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两种提取枸杞多糖方法的比较研究 总被引:2,自引:0,他引:2
通过正交实验对热水浸提法和微波提取法提取枸杞多糖进行了比较研究。热水浸提法提取枸杞多糖的最佳工艺条件为:提取温度70℃、提取时间4h、料液比1∶20(g∶mL)、提取次数3次,提取率为4.51%;微波提取法提取枸杞多糖的最佳工艺条件为:微波功率560W、微波时间90s、料液比1∶10(g∶mL)、提取次数3次,提取率为5.91%。微波提取法时间短、能耗小、提取溶剂用量少、提取率高,优于热水浸提法。 相似文献
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《山东化工》2015,(15)
研究超声波辅助提取板蓝根多糖的最佳工艺条件和板蓝根多糖提取液的抗氧化活性。首先考察了料液比、超声功率和超声时间三个单因素对板蓝根多糖提取率的影响,在此基础上采用正交试验设计,选择料液比、超声功率及超声时间三个因素按L9(33)正交表进行实验,优化超声波提取的工艺条件。最后,通过三种不同体系(还原能力、羟自由基和超氧阴离子自由基)研究了板蓝根多糖提取液的抗氧化活性。板蓝根多糖超声提取的最佳工艺条件为:料液比为1∶40,超声时间为60min,超声功率为100W,在此条件下多糖的提取率为32.3%。板蓝根多糖提取液具有一定的还原能力,对羟基自由基和超氧阴离子自由基具有较好的清除。与传统的热水浸提法相比,超声波辅助提取方法大大缩短了提取时间,提高了多糖的提取率。板蓝根多糖具有一定的抗氧化活性,且随着多糖量的增加其抗氧化能力也相应增加。 相似文献
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超声强化溴化1-乙基-3-甲基咪唑从黄花蒿中提取青蒿素 总被引:1,自引:0,他引:1
利用超声强化[emim]Br(溴化1-乙基-3-甲基咪唑)-水体系从黄花蒿粉末中提取青蒿素. 正交实验和单因素实验结果表明,影响黄花蒿中青蒿素提取因素的显著性次序为液固比>提取时间>提取温度>超声波功率>占空比. 综合考虑单因素实验结果及成本,得出优化工艺条件为黄花蒿原料粒度0.38 mm,液固比50 mL/g,提取时间30 min,提取温度20℃,超声波功率600 W,占空比1.6 s/0.4 s. 在上述条件下青蒿素提取量为4.37 mg/g,提取率为97%. 相似文献
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Optimization of Total Flavonoid Compound Extraction from Gynura medica Leaf Using Response Surface Methodology and Chemical Composition Analysis 总被引:2,自引:0,他引:2
Liu W Yu Y Yang R Wan C Xu B Cao S 《International journal of molecular sciences》2010,11(11):4750-4763
Optimization of total flavonoid compound (TFC) extraction from Gynura medica leaf was investigated using response surface methodology (RSM) in this paper. The conditions investigated were 30-60% (v/v) ethanol concentration (X(1)), 85-95 °C extraction temperature (X(2)) and 30-50 (v/w) liquid-to-solid ratio (X(3)). Statistical analysis of the experiments indicated that temperature and liquid-to-solid ratio significantly affected TFC extraction (p < 0.01). The Box-Behnken experiment design showed that polynomial regression models were in good agreement with the experimental results, with the coefficients of determination of 0.9325 for TFC yield. The optimal conditions for maximum TFC yield were 55% ethanol, 92 °C and 50 (v/w) liquid-to-solid ratio with a 30 min extraction time. Extracts from these conditions showed a moderate antioxidant value of 54.78 μmol quercetin/g dry material (DM), 137.3 μmol trolox/g DM for 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 108.21 μmol quercetin/g DM, 242.31 μmol trolox/g DM for 2,2-azino-bis-(3-ethylbenzthiazoline-6-sulphonic acid) (ABTS(+)), respectively. HPLC-DAD-MS analysis showed that kaempferol-3-O-glucoside was the principal flavonoid compound in Gynura medica leaf. 相似文献
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用正交试验法确定了超声提取佩兰黄酮类化合物的最佳工艺参数。最佳提取条件为:70%乙醇为溶媒,超声功率为50kHz时,超声时间30min、超声温度40℃、物料比1:15,提取4次,在此条件下能达到最佳的提取效果,稳定性良好。对佩兰提取的黄酮成分进行抗菌研究发现,其对四联球菌、金黄色葡萄球菌、大肠杆菌和枯草杆菌具有一定的抑菌作用。 相似文献
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《分离科学与技术》2012,47(18):2771-2778
The quantitative effects of extraction time, extraction temperature, concentration of alkali solution, and ratio of solid to liquid on yield of perilla seed meal polysaccharides were investigated using response surface methodology (RSM). The experimental data obtained were fitted to a second-order polynomial equation using multiple regression analysis and also analyzed by appropriate statistical methods. By solving the regression equation and also by analyzing the response surface contour plots, the optimal ultrasound-assisted (ultrasonic power was 70 W) extraction conditions of polysaccharides were determined: Extraction time of 29.4 min, extraction temperature of 42.8°C, concentration of NaOH of 4.5 mol/L, and ratio of liquid to solid of 22 g/mL. These predicted values were also verified by validation experiments. 相似文献
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以西藏某盐湖卤水浓缩液为研究对象,对影响萃取和反萃取的诸多因素如料液酸度、萃取剂配比、萃取和反萃取时间、反萃取剂浓度、相比等进行了详细试验研究,获得了混合醇提硼适宜的萃取条件:原料液pH=3,混合醇萃取剂与磺化煤油的体积比V(2-乙基-1,3-己二醇)∶V(异辛醇)∶V(磺化煤油)=3∶7∶10,相比为1.0,萃取时间为
10 min;反萃取条件:反萃取剂浓度为0.3 mol/L,相比为1.0,反萃取时间为10 min。在此工艺条件下,萃取率>96%,反萃取率>95%。另外,在本原料液体系中,以二元醇与一元醇的混合醇作为萃取剂萃取硼,萃取效果远好于一元醇。 相似文献