二醇基柱高效液相色谱-蒸发光散射检测法测定饮料中的糖

采用二醇基柱分离、蒸发光散射检测法测定了饮料中的糖。比较了乙腈-水、二氯甲烷-甲醇两种流动相分析糖的特点。采用二氯甲烷-甲醇为流动相，果糖、葡萄糖、蔗糖、麦芽糖和棉子糖的峰面积与绝对进样量的标准曲线在绝对进样量为1.6μg-40μg时均具有良好的线性关系。该方法对上述5种糖的检测限分别为0.20μg，0.16μg,0.16μg,0.20μg和0.20μg。

Diol Column as Stationary Phase for High PerformanceLiquid Chromatographic Analysis of Carbohydrates inDrinks with Evaporative Light Scattering Detection

A high performance liquid chromatographic method with a diol column and evaporative light scattering detector (ELSD) was established for the direct analysis of fructose, glucose, sucrose, maltose and raffinose in mixture. A separation column (Lichrospher 100 Diol, 250 mm x 4.0 mm i.d., 5 microns, Hewlett-Packard, USA) and a guard column (Zorbax Rx-SIL, 12.5 mm x 4.6 mm i.d., 5 microns) were used. The mobile phase was a mixture of dichloromethane-methanol (3.2:1, volume ratio). Regression equations revealed linear relationship (correlation coefficients: 0.995-0.999) between the mass of carbohydrates injected and the peak area of carbohydrates detected by ELSD. The detection limits of ELSD (S/N = 3) were about 0.20 microgram for all carbohydrates. This system could be used for the routine analysis of simple carbohydrates in some common drinks on market.