共查询到19条相似文献,搜索用时 187 毫秒
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《广州化工》2016,(7)
探讨了桃树叶中黄酮的提取方法,研究了溶剂浸提温度、时间、固液比、乙醇浓度,超声波或微波辅助等对桃叶中黄酮提取效果的影响。研究结果表明:溶剂浸提中,影响因素依次为:料液比乙醇浓度浸提温度水浴时间;超声波辅助提取中则为乙醇浓度料液比浸提温度超声时间;微波提取中则又为微波时间微波功率料液比乙醇浓度。用70%乙醇作为浸提溶剂,料液比1∶25,温度控制在30℃,1次浸提40 min,桃叶黄酮提取率1.81%;采用超声波辅助提取,料液比为1∶30,浸提温度控制在50℃,提取30 min,用70%乙醇提取桃叶黄酮,提取率最高达3.98%;使用微波辅助提取时,料液比1∶30,微波功率控制在200 W,用60%乙醇提取30 s,则黄酮提取率3.92%。由此可见,纯粹用溶剂提取,提取率较低,不到2%,采用超声波或微波辅助提取,可达近4.0%。 相似文献
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采用超声波辅助法从黑米粉末中提取黑米色素.通过单因素实验考查了提取温度、提取时间、料液比、超声波功率对色素提取率的影响.在单因素试验基础上,结合正交试验优化提取工艺.实验数据分析得出:提取温度为35℃,提取时间为35 min,料液比为1:6 g/mL,超声波功率为70 W时,黑米色素的提取率最高. 相似文献
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Extraction optimization of oleanolic and ursolic acids from pomegranate (Punica granatum L.) flowers
《Food and Bioproducts Processing》2014,92(3):321-327
An ecofriendly ultrasonic-assisted extraction (UAE) technique was developed for rapid extraction of bioactive compounds oleanolic and ursolic acids from pomegranate flowers. Several different influential extraction parameters, such as ultrasonic power, extraction time, solvent type, aqueous ethanol concentration, loading ratio and extraction temperature, were investigated. The optimum extraction conditions were 90% ethanol solution as solvent, ultrasound power 150 W, the liquid:material ratio of 20:1 (v/w) and extraction for 50 min at 40 °C. Scanning electron microscopy showed that ultrasonic treatment resulted in a number of pits on cells of pomegranate flowers. Extracts obtained from 30 min of UAE showed higher antioxidant activity than those of other conventional methods. The UAE method was more efficient than classical methods included maceration, stirring extraction and heat reflux extraction. 相似文献
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系统研究了以加勒比松树皮为原料提取原花青素的方法及工艺条件。研究对比了常规溶剂浸提、超声波提取及微波辅助提取等方法对原花青素提取得率的影响。实验结果表明,溶剂浸提采用 70% 乙醇溶液时原花青素的得率最高。在3种提取方法中,超声波提取法和微波辅助提取法提取效果较优。前者能在短时间内取得较高的提取得率,而后者需进一步延长微波辅助作用后溶剂浸提的时间才能达到较好的提取效果。超声波提取法的适宜提取条件为: 提取温度 50℃,功率 100 W,料液比1:11,提取时间 1.5 h;微波辅助提取法的适宜提取条件为: 功率 200 W,微波处理时间 30 s,料液比1:11,提取温度 50℃,提取时间 6 h。在上述条件下原花青素得率分别为 7.47% 和 7.69%。 相似文献
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This study demonstrated a promising method for quickly extracting tea polyphenol (TP) by microwave-assisted extraction (MAE)
technology. Some influential parameters, including MAE temperature, microwave power, concentration of extraction solvent,
MAE time and the solid/liquid ratio, were investigated. The optimum condition of MAE was obtained by dual extraction with
60% ethanol (v/v) and the solid/liquid ratio 1:12 g/mL at 80°C for 10 minutes under the microwave power 600W. The yield of
TP was 96.5% under the described condition. Compared with traditional methods, including hot reflux extraction (HRE), ultrasound-assisted
extraction (UAE) and supercritical fluid extraction (SFE), the extraction time was saved 8 times than that of HRE, and the
yield was increased by 17.5%. The extraction time at comparable levels of production was saved 2 times, and the energy consumption
was one fourth that of UAE. The extraction time was saved 5 times than that of SFE, and the yield of TP was increased by 40%.
Moreover, compared with MAE of TP studied by others, it decreased the solid/liquid ratio from 1: 20 to 1: 12 g/mL without
90-min pre-leaching time, and the yield of TP was increased by 6%–40%. 相似文献
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This study demonstrated a promising method for quickly extracting tea polyphenol (TP) by microwave-assisted extraction (MAE) technology. Some influential parameters, including MAE temperature, microwave power, concentration of extraction solvent, MAE time and the solid/liquid ratio, were investigated. The optimum condition of MAE was obtained by dual extraction with 60% ethanol (v/v) and the solid/liquid ratio 1:12 g/mL at 80°C for 10 minutes under the microwave power 600 W. The yield of TP was 96.5% under the described condition. Compared with traditional methods, including hot reflux extraction (HRE), ultrasound-assisted extraction (UAE) and supercritical fluid extraction (SFE), the extraction time was saved 8 times than that of HRE, and the yield was increased by 17.5%. The extraction time at comparable levels of production was saved 2 times, and the energy consumption was one fourth that of UAE. The extraction time was saved 5 times than that of SFE, and the yield of TP was increased by 40%. Moreover, compared with MAE of TP studied by others, it decreased the solid/liquid ratio from 1 ∶ 20 to 1 ∶ 12 g/mL without 90-min pre-leaching time, and the yield of TP was increased by 6%–40%. 相似文献
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采用单因子试验和L9(34)正交试验设计,比较了热水浸提、超声波辅助热水浸提中料液比、提取时间、提取温度、盐浓度和超声波功率对蒲公英糖蛋白提取率的影响。热水浸提蒲公英糖蛋白的最佳工艺参数为:料液比1∶25、温度80℃,浸提时间3 h、盐浓度0.1 mol/L。超声波辅助提取的最佳工艺参数为:料液比1∶15、功率120 W、时间15 min、盐浓度0.1 mol/L。两种方法相比,超声波辅助法所需时间更短,但糖蛋白提取率较热水浸提低,在实际应用时需要综合考虑。 相似文献