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Determination of benzoic acid and sorbic acid in vinegar by high performance liquid chromatography

Tianlan Xia

Abstract

Benzoic acid and sorbic acid in vinegar were extracted by distillation and determined by high perform liquid chromatography(HPLC).The calibration curves presented good linear relationship in the range of 0.25 mg/L～100 mg/L and the correlation coefficients were 0.9 999 and 0.9 998 for benzoic acid and sorbic acid respectively.Recoveries of benzoic acid and sorbic acid added were 95.0%～105.2%.The opposite deviation of testing results is 2.46%～3.45%.Detection limit of the method for benzoic acid and sorbic acid was 0.5 mg/L.

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Key concepts: Sorbic acid, Benzoic acid, Chemistry, Chromatography, High-performance liquid chromatography, Detection limit, Calibration curve, Organic chemistry