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Enantioselective Behavior of Chiral Difenoconazole in Apple and Field Soil

Enantioselective Behavior of Chiral Difenoconazole in Apple and Field Soil

Weixia Chang, Jiyun Nie, Zhen Yan

Bull Environ Contam Toxicol. 2019 Sep;103(3):501-505.

PMID: 31214756

Abstract:

Difenoconazole is a universal chiral fungicide which is widely used in apples. Recently, it is still employed as racemic mixtures without distinction of the enantiomers, which may lead to an incomplete risk assessment. Here, we analyzed the stereoselective degradation of difenoconazole in apple fruits and open-field soil using an HPLC-UV system. Different trends were established in various apple varieties under identical environmental conditions. No significant differences were found in its enantioselectivity of the degradation processes applied in the field soil of an apple orchard. However, preferential dissipation of (2R,4R)-difenoconazole and (2R,4S)-difenoconazole was observed in Hanfu and Fuji apples, resulting in the enrichment of stereoisomers of (2S,4S)-difenoconazole and (2S,4R)-difenoconazole. Meanwhile, no significant enantioselectivity was detected in Huahong apples. The present study will provide additional information that contributes to the comprehensive evaluation of the risks posed by the application of chiral difenoconazole in agricultural production practices.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
CS353705	Difenoconazole-(4-chlorophenoxy-d4)			Price

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