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- E-ISSN 2288-8985
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Analysis of sorbic acid in tea-drink using isotope dilution liquid chromatography tandem mass spectrometry (ID-LC/MS/MS)
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2012, v.25 no.1, pp.25-32
https://doi.org/10.5806/AST.2012.25.1.025
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(2012). Analysis of sorbic acid in tea-drink using isotope dilution liquid chromatography tandem mass spectrometry (ID-LC/MS/MS). Analytical Science and Technology, 25(1), 25-32, https://doi.org/10.5806/AST.2012.25.1.025
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Abstract
Isotope dilution mass spectrometry (ID-MS) based on liquid chromatography tandem mass spectrometry (LC/MS/MS) was developed for the accurate determination of sorbic acid in tea-drink. An isotope analogue of sorbic acid, 13C2-sorbic acid, was obtained by custom synthesis. MS was operated in the negative mode with selected reaction monitoring (SRM) mode of [M-H]- → [M-CO2H]- channel at m/z 111 → 67 for sorbic acid and at m/z 113 → 68 for its isotope analogue. Chromatographic separation was accomplished with a C18column and an isocratic mobile phase of 55% of 50 mM ammonium acetate (pH 4.5) and 45% of methanol. Homogeneous reference materials were prepared for validation of this method, including repeatability and reproducibility tests, by fortifying tea-drink with sorbic acid in our laboratory. Repeatability and reproducibility studies showed that the ID-LC/MS method is a reliable and reproducible method which provides less than 3.8%of relative standard deviation (RSD) for the analysis of sorbic acid.
- keywords
- sorbic acid, ID-LC/MS, reference materials, expanded uncertainty
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