Analysis of isobaric pesticides in pepper with high-resolution liquid chromatography and mass spectrometry: complementary or redundant?

Abstract Text

Five isobaric pesticides are analyzed in red pepper (Capsicum annuum) by high-resolution chromatography (100,000 theoretical plates/meter) and high-resolution mass spectrometry (resolving power > 25000) to test whether these methods are redundant or complementary when using MS/MS analysis. The five compounds are hexaconazole, isazophos, isoxathion, kresoxim-methyl, and triazophos, with an isobaric mass of m/z 314 and 336. Red pepper was chosen as a complex vegetable matrix with more than 4000 adducted ions (MH(+) and MNa(+)). High-resolution chromatography was found to be a valuable tool to separate the isobaric pesticides from one another, whereas the high resolution of the mass spectrometer separated the matrix ions of red pepper easily from the pesticides due to differences in their mass defect. The combination of techniques is especially valuable in MS/MS analysis because of interfering precursor and fragment ions of the isobaric pesticides rather than the complex pepper matrix--a nonintuitive result.

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2016-09-08 10:11:22

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Citation:- Thurman EM, Ferrer EM, Zavitsanos EM, Zweigenbaum EM, .Analysis of isobaric pesticides in pepper with high-resolution liquid chromatography and mass spectrometry: complementary or redundant? Journal of agricultural and food chemistry 2013-Mar;61()2340-7 DOI:10.1021/jf304642g

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Details of Journal

Journal Title - Journal of agricultural and food chemistry

ISSN - 1520-5118

Volume - 61

Issue - 10

Publish date - 2013-Mar

Language - eng

Country - United States


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