Enantioselective Degradation of (2RS,3RS)-Paclobutrazol in Peach and Mandarin Under Field Conditions

文献类型： 外文期刊

第一作者： Wang, Xiangyun

作者： Wang, Xiangyun;Qi, Peipei;Yang, Guiling;Wang, Xinquan;Zhang, Hu;Xu, Hao;Wang, Zhiwei;Wang, Qiang;Wang, Xiangyun;Qi, Peipei;Yang, Guiling;Wang, Xinquan;Zhang, Hu;Xu, Hao;Wang, Zhiwei;Wang, Qiang;Wang, Xiangyun;Qi, Peipei;Yang, Guiling;Wang, Xinquan;Zhang, Hu;Xu, Hao;Wang, Zhiwei;Wang, Qiang

作者机构：

关键词： HPLC–MS/MS;plant growth regulator;paclobutrazol;enantioselective degradation

期刊名称：CHIRALITY （ 影响因子：2.437； 五年影响因子：2.204 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： In this study we investigated the enantioselective degradation of (2RS,3RS)-paclobutrazol in peach and mandarin fruits under field conditions after foliar treatment at 500 mg active ingredient/L using a Lux Cellulose-1 chiral column on a reverse-phase liquid chromatography–tandem mass spectrometry system. Degradations of paclobutrazol in both fruits followed first-order kinetics, with half-lives of about 9 days. Initial deposits were 1.63 mg/kg on peach and 1.99 mg/kg on mandarin; terminal concentrations were lower than 0.05 mg/kg, which was acceptable inmost cases. As anticipated, paclobutrazol levels in peels ofmaturemandarin were about 6.3 times higher than in pulp, indicating the potential risk of peel consumption. We also observed that paclobutrazol degradation in mature mandarin was relatively slow, indicating it might not be efficient enough to hold mandarin fruits on trees for lowering paclobutrazol concentrations. Significant enantioselectivity was observed: the (2R,3R)-enantiomer was preferentially degraded in mandarin (whole fruit, peels, and pulp) but enriched in peach. Because of its more rapid degradation in mandarin and the lower levels observed in pulp compared with peels, potential endocrine-related side effects due to the (2R,3R)-enantiomer pose less of a risk in mandarin than in peach.

分类号： O641

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