XÁC NHẬN GIÁ TRỊ SỬ DỤNG CỦA PHƯƠNG PHÁP UPLC/MS/MS ĐỂ PHÂN TÍCH HÀM LƯỢNG TINOPAL CBS-X TRONG GẠO

Tóm tắt

A method based on ultra high performance liquid chromatography coupled with tandem mass spectrometry
(UPLC/MS/MS) as development for simple and rapid determination of the residues of tinopal CBS - X in
rice products. The sample were extracted by 4 % phosphoric acid in acetonitrile and then analyzed in
multiple reaction monitoring (MRM) mode. The mobile phase was composed of solvent A (water) and
solvent B (acetonitrile). Gradient program was performed as follows: 0 - 0.5 min, 80% A; 0.5 - 4.0 min, 20%
A and at initial condition. Total run time is 8 min. The flow rate was settled at 0.3 ml/min with an injection
volume of 10 μl. Under the optimized conditions, the linear range for tinopal CBS - X is 1.0 – 10 ng/g, the
linear correlation coefficients are more than 0.99. The limits of quantification of tinopal CBS - X are 2.20
ng/g. The recoveries of tinopal CBS - X ranged from 93.50 % - 118.3 % with relative standard deviation
(RSD) between 0.96 – 12.06 %. The method was validated according to the Directive 2002/657/EC and
subsequently applied to 18 samples of rice products.