钟方丽,王文姣,2,王晓林*,姚丽丽
(1.吉林化工学院化学与制药工程学院,吉林吉林 132022;2.吉林大学化学学院,吉林长春130012)
双水相提取黄芪茎总黄酮及其抗氧化活性研究
钟方丽1,王文姣1,2,王晓林1*,姚丽丽1
(1.吉林化工学院化学与制药工程学院,吉林吉林 132022;2.吉林大学化学学院,吉林长春130012)
试验探索了微波协同双水相法提取黄芪茎总黄酮的工艺条件并对其体外抗氧化活性进行研究。采用单因素试验和正交试验对黄芪茎中总黄酮的提取工艺进行优化;通过对超氧阴离子自由基的清除率和还原力对其抗氧化活性进行评价。结果表明,微波协同双水相提取黄芪茎总黄酮的最佳工艺条件为料液比1∶27,微波功率400 W,醇水比0.67,提取时间7 min,硫酸铵质量浓度0.27 g/mL;黄芪茎总黄酮提取液的抗氧化活性随提取液用量的增加而逐渐增强,其对超氧阴离子自由基的清除率可以达到82%,而且具有较强的还原力。
黄芪茎;总黄酮;双水相;抗氧化
[Abstract]The test was conducted to study the extraction technology of total flavonoids in astragalus stems with aqueous two-phase assisted with microwave method and its antioxidant ability.The single factor and orthogonal tests were applied to optimize the extraction technology of total flavonoids in astragalus stems.The antioxidant ability of the extracts was evaluated according to the clearance ratio and reducing power to superoxide anion free radical.The optimum extraction technology of total flavonoids in astragalus stems with aqueous two-phase assisted with microwave method was obtained. The ratio between material and solvent,the microwave power,the ratio between ethanol and water,extraction time,mass concentration of ammonium sulfate were 1∶27,400 W,0.67,7 min,0.27 g/mL,respectively.The clearance ratio of the total flavonoids extraction solution of astragalus stems to superoxide anion free radical could reach 82%,antioxidant activity of which gradually enhanced with the increase of the amount of the extraction solution.
[Key words]astragalus stems;total flavonoids;aqueous two-phase;antioxidant activity
黄芪是我国传统的中草药材。研究表明,黄酮是黄芪中一类重要的活性成分,具有调节免疫、抗炎、抗突变、清除自由基等多种活性作用(陈建真等,2009)。黄芪的传统应用部位是根部,但黄芪茎的产量远远大于黄芪根(杨春树,1997)。目前,我国大部分黄芪茎被废弃,未被有效利用,资源浪费严重(毕志明等,2007)。研究表明,饲料中添加黄芪茎粉后,对鸡、兔具有明显的促生长和增强免疫能力作用,能够提高畜禽的生产性能(王凤霞等,2009)。双水相体系是一种新型的分离技术,具有工艺条件温和、生物亲和性好等优点,已广泛应用于天然产物中活性物质的分离 (欧阳玉祝等,2011)。……