HPLC法检测明绿萌动过程中牡荆素和异牡荆素含量变化规律

[目的]为更好地利用安徽明绿资源,开展了绿豆萌动试验中牡荆素和异牡荆素的含量变化规律及其高效液相色谱法(HPLC)检测方法研究。[方法]对安徽特产明绿进行萌动40 h,每4 h取样1次,并用HPLC方法对样品中牡荆素、异牡荆素含量进行检测。[结果]萌动过程中牡荆素、异牡荆素基本上处于波动下降趋势,但在萌动8 h时含量最高,分别为0.57、1.02 mg/g,在16 h时含量最低,并且异牡荆素含量是牡荆素含量的2倍左右。[结论]HPLC法检测牡荆素、异牡荆素方法可靠,明绿萌动过程中,8 h时牡荆素、异牡荆素含量较高。     

绿豆芽中异黄酮类成分提取工艺的优化及含量测定

[目的]确定绿豆芽中黄酮类成分的最佳提取工艺及绿豆发芽过程中大豆异黄酮类成分牡荆素和异牡荆素的变化趋势。[方法]采用正交试验优化绿豆中异黄酮类成分的提取工艺,用HPLC法测定牡荆素和异牡荆素在绿豆发芽过程中（0～6 d）的含量。[结果]绿豆芽中异黄酮类成分的最佳提取工艺为：提取次数1次,提取时间90 min,提取溶剂为50%乙醇,料液比为1∶50。绿豆发芽第4天,牡荆素和异牡荆素的含量最高,但均低于其在绿豆中的含量。[结论]该研究为绿豆及绿豆芽的开发和利用提供了良好的理论基础。     

Potential insulin secretagogue effects of isovitexin and swertisin isolated from Wilbrandia ebracteata roots in non-diabetic rats

The antihyperglycemic effect and mechanism of action of extracts, fractions and compounds from Wilbrandia ebracteata was studied. The crude extract reduced the glycemia, increased glycogen content and serum insulin in hyperglycemic rats. Also, a significant effect was observed with the n-butanol and metanol subfraction. However, the antihyperglycemic effect of the n-butanol fraction was not observed in diabetic rats. The C-glycosylflavones isovitexin and swertisin showed a strong antihyperglycemic action compared with the extracts and fractions. These results show that the extracts, fractions, and isolated C-glycosylflavones have an antihyperglycemic action that was reinforced by the stimulation on in vivo insulin secretion.