Abstract
Ultraperformance convergence chromatography/tandem triple quadrupole mass spectrometry (UPC2-MS/MS) is a novel tool in separation science that combines the advantages of supercritical fluid chromatography with ultraperformance liquid chromatography/MS/MS technology. The use of nontoxic CO2 fluid and a postcolumn additive to complement MS/MS allows better control of analyte retention for chiral separation and high-sensitivity determination with different chiral stationary phases. This paper reports the stereoselective separation and determination of the chiral neonicotinoid sulfoxaflor in vegetables and soil by UPC2-MS/MS. Baseline resolution (Rs ≥ 1.56) of and high selectivity (LOQ ≤ 1.83 μg/kg) for the four stereoisomers were achieved by postcolumn addition of 1 % formic acid–methanol to a Chiralpak IA-3 using CO2/isopropanol/acetonitrile as the mobile phase at 40 °C, 2,500 psi, and for 6.5 min in electrospray ionization positive mode. Rearranged Van’t Hoff equations afforded the thermodynamic parameters ΔH ο and ΔS ο, which were analyzed to promote understanding of the enthalpy-driven separation of sulfoxaflor stereoisomers. The interday mean recovery, intraday repeatability, and interday reproducibility varied from 72.9 to 103.7 %, from 1.8 to 9.2 %, and from 3.1 to 9.4 %, respectively. The proposed method was used to study the pharmacokinetic dissipation of sulfoxaflor stereoisomers in soil under greenhouse conditions. The estimated half-life ranged from 5.59 to 6.03 d, and statistically nonsignificant enantioselective degradation was observed. This study not only demonstrates that the UPC2-MS/MS system is an efficient and sensitive method for sulfoxaflor stereoseparation, but also provides the first experimental evidence of the pharmacokinetic dissipation of sulfoxaflor stereoisomers in the environment.
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Abbreviations
- ABPR:
-
Pressure of automated backpressure regulator
- CSP:
-
Chiral stationary phase
- CS-SA:
-
Selector–selectand
- dSPE:
-
Dispersive solid-phase extraction
- EF:
-
Enantiomer fraction
- ESI:
-
Electrospray ionization
- MRL:
-
Maximum residue limit
- MRM:
-
Multiple reaction monitoring
- MWCNTs:
-
Multi-walled carbon nanotubes
- nAChR:
-
Nicotinic acetylcholine receptor
- Rs:
-
Resolution
- RSD:
-
Relative standard deviation
- SSE:
-
Signal suppression and enhancement
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This work was financially supported by the National Natural Science Foundation of China (NSFC, 31272071 and 31171879).
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Chen, Z., Dong, F., Xu, J. et al. Stereoselective separation and pharmacokinetic dissipation of the chiral neonicotinoid sulfoxaflor in soil by ultraperformance convergence chromatography/tandem mass spectrometry. Anal Bioanal Chem 406, 6677–6690 (2014). https://doi.org/10.1007/s00216-014-8089-9
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DOI: https://doi.org/10.1007/s00216-014-8089-9