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目的:建立一种测定食品中防腐剂山梨酸、苯甲酸的新方法。方法:利用HP-INNWAX毛细管气相色谱法测定食品中山梨酸、苯甲酸。结果:在所给出的实验条件下,方法的回收率为99%;山梨酸、苯甲酸含量在150μg/ml时,RSD分别为5.8%和4.3%(n=6);在0μg/ml～200μg/ml范围内方法校准曲线相关系数r分别为0.9999和0.9993;方法的最低检测浓度分别为13 mg/kg,33 mg/kg。结论:本法准确、可靠、简便、快速、检出限低,适用各类食品中山梨酸、苯甲酸的同时分析测定,完全能够取代GB/T5009.29-2003的第一法。
Objective: To establish a new method for determination of sorbic acid and benzoic acid in food. Methods: Determination of sorbic acid and benzoic acid in food by HP-INNWAX capillary gas chromatography. Results: Under the experimental conditions given, the recovery was 99%. The RSD of sorbic acid and benzoic acid at the concentration of 150μg / ml was 5.8% and 4.3% respectively (n = 6) The correlation coefficients r of calibration curve of method 200μg / ml were 0.9999 and 0.9993, respectively. The minimum detectable concentration was 13 mg / kg and 33 mg / kg, respectively. Conclusion: This method is accurate, reliable, simple, fast, low detection limit, applicable to all kinds of food sorbic acid, benzoic acid simultaneous analysis and determination, can completely replace the first method of GB / T5009.29-2003.