Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 65, Issue 38, Pages 8295-8301Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.7b02877
Keywords
pyrisoxazole; enantioselective degradation; vegetable; LC-MS/MS
Funding
- Special Fund for Agro-scientific Research in the Public Interest [201503107-12]
- National Natural Science Foundation of China [31501556]
- Zhejiang Provincial Natural Science Foundation of China [LQ15B050001, LQ14B070004]
- Special Fund for Public Projects of Zhejiang Province [2016C32042]
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Pyrisoxazole is a chiral fungicide with high sterilizing activity to the plant pathogenic bacteria and thus can be used for protecting the vegetables from gray mold, powdery mildew, and brown rot. The present work aimed to explore its stereoselective degradation in cabbage, pakchoi, and pepper samples. The enantioseparation and analysis on chiral column Lux Cellulose-3 based on liquid chromatography tandem mass spectrometry was developed coupled to the QuEChERS method. The recoveries of the stereoisomers in various vegetables ranged from 72.6 to 124% with RSD lower than 5.0%. Enantioselective dissipation of pyrisoxazole in vegetables displayed that (-)-A-pyrisoxazole was preferentially degraded versus (+)-A-pyrisoxazole hi all the vegetables. (+)-B-pyrisoxazole was preferentially degraded in cabbage, while there was no obvious enantioselectivity in pakchoi and pepper. Meanwhile, stereoselectivity analysis demonstrated that (+/-)-A-pyrisoxazole was degraded faster than (+/-)-B-pyrisoxazole in pakchoi and pepper, while there was no stereoselective degradation in cabbages.
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