顶空气相色谱法测定不同品种食用植物油中的溶剂残留量

建立了一种顶空-毛细管气相色谱快速测定不同品种食用植物油中溶剂残留量的方法。在80℃下振摇30 min后顶空进样,采用DB-624毛细管柱(0.53μm,0.25 mm,30 m)和氢火焰检测器测定,外标法定量。结果表明,在0~500μg范围内,六号溶剂的峰面积与其含量呈良好线性关系,相关系数为0.999,检出限为0.096 mg/kg,8种食用植物油平均加标回收率为87.5%~106.0%,相对标准偏差(RSD)为0.30%~3.05%。该方法简便快速、结果准确、重现性好,适合各种植物油中溶剂残留量的测定。

Determination of Solvent Resibue in Different Varieties of Ebible Vegetable Oils by Heabs Pace Gas Chromatography

An analytical method for fast determination for solvent residue in different edible vegetable oils by headspace gas chromatography was developed. Headspace sampling after shaking 30 min at 80 ℃,the analysis were then detected by FID detector after separation by DB-624(0.53μm,0.25 mm,30 m) chromatographic column. The result showed that the linear range was between 0~500μg and the linear correlation coefficient was 0.999. The detection limit was 0.096 mg/kg,and compared with the 8 varieties of edible vegetable oils,the average recoveries were between 87.50% and 106.00% with the relative standard deviations(RSD) of 0.30%~3.05%. The analysis method above has the advantages of simple operation,high degree of automation, good reproducibility,high sensitivity.