| 杨 静, 马小龙, 魏新举, 王晓菁, 苟春林*.螺虫乙酯及其代谢物在枸杞上的残留行为、储藏稳定性及膳食风险评估[J].植物保护,2025,51(4):266-274. |
| 螺虫乙酯及其代谢物在枸杞上的残留行为、储藏稳定性及膳食风险评估 |
| Residue behavior, storage stability and dietary risk assessment of spirotetramat in Lycium |
| 投稿时间：2024-06-27 修订日期：2024-12-30 |
| DOI：10.16688/j.zwbh.2024348 |
| 中文关键词: 枸杞 螺虫乙酯 稳定性 残留 膳食风险评估 |
| 英文关键词:Lycium spirotetramat stability residue dietary risk assessment |
| 基金项目:“十四五”农业高质量发展和生态保护科技创新示范项目（NGSB-2021-5-03）；2022宁夏回族自治区科技创新领军人才项目（2022GKLRLX09） |
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| 中文摘要: |
| 为明确螺虫乙酯在枸杞Lycium上的残留特性, 在我国宁夏、新疆、河北和青海4地开展了22.4%螺虫乙酯悬浮剂的田间残留试验。优化了净化条件, 建立了枸杞中螺虫乙酯及其代谢物残留的液相色谱-三重四极杆串联质谱检测方法。在0.01~1.00 mg/kg范围内, 螺虫乙酯及其代谢物标准曲线方程的线性关系良好, r＞0.999, 基质效应为14.3%~107.1%; 方法定量限为0.01 mg/kg。在0.01~1.00 mg/kg的添加范围内, 螺虫乙酯及其代谢物在枸杞上的平均回收率为71.8%~106.2%, 相对标准偏差(relative standard deviation, RSD)为1.9%~9.1%。12个月内, 螺虫乙酯及其代谢物在枸杞上的降解率均低于30%, 稳定性试验结果表明螺虫乙酯及其代谢物在枸杞上是稳定的。枸杞中螺虫乙酯的残留消解动态符合一级动力学模型, 在新疆与宁夏的降解半衰期为1.5 d和2.3 d。最终残留结果显示，施药1次, 安全间隔期为7 d时, 螺虫乙酯及其代谢物的残留量为0.01~0.24 mg/kg, 低于我国制定的临时最大残留限量值5 mg/kg。风险评估结果表明, 螺虫乙酯在枸杞上的风险商为26.3%, 风险处于可接受水平。 |
| 英文摘要: |
| To investigate the residue behavior and underlying risks of spirotetramat in Lycium, field residue trials of 22.4% spirotetramat suspension concentrate (SC) were conducted in four provinces of China: Ningxia, Xinjiang, Hebei and Qinghai. A liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed for detecting spirotetramat and its metabolites, with optimized purification procedures. Within the concentration range of 0.01-1.00 mg/kg, the calibration curves showed good linearity (r>0.999), and matrix effects ranged from 14.3% to 107.1%. The limit of quantitation was 0.01 mg/kg. At spiking levels between 0.01-1.00 mg/kg, the average recoveries were 71.8%-106.2%, with the relative standard deviations (RSD) between 1.9% and 9.1%. After 12 months of storage, the degradation rates of spirotetramat and its metabolites in berries of Lycium were all below 30%, indicating good storage stability. The dissipation of spirotetramat followed a first-order kinetic model, with half-lives in Xinjiang and Ningxia of 1.5 d and 2.3 d. The final residual results showed that following a single application and a 7-day pre-harvest interval, the residual quantity of spirotetramat and its metabolites in Lycium was 0.01-0.24 mg/kg, which was lower than China’s provisional maximum residue limit of 5 mg/kg. Dietary risk assessment showed a risk quotient of 26.3%, indicating that dietary exposure to spirotetramat through Lycium is within acceptable safety margins. |
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