共查询到19条相似文献,搜索用时 93 毫秒
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印楝种仁中印楝素微波萃取方法研究 总被引:8,自引:4,他引:8
以家用变频微波炉改造而成的微波化学反应器为主要设备 ,研究了在微波诱导下萃取印楝种仁中印楝素的方法。对微波功率、辐射时间和萃取溶剂等影响微波萃取的条件进行了筛选 ,优化条件为以甲醇为萃取溶剂 ,微波功率 2 80W ,辐射时间 10 0s,溶剂用量 12 0ml。以HPLC法测定萃取物中的印楝素A含量 ,采用HypersilODS (4mm× 2 5 0mm)色谱柱 ,水 乙腈 (6 3∶37)为流动相 ,检测波长 2 18nm ,流速为 1ml/min。将微波萃取法与常规甲醇室温浸提法和加热回流法进行了比较 ,结果表明 ,微波诱导萃取法具有萃取速度快、溶剂用量少、萃取效率高等优点。 相似文献
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多溶剂萃取法精制印楝素的研究 总被引:4,自引:1,他引:3
对比研究了多溶剂萃取法与单溶剂萃取法精制印楝素的效果,并通过正交试验法选择了多溶剂萃取法精制印楝素的最佳试验条件为:萃取溶剂V(二氯甲烷):V(乙酸乙酯)1:5,分相液V(丙酮):V(水)1:1,V(萃取溶剂):V(分相液)10:3,该方法可将乙醇提取物中印楝素的质量分数从 3.68% 提高到 17.76%。多溶剂萃取法是一种简单高效的精制印楝素的方法。 相似文献
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超临界CO2萃取印楝种子中印楝素的研究 总被引:5,自引:2,他引:5
《精细化工》2003,20(9):513-514
应用超临界CO2萃取技术从印楝种子中萃取印楝素,研究了萃取温度、压力和夹带剂对印楝素萃取效果的影响.当萃取温度为35
℃、压力为15 MPa、甲醇用量为CO2体积的3%时,可将印楝种子中90%以上的印楝素A萃取出来,所得产品印楝素A的质量分数为20.3%. 相似文献
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印楝素的快速提取法研究 总被引:4,自引:0,他引:4
采用微波辐射、超声波强化和快速搅拌三种辅助方法从印楝种仁粉中提取印楝油和印楝素。研究结果表明,快速搅拌法印楝油、二氯甲烷粗提物、印楝素A和印楝素B的提取率均高于微波辐射法和超声波强化法,具有明显的提取优势。 相似文献
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Plant-derived pesticides are gaining popularity on account of the increasing sustainable farming practices and also due to the environmental and health hazards resulting from excessive usage of their synthetic counterparts. The neem (Azadirachta indica A. Juss) tree, belonging to the Meliaceae family, is a storehouse of insecticidal azadirachtin, which possess antifeedant, growth disrupting and larvicidal properties against an array of agricultural insect pests. Pressurized Hot Solvent Extraction (PHSE) is fast emerging as an efficient means for recovering valuable active ingredients from natural plant matrices at an accelerated rate and with a reduced solvent consumption. The technique employing heated organic solvents at elevated pressures is a potential green substitute for conventional solvent extractions. The present study deals with the extraction of azadirachtin from defatted neem seed kernels (NSK) using pressurized methanol. Important operating variables like temperature, pressure, extraction time, solvent flow rate and particle size influencing the extraction efficiency were investigated in detail. The azadirachtin content in the extracts was determined by HPLC. The optimum conditions for maximizing azadirachtin yield were found to be 50 °C temperature, 50 bar pressure, −60 + 80 mesh particle size and 5 mL/min extractant flow rate. Under optimal conditions, 210.93 mg azadirachtin was extracted per 100 g defatted NSK within an extraction time of 100 min. Moreover, the proposed method resulted in 1.5 fold reduction in solvent consumption as compared to conventional maceration. 相似文献
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微波和超声波辅助提取穿心莲内酯 总被引:2,自引:1,他引:1
用正交法对微波和超声波辅助提取穿心莲内酯的工艺条件进行优化。微波辅助法提取穿心莲内酯的最佳工艺条件为温度40℃、提取溶剂为体积分数75%的乙醇、提取时间8 min;超声波辅助法提取穿心莲内酯的最佳工艺条件是提取溶剂为体积分数75%的乙醇,超声效率40%、超声时间50 min。微波提取法的平均回收率为99.9%,RSD为0.31%;超声波提取法的平均回收率为100.5%,RSD为0.21%。与超声波提取法相比,微波提取法提取时间较短,提取得率较高。 相似文献
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《分离科学与技术》2012,47(8):1248-1254
Microwave assisted extraction of sour cherry pomace at different conditions were compared with conventional extraction in terms of total phenolic content and antiradical efficiency. Total phenolic content and antiradical efficiency at the optimum conditions (700 W, ethanol-water, 12 min, 20 mL solvent/ g solid) of microwave assisted extraction were 14.14 mg GAE/g sample and 28.32 mg DPPH·/g sample, respectively. Total phenolic content and antiradical efficiency of extracts obtained by conventional extraction were 13.78 mg GAE/g sample and 24.74 mg DPPH·/g sample, respectively. Microwave assisted extraction increased antiradical efficiency and concentration of phenolic acids and shortened extraction time significantly. 相似文献
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《分离科学与技术》2012,47(1):64-70
Solvent extraction, ultrasound assisted extraction (UAE), and microwave assisted extraction (MAE) were examined for the extraction of astaxanthin from Haematococcus pluvialis. In all cases, acetone was found to give the highest astaxanthin recovery compared with other selected solvents, i.e., methanol, ethanol, and acetonitrile. Among the various methods, MAE at 75°C for 5 min resulted in the highest astaxanthin recovery (74 ± 4%). 相似文献