title: [Determination of kojic acid in foods using high performance liquid chromatography-tandem mass spectrometry].
abstract: The quantification method for the determination of kojic acid in foods using high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) was developed. For solid samples, the kojic acid was extracted with acetonitrile; for liquid samples, they were diluted with water, then deproteinized by the deposition with zinc acetate and potassium ferrocyanide. The analytes were determined by HPLC-MS/MS on a C18 column with 5 mmol/L ammonium acetate/formic acid solution as mobile phases. The analysis of kojic acid was performed under selected reaction monitoring (SRM) mode by selecting one parent ion and two daughter ions as qualitative ions with [13C6]-kojic acid as the internal standard, and the most abundant daughter ion as quantitative ion. The limits of quantification (S/N > 10) were 0.1 mg/kg for the solid samples, and 2.5 mg/kg for the liquid samples. The good linearity (r > 0.99) was achieved for the target compound over the range of 0.1 - 2.0 mg/L. The recoveries at three levels for kojic acid were from 72.6% to 114% with the relative standard deviations no more than 11.4%. The method is simple and practical, and can be applied to most of matrices which may contain kojic acid as food additives. It can meet the qualitative and quantitative requirements for import and export foods.
authors.affiliation: Animal, Plant and Food Inspection Center of Jiangsu Entry-Exit Inspection and Quarantine Bureau, Nanjing 210001, China. huang-juan@yeah.net
authors.forename: Juan
authors.initials: J
authors.lastname: Huang
authors.forename: Yan
authors.initials: Y
authors.lastname: Liu
authors.forename: Tao
authors.initials: T
authors.lastname: Ding
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Zhang
authors.forename: Huilan
authors.initials: H
authors.lastname: Chen
authors.forename: Chongyu
authors.initials: C
authors.lastname: Shen
authors.forename: Bin
authors.initials: B
authors.lastname: Wu
authors.forename: Wen
authors.initials: W
authors.lastname: Niu
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005503:Food Additives / Q000032:analysis*; D005506:Food Contamination / Q000032:analysis*; D011753:Pyrones / Q000032:analysis*; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D005503:Food Additives; D011753:Pyrones; C011890:kojic acid