Residue dissipation, transfer and safety evaluation of picoxystrobin during tea growing and brewing

文献类型： 外文期刊

第一作者： Zhang, Xinzhong

作者： Zhang, Xinzhong;Cui, Xuan;Wang, Xinru;Zhong, Qing;Zhou, Li;Luo, Fengjian;Wang, Fang;Wu, Luchao;Chen, Zongmao;Cui, Xuan;Zhong, Qing

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关键词： picoxystrobin; tea; maximum residue limit (MRL); safety evaluation; ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MS; MS)

期刊名称：JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE （ 影响因子：3.638； 五年影响因子：3.802 ）

ISSN： 0022-5142

年卷期： 2021 年 101 卷 1 期

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收录情况： SCI

摘要： BACKGROUND Picoxystrobin is a new osmotic and systemic broad-spectrum methoxyacrylate fungicide with a good control effect on tea anthracnose, so it has been proposed to spray picoxystrobin before the occurrence and onset of tea anthracnose during tea bud growth in order to protect them. However, there are few reports about the residue analysis method, field dissipation, terminal residue and risk assessment of picoxystrobin in tea. And there is no scientific and reasonable maximum residue limit of picoxystrobin in green tea. RESULTS A rapid and sensitive analysis method for picoxystrobin residue in fresh tea leaf, green tea, tea infusion and soil was established by UPLC-MS/MS. The spiked recoveries of picoxystrobin ranged from 73.1% to 111.0%, with relative standard deviations from 1.8% to 9.2%. The limits of quantitation were 20 mu g kg(-1)in green tea, 8 mu g kg(-1)in fresh tea leaves and soil and 0.16 mu g kg(-1)in tea infusion. The dissipation half-lives of picoxystrobin in fresh tea leaf and soil were 2.7-6.8 and 2.5-14.4 days, respectively. And the maximum residue of picoxystrobin in green tea was 15.28 mg kg(-1)with PHI at 10 days for terminal test. The total leaching rate of picoxystrobin during green tea brewing was lower than 35.8%. CONCLUSIONS According to safety evaluation, the RQc and RQa values of picoxystrobin in tea after 5 to 14 days for the last application were significantly lower than 1. Therefore, the maximum residue limit value of picoxystrobin in tea that we suggest to set at 20 mg kg(-1)can ensure the safety of tea for human drinking. (c) 2020 Society of Chemical Industry

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