气相色谱法测定食品中丙酸钠 丙酸钙方法的改进

Improvement Methods of Gas Chromatography to Determine Calcium Propionate and Sodium Propionate in Food

建立使用填充柱（填装涂布5%（m/m）DEGS＋1%磷酸固定液的（60∽80目）Chromosorb W/AW DMCS,2 m＊3 mm）代替使用昂贵的国外Porapak系列高分子聚合物色谱柱测定食品中丙酸钠、丙酸钙的气相色谱法。结果：本法在丙酸盐浓度0∽250 mg/L范围内呈良好线性关系,相关系数r大于0.999,方法平均回收率95%--105%,进样精密度实验的RSD（%）值均小于3.0,方法的检出限为0.012 g/kg,满足检测要求。

A method was established to determine calcium propionate in several foods by gas chromatography. The com- pound was separated by a packed column （5%（m_/m）DEGS＋1% phosphoric acid （60-80）Chromosorb W/AW DMCS, 2m＊3mm）, instead of using expensive foreign Porapak series polymer chromatographic column. The experimental results showed that the linear range of the method was 0mg/L-250 mg/L with the correlation coefficients （r） above 0.999. The average recovery were in the range of 95%-105%, and the relative standard deviation was less than 3.0%. The detection limit was 0.012g / kg, could be applied to determine propionic acid content in food.