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以蒙古黄芪为试验材料,研究纤维素酶解辅助乙醇提取黄芪总黄酮的工艺条件。考察了酶添加量、酶解时间、液固比、乙醇浓度、提取时间、提取温度6个单因素对黄芪总黄酮提取率的影响,在单因素试验的基础上,选择四因素四水平进行正交试验优化工艺参数。结果表明:蒙古黄芪在纤维素酶添加量7.5μL/g,pH值4.0,温度55℃,酶解预处理1.5h后,液固比对黄芪总黄酮提取率影响显著,其次是提取时间和乙醇浓度,提取温度对黄芪总黄酮提取率的影响相对较小。在液固比30mL/g,乙醇浓度90%,提取温度75℃,提取时间2.5h的最优工艺条件下,黄芪总黄酮的提取率为0.57%。与传统醇提法(0.39%)相比,黄芪总黄酮提取率提高了46.15%。 相似文献
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秋葵中总黄酮提取工艺探讨 总被引:1,自引:0,他引:1
《食品科技》2016,(3)
分别用超声微波联用法与纤维素酶浸提法2种方法提取秋葵中黄酮类化合物,用硝酸铝-亚硝酸钠比色法测定提取的总黄酮含量,采用正交试验对2种方法下提取的总黄酮得率进行数据分析与比较。结果表明,纤维素酶浸提法比超声微波联用法提取秋葵黄酮得率高,纤维素酶浸提法最佳工艺:加酶量1.5%,酶解时间2 h,酶解温度50℃,酶解p H4.8,总黄酮得率为4.843%;超声微波联用法最佳工艺:微波功率550 W,料液比1:50(g/m L),超声时间30 min,微波时间60 s,总黄酮得率为3.278%,纤维素酶浸提法比超声微波联用法的黄酮得率提高了1.565%。 相似文献
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通过单因素实验和正交试验,对枸杞中总黄酮的微波辅助提取工艺进行研究.结果表明:微波辅助提取枸杞中总黄酮的最佳工艺条件为:90%的乙醇,固液比1:12,微波功率600 W,微波作用时间60 min.最佳工艺条件下,枸杞总黄酮提取率为1.04%. 相似文献
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直接浸出改造为挤压膨化浸出 总被引:6,自引:5,他引:1
在预处理工序加入膨化机 ,对原 12 0 0t/d工艺和设备进行相应的调整 ,有效地提高产量5 3% ,降低毛油中非水化磷脂含量 ,毛油精炼率提高 0 5 % ,粕中尿素酶稳定 ,改善了豆粕质量 ,减少蒸汽用量 11% ,动力消耗下降 12 %。 相似文献
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以白牛肝菌为试验原料,利用三相萃取法优化白牛肝菌多糖的提取工艺,并对其抗氧化性进行研究。对(NH4)2SO4添加量、叔丁醇添加量、萃取温度、水提次数等因素进行单因素试验,在此基础上进行响应面优化设计,得到最佳工艺条件为:(NH4)2SO4添加量30%、叔丁醇添加量10 mL、萃取温度37℃、水提次数1次,多糖提取率达到47.3%。白牛肝菌多糖的抗氧化性研究结果发现,白牛肝菌多糖对·OH和DPPH·的半数清除率值分别达到2.5 mg/mL和11.6 mg/mL,说明具有较高的抗氧化性,三相萃取法工艺很好的保留白牛肝菌多糖的活性。 相似文献
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本文研究了微波辅助萃取茶多酚的机理,利用植物切片技术并通过电子光学显微镜,比较在常温、热水萃取和微波萃取后茶叶叶肉组织的破碎程度的差异及组织细胞内部结构的微观变化,结果初步表明微波作用下的浸提过程,不仅存在热效应,还存在非热效应,即微波电磁场的极化作用,这能极大提高浸提速率.相对于同温热水浸提,35℃和90℃微波辅助浸... 相似文献
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Jun Watanabe Tomoyuki Oki Jun Takebayashi Yuko Takano‐Ishikawa 《Journal of food science》2014,79(9):C1665-C1671
The efficient extraction of antioxidants from food samples is necessary in order to accurately measure their antioxidant capacities. α‐Tocopherol and gallic acid were spiked into samples of 5 lyophilized and pulverized vegetables and fruits (onion, cabbage, Satsuma mandarin orange, pumpkin, and spinach). The lipophilic and hydrophilic antioxidants in the samples were sequentially extracted with a mixed solvent of n‐hexane and dichloromethane, and then with acetic acid–acidified aqueous methanol. Duplicate samples were extracted: one set was extracted using an automated pressurized liquid extraction apparatus, and the other set was extracted manually. Spiked α‐tocopherol and gallic acid were recovered almost quantitatively in the extracted lipophilic and hydrophilic fractions, respectively, especially when pressurized liquid extraction was used. The expected increase in lipophilic oxygen radical absorbance capacity (L‐ORAC) due to spiking with α‐tocopherol, and the expected increase in 2,2‐diphenyl‐1‐picrylhydrazyl radical scavenging activities and total polyphenol content due to spiking with gallic acid, were all recovered in high yield. Relatively low recoveries, as reflected in the hydrophilic ORAC (H‐ORAC) value, were obtained following spiking with gallic acid, suggesting an interaction between gallic acid and endogenous antioxidants. The H‐ORAC values of gallic acid–spiked samples were almost the same as those of postadded (spiked) samples. These results clearly indicate that lipophilic and hydrophilic antioxidants are effectively extracted from lyophilized food, especially when pressurized liquid extraction is used. 相似文献
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辣椒红素超临界萃取与有机溶剂萃取的比较 总被引:1,自引:0,他引:1
研究了辣椒红素有机回流萃取和超临界二氧化碳萃取,对比了萃取条件、色素得率、感官品质及产品稳定性,结果表明:超临界二氧化碳萃取法优于传统溶剂萃取法. 相似文献