NDLI: Enantioselective determination of the chiral pesticide isofenphos-methyl in vegetables, fruits, and soil and its enantioselective degradation in pak choi using HPLC with UV detection

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Enantioselective determination of the chiral pesticide isofenphos-methyl in vegetables, fruits, and soil and its enantioselective degradation in pak choi using HPLC with UV detection

Content Provider	Springer Nature Link
Author	Gao, Beibei Zhang, Qing Tian, Mingming Zhang, Zhaoxian Wang, Minghua
Copyright Year	2016
Abstract	An enantioselective method for the simultaneous determination of the chiral pesticide isofenphos-methyl in vegetables, fruits, and soil has been established using high-performance liquid chromatography with UV detection. The complete enantioseparation was conducted by reversed-phase liquid chromatography with a cellulose-tris-(4-methylbenzoate) chiral stationary phase (CSP) (Lux Cellulose-3). The effects of different mobile phase compositions, temperatures, and flow rates on enantioseparation were also investigated. The experimental and calculated electronic circular dichroism spectra indicate that the first peak is (S)-(+)-isofenphos-methyl and the second peak is (R)-(−)-isofenphos-methyl. Alumina-A and Florisil solid-phase extraction (SPE) columns were used to clean up for vegetable, fruit, and soil samples. The mean recoveries of the two enantiomers ranged from 83.2 to 110.9 % with intra-day relative standard deviations (RSDs) from 3.2 to 10.8 % and inter-day RSDs from 3.6 to 10 %. Good linearity (≥0.9992) was obtained for the two enantiomers in all matrix-matched calibration curves in the range of 0.25 to 20 mg L−1. The limit of detection for two enantiomers in six matrices was in the range of 0.008 to 0.011 mg kg−1, and the limit of quantification was estimated to range from 0.027 to 0.037 mg kg−1. The results indicated that this method was a convenient and dependable approach for the simultaneous determination of isofenphos-methyl enantiomers in food and environmental samples. The stereoselective degradation of isofenphos-methyl in pak choi has shown that the (R)-(−)-isofenphos-methyl isomer (half-life t 1/2 = 2.2 days) degraded faster than the (S)-(+)-isomer (t 1/2 = 1.9 days). Graphical Abstract The enantioselective determination and enantioselective degradation of the chiral pesticide isofenphos-methyl
Starting Page	6719
Ending Page	6727
Page Count	9
File Format	PDF
ISSN	16182642
Journal	Analytical and Bioanalytical Chemistry
Volume Number	408
Issue Number	24
e-ISSN	16182650
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-07-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Isofenphos-methyl HPLC Enantioselective determination Absolute configuration Chiral separation mechanism Stereoselective degradation Analytical Chemistry Biochemistry Laboratory Medicine Characterization and Evaluation of Materials Food Science Monitoring/Environmental Analysis
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry Biochemistry

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