性,抑制率为56.37%。 相似文献