Abstract
A method for simultaneous enantioselective determination of fenarimol and nuarimol in apple, grape, cucumber, tomato, and soil was developed using liquid chromatography–tandem mass spectrometry. The enantioseparation results of the two fungicides through three different cellulose-based chiral columns are discussed. The influence of column temperature on the resolution of the enantiomers of the two fungicides was examined. Complete enantioseparation of the two fungicides’ enantiomers was obtained on a cellulose tris(4-methylbenzoate) column (Lux Cellulose-3) at 25 °C using methanol and 0.1 % formic acid solution (80:20, v/v) as mobile phase. The linearity, matrix effect, recovery, and precision were evaluated. Good linearity was obtained over the concentration range of 1–500 μg L−1 for each enantiomer in the standard solution and sample matrix calibration solution. There was no significant matrix effect in apple, grape, cucumber, or tomato samples, but signal suppression was typically observed with the soil extracts. The mean recoveries, repeatability, and reproducibility were 76.5–103 %, 2.1–9.0 %, and 4.2–11.8 %, respectively. The limit of quantification for enantiomers of the two fungicides in fruits, vegetables and soil was 5 μg kg−1. Moreover, the absolute configuration of the enantiomers of fenarimol and nuarimol was determined from a combination of experimentally determined and predicted electronic circular dichroism spectra.
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Acknowledgements
The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (no. 21107094), the National High Technology R&D Program of China (The 863 Program, no. 2011AA100806), and the Fundamental Research Funds for the Central Universities.
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Zhang, H., Wang, X., Zhuang, S. et al. Enantioselective separation and simultaneous determination of fenarimol and nuarimol in fruits, vegetables, and soil by liquid chromatography–tandem mass spectrometry. Anal Bioanal Chem 404, 1983–1991 (2012). https://doi.org/10.1007/s00216-012-6325-8
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DOI: https://doi.org/10.1007/s00216-012-6325-8