期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 69, 期 51, 页码 15512-15520出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.1c03852
关键词
chiral diniconazole; absolute configuration; SFC-MS/MS; enantioselective dissipation; risk assessment
资金
- Science Technology Project of Zhejiang Province [2020C02023]
- National Key Research and Development Program of China [2018YFC1603004]
- National Natural Science Foundation of China [22006137]
- Natural Science Foundation of Zhejiang Province [LQ21C140002]
- project of State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agroproducts [2010DS700124-ZZ2001, 2010DS700124-ZZ2009]
A new SFC-MS/MS method was developed to study the degradation characteristics and enantioselectivity of chiral diniconazole in four fruits, revealing preferential degradation of S-diniconazole.
Chiral diniconazole is a widely used triazole fungicide, while its enantioselective behaviors in fruits have not been reported. In this article, the absolute configuration was confirmed. A fast supercritical fluid chromatography-tandem mass spectrometry (SFC-MS/MS) method was developed for the chiral separation and enantioselective study of diniconazole in four kinds of fruits. The residual concentrations gradually decreased with time in four kinds of fruits after applying diniconazole. The dissipation half-lives of R-diniconazole and S-diniconazole were in the range of 5.3-7.9 and 2.5-7.1 days respectively, and S-diniconazole was degraded preferentially. The residue concentrations were lower than the EU's MRL (0.01 mg/kg) on the 40th (harvest time), 30th, and 10th day in pear, jujube, and apple, respectively. But, in peach, residue concentrations were still higher than the MRL after 60 days and the ratio of R/S was 2.2. These results could be helpful for the reasonable use and risk assessment of chiral diniconazole.
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