The glycyrrhizic acid in glycyrrhiza leaching liquid was extracted by aqueous two-phase system.The orthogonal design is applied to investigate the effects of the process conditions on the recovery of glycyrrhizic acid...The glycyrrhizic acid in glycyrrhiza leaching liquid was extracted by aqueous two-phase system.The orthogonal design is applied to investigate the effects of the process conditions on the recovery of glycyrrhizic acid.Under the selected conditions,the PEG molecular mass was 2000,the ratio of leaching liquid to extractant was 1∶2 and the ratio of PEG to （NH4）2SO4 was 1∶1,the distribution coefficient of glycyrrhizic acid between top and bottom phase was 11.8 and the recovery of glycyrrhizic acid from glycyrrhiza leaching liquid was about 92.2%.展开更多
研究了银杏叶黄酮在聚丙二醇(PPG)400-(NH_4)_2SO_4双水相体系中的分配情况。探讨了单因素p H、PPG400质量分数、(NH_4)_2SO_4质量分数、料液比、温度、萃取时间对萃取率(Y%)和分配系数(K)的影响,并通过正交试验进一步优化双水相萃取条...研究了银杏叶黄酮在聚丙二醇(PPG)400-(NH_4)_2SO_4双水相体系中的分配情况。探讨了单因素p H、PPG400质量分数、(NH_4)_2SO_4质量分数、料液比、温度、萃取时间对萃取率(Y%)和分配系数(K)的影响,并通过正交试验进一步优化双水相萃取条件。结果表明,各个因素对Y%和K影响为PPG400质量分数>pH>(NH_4)_2SO_4质量分数>萃取时间>萃取温度>料液比。最佳萃取条件为p H 6、PPG400质量分数25%、(NH_4)_2SO_4质量分数15%、料液比1∶15、萃取温度40℃、萃取时间60min,黄酮萃取率达到98%以上。PPG400-(NH_4)_2SO_4双水相体系对银杏叶黄酮有较好的萃取效果。展开更多
文摘The glycyrrhizic acid in glycyrrhiza leaching liquid was extracted by aqueous two-phase system.The orthogonal design is applied to investigate the effects of the process conditions on the recovery of glycyrrhizic acid.Under the selected conditions,the PEG molecular mass was 2000,the ratio of leaching liquid to extractant was 1∶2 and the ratio of PEG to （NH4）2SO4 was 1∶1,the distribution coefficient of glycyrrhizic acid between top and bottom phase was 11.8 and the recovery of glycyrrhizic acid from glycyrrhiza leaching liquid was about 92.2%.
文摘研究了银杏叶黄酮在聚丙二醇(PPG)400-(NH_4)_2SO_4双水相体系中的分配情况。探讨了单因素p H、PPG400质量分数、(NH_4)_2SO_4质量分数、料液比、温度、萃取时间对萃取率(Y%)和分配系数(K)的影响,并通过正交试验进一步优化双水相萃取条件。结果表明,各个因素对Y%和K影响为PPG400质量分数>pH>(NH_4)_2SO_4质量分数>萃取时间>萃取温度>料液比。最佳萃取条件为p H 6、PPG400质量分数25%、(NH_4)_2SO_4质量分数15%、料液比1∶15、萃取温度40℃、萃取时间60min,黄酮萃取率达到98%以上。PPG400-(NH_4)_2SO_4双水相体系对银杏叶黄酮有较好的萃取效果。
