高效液相色谱蒸发光散射检测器测定保健食品中果糖、葡萄糖、蔗糖、麦芽糖、乳糖和木糖

摘要

目的：建立高效液相色谱-蒸发光散射法同时测定保健食品中果糖、葡萄糖、蔗糖、麦芽糖、乳糖、木糖的方法。方法采用Sepax HP-Amino(300 mm×4.6 mm,5μm)色谱柱,流动相为乙腈-水(70∶30),流速为1.0 mL·min-1,柱温为35℃；使用蒸发光散射检测器检测,漂移管的温度105℃,载气流速2.2 mL·min-1。结果果糖、葡萄糖、蔗糖、麦芽糖、乳糖和木糖进样量分别在1.0328~10.328μg (r=0.9989),1.5085~15.085μg(r=0.9997),1.0199~10.199μg(r=0.9998),1.5094~30.187μg(r=0.9995),2.9992~59.984μg (r=0.9996),5.05~50.5μg (r=0.9996)范围内与峰面积的对数呈现良好的线性关系；平均回收率(n=6)分别为96%,105%,103%,95%,98%和99%；重复性实验,6种糖含量的 RSD(n=6)分别为2.95%,2.52%,1.75%,1.62%,2.23%和1.85%。结论该方法操作简单、快速、准确,适用于多种保健食品中糖的分析。%Obj ective A method for the simultaneous determination of 6 sugars such as fructose,glucose,sucrose,maltose,lactose and xylose in functional foods was described by using high performance liquid chromatography with evaporative light scattering de-tection(ELSD).Methods Sepax HP-Amino column (300 mm×4.6 mm,5μm)was adopted,the mobile phase was composed of acetonitrile-water(70∶30)at a flow rate of 1.0 mL·min-1 ,and the column temperature was set at 35 ℃;The conditions of ELSD were as follows:the temperature of the drifting tube 105 ℃,the flow rate of nebulizer gas 2.2 mL·min-1 .Results The logarithm of samples size of fructose,glucose,sucrose,maltose,lactose and xylose had good linearity with the logarithm of peak ar-ea in the ranges of 1.032 8-10.328μg(r=0.998 9),1.508 5-15.085μg (r=0.999 7),1.019 9-10.199μg(r=0.999 8),1.509 4-30.187μg (r=0.999 5),2.999 2-59.984μg (r=0.999 6),and 5.05-50.5μg (r=0.999 6),respectively;The average recoveries were 96%,105%,103%,95%,98% and 99%,respectively;Repeatability experiments showed that RSD values of their contents were 2.95%,2.52%,1.75%,1.62%,2.23% and 1.85%,respectively.Conclusion This method was simple,fast,and accurate for the analysis of fructose,glucose,sucrose,maltose,lactose and xylose in functional foods.