Stereoselective analysis of novel chiral fungicide pyrisoxazole in cucumber, tomato and soil under different application methods with supercritical fluid chromatography/tandem mass spectrometry

Pan, Xinglu; Dong, Fengxia; Xu, Jun; Liu, Xingang; Chen, Zenglong; Zheng, Yongquan

doi:10.1016/j.jhazmat.2016.03.005

Cited by 76 publications

(34 citation statements)

References 28 publications

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“…At the lowest spiked level (0.01 mg kg −1 ), the LOQ were below 0.0005 mg kg −1 . The matrix effect is usually regarded as a major drawback with LC—MS/MS in trace level analysis 27 . The ME of four pesticides in apple ranged 26.9% to 73.1% and exceeded 15%, so matrix-matched standard solution was used to compensate for ME 17 .…”

Section: Discussionmentioning

confidence: 99%

The effects of fruit bagging on residue behavior and dietary risk for four pesticides in apple

Nie

et al. 2018

Sci Rep

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In this study, the effects of fruit bagging on residue behavior and dietary risk for four pesticides (abamectin, imidacloprid, carbendazim and difenoconazole) in apple were investigated. The dissipation behavior of four pesticides were assessed after spraying on three occasions with the first spray at 2 months before harvest and the subsequent sprays at 10-day intervals at recommended doses of 5.4, 45, 135 and 975 g. a.i.ha−1, respectively. The dissipation experiment results demonstrated that apple fruit bagging reduced the initial deposits of four pesticides from 72.2% to 95.3%, prolonged the half-lives from 50.4% to 81.1%. The ultimate residues of abamectin, imidacloprid, carbendazim, and difenoconazole in bagged apple were far below the residues of unbagged apple. The dietary risks of four pesticides were assessed according to the ultimate residues and acceptable daily intakes (ADIs). The hazard quotient (HQ) were 0.013% to 43.415% for different pesticides. Fruit bagging reduced the HQ of four pesticides from 29.7% to 94.8%. Fruit bagging reduced the dietary risk of four pesticides in apple.

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Section: Discussionmentioning

confidence: 99%

The effects of fruit bagging on residue behavior and dietary risk for four pesticides in apple

Nie

et al. 2018

Sci Rep

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“…The resolution factor ( R s ) is determined from the software calculations using R s = 1.177( t R2 – t R1 )/( w 1 + w 2 ), where t R is the retention time (min), w is the peak width measured at half height, and subscripts 1–2 represent the former and the latter eluted enantiomers, respectively . The retention factors for each enantiomer, k 1 and k 2 , are calculated by the equation k = ( t R − t 0 )/ t 0 , where t 0 is the dead time under the experimental conditions, which is determined with 1,3,5‐ tert ‐butylbenzene.…”

Section: Methodsmentioning

confidence: 99%

Triticonazole enantiomers: Separation by supercritical fluid chromatography and the effect of the chromatographic conditions

Fan

Yan

et al. 2016

J. Sep. Science

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Enantiomeric pairs of triticonazole have been successfully separated by supercritical fluid chromatography coupled with a tris(3,5-dimethylphenylcarbamoyl) cellulose-coated chiral stationary phase in this work. The effects of co-solvent, dissolution solvent, flow rate, backpressure, and column temperature have been studied in detail with respect to retention, selectivity, and resolution of triticonazole. As indicated, the co-solvents mostly affected the retention factors and resolution, due to the different molecular structure and polarity. In addition, the dissolution solvents, namely, chloromethanes and alcohols, have been also important for enantioseparation because of the different interaction with stationary phase. Higher flow rate and backpressure led to faster elution of the triticonazole molecules, and the change of column temperature showed slight effect on the resolution of triticonazole racemate. Moreover, a comparative separation experiment between supercritical fluid chromatography and high performance liquid chromatography revealed that chiral supercritical fluid chromatography gave the 3.5 times value of R /t than high performance liquid chromatography, which demonstrated that supercritical fluid chromatography had much higher separation efficiency.

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“…The analytes co‐eluted on LC–MS/MS might be separated better on UHPSFC–MS/MS. As an alternative chromatographic approach, UHPSFC coupled to PDA or MS detector are widely used for the analysis of structural analogues , isomerides , enantiomeric, and diastereomeric mixtures . So far, to our knowledge, no method has been developed for the analysis of bisphenols using UHPSFC–MS/MS.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous determination of 17 bisphenols in polycarbonate by ultra‐high performance supercritical fluid chromatography with tandem mass spectrometry

Zhang

Ling

Zhang

et al. 2019

J of Separation Science

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A novel method was developed for the first time for the determination of 17 bisphenols by ultra-high performance supercritical fluid chromatography with tandem mass spectrometry. Under the optimal conditions, 17 bisphenols were separated successfully on a high density diol column in 9 min using methanol and carbon dioxide as mobile phase. 0.02% ammonium hydroxide/methanol v/v was used as the post-column compensation solvent to improve response of mass spectrometry.Linear relations of matrix-matched calibration curve were favorable over the selected concentration range of 1-100 μg/kg with correlation coefficients greater than 0.9981.The method limit of detection and limit of quantitation were 0.1-0.5 μg/kg and 0.5-2.5 μg/kg, respectively. The average recoveries at three spiked levels in polycarbonate were in the range of 81.8-114.5%. Intra-day and inter-day precisions for six replicates were below 15.0%. This method was successfully applied to determine bisphenols in polycarbonate. K E Y W O R D Sbisphenols, polycarbonate, supercritical fluid chromatography, tandem mass spectrometry 2578

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Stereoselective analysis of novel chiral fungicide pyrisoxazole in cucumber, tomato and soil under different application methods with supercritical fluid chromatography/tandem mass spectrometry

Cited by 76 publications

References 28 publications

The effects of fruit bagging on residue behavior and dietary risk for four pesticides in apple

The effects of fruit bagging on residue behavior and dietary risk for four pesticides in apple

Triticonazole enantiomers: Separation by supercritical fluid chromatography and the effect of the chromatographic conditions

Simultaneous determination of 17 bisphenols in polycarbonate by ultra‐high performance supercritical fluid chromatography with tandem mass spectrometry

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