离子色谱-柱切换技术同步测定饮料中的三氯蔗糖、葡萄糖、果糖和蔗糖

建立了一种离子色谱-柱切换-安培检测技术同步测定饮料中三氯蔗糖、葡萄糖、果糖和蔗糖的方法。以CarboPac PA10阴离子交换保护柱和分析柱进行分离，用水和250 mmol/L NaOH梯度淋洗，脉冲安培检测。弱保留糖类在25 mmol/L NaOH流动相淋洗下分离检测，通过柱切换将保护柱切换至分析柱后，同时切换至250 mmol/L NaOH淋洗，三氯蔗糖仅通过较短的保护柱分离，4种糖类能够得到同步检测。4种糖类在0.01~20 mg/L范围内有良好的线性关系和较低的检出限，重复性好，样品测定的回收率分别为90.38%~102.88%（三氯蔗糖）、95.56%~102.75%（葡萄糖）、101.66%~114.33%（果糖）和105.03%~106.49%（蔗糖）。该方法可广泛应用于食品中强保留物质的测定。

Simultaneous determination of sucralose,glucose, fructose and sucrose in beverage by ion-exchange chromatography with column-switching

A new method of simultaneous determination of sucralose, glucose, fructose and sucrose in beverage has been established using ion-exchange chromatography coupled with column-switching and pulsed amperometric detection. A CarboPac PA10 guard column and a CarboPac PA10 analytical column, along with the mixtures of pure water and 250 mmol/L NaOH solution in different ratio acting as mobile phase in the gradient elution were used in the pulsed amperometric detection. After the separation and detection of saccharides with weak retention through elusion with 25 mmol/L NaOH, we switched the guard column to analytical column, in which sucralose can be separated through the comparatively short guard column while the four saccharides can be detected simultaneously. In this study, four saccharides had good linear relationships in 0.01-20 mg/L and the recoveries were 90.38%-102.88% (sucralose), 95.56%-102.75% (glucose), 101.66%-114.33% (fructose), 105.03%-106.49% (sucrose) with high sensitivity and good reproducibility. This method can be widely used in the determination of components with strong retention in food.