Development of a LC-MS/MS method for the simultaneous determination of sorbic acid, natamycin and tylosin in Dulce de leche

卷:211

Molognoni, Luciano ; Valese, Andressa Camargo ; Lorenzetti, Angelica ; Daguer, Heitor ; Lindner, Juliano De Dea

Univ Fed Santa Catarina

关键词: Conformity assessment;    Method validation;    Uncertainty measurement;    Food preservatives;    Veterinary drugs;   

DOI  :  10.1016/j.foodchem.2016.05.105

学科分类：食品科学和技术

【 摘 要 】

A simple extraction, rapid routine method for the simultaneous determination of sorbic acid, natamycin and tylosin in Dulce de leche, a traditional South American product, by liquid chromatography-tandem mass spectrometry has been developed and fully validated. The limits of detection were set to 24.41 mg kg(-1) (sorbic acid), 0.10 mg kg(-1) (natamycin) and 2 mu g kg(-1) (tylosin). Recoveries ranged from 95% to 110%. Proportionally, internal standardization was more efficient than external standard, resulting in a smaller measurement of uncertainty. In total, 35 commercial samples from Brazil, Argentina and Uruguay have been assessed. The proposed method was tested on other dairy desserts, demonstrating to be versatile. Although tylosin was not detected in any sample, a high rate of non-compliance was found, with 67.39% of samples above the maximum allowed for sorbic acid and a maximum concentration of 2105.36 +/- 178.60 mg kg(-1). In two samples, natamycin was irregularly found. (C) 2016 Elsevier Ltd. All rights reserved.