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Anaerobic Degradation of [14C]Methiozolin under Aquatic Sediment Conditions.
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2019-11-25 , DOI: 10.1021/acs.jafc.9b05308 Jong-Hwan Kim 1 , Jong-Su Seo 1 , Ji-Young An 1 , Young-Sang Kwon 1 , Sung-Gil Choi 1 , Ki-Hwan Hwang 2 , Suk-Jin Koo 2 , Jeong-Han Kim
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2019-11-25 , DOI: 10.1021/acs.jafc.9b05308 Jong-Hwan Kim 1 , Jong-Su Seo 1 , Ji-Young An 1 , Young-Sang Kwon 1 , Sung-Gil Choi 1 , Ki-Hwan Hwang 2 , Suk-Jin Koo 2 , Jeong-Han Kim
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The fate of methiozolin under anaerobic conditions was investigated in clay loam with a high organic carbon content and sandy loam with a low carbon content using [dihydroisoxazole ring-14C] and [phenyl-14C] radiolabels. The sediment/water ratio was 1:3 based on the dry weight:volume (w/v) ratio; the incubations lasted up to 355 days after the treatment (DAT) and were performed in the dark at 20.4 ± 0.7 °C. The overlying water flow-through systems consisted of glass vessels containing sediment with traps for [14C]carbon dioxide and [14C]volatiles. The samples were collected and analyzed at 0, 3, 7, 14, 50, 100, 200, and 355 DAT. The water and sediment samples were extracted with solvent systems, centrifuged, concentrated, and analyzed by liquid scintillation counting and a high-performance liquid chromatography (HPLC) system equipped with a flow scintillation analyzer. Following extraction, the sediments were air-dried, and the subsamples were combusted. [14C]Methiozolin was degraded in the water phase and partitioned rapidly into the sediments, where it was further degraded to other metabolites, which were identified by HPLC and liquid chromatography- or gas chromatography-tandem mass spectrometry (MS/MS) with authentic standards. The dissipation of methiozolin from the overlying water was rapid (with half-lives of 1.1-1.8 and 3.6-4.9 days in the clay loam and sandy loam, respectively). However, methiozolin dissipation from the sediment phase and the whole system was much slower than from the water phase (with half-lives of 122.0-220.0 and 110.0-130.0 days in the sediment phase of the clay loam and sandy loam and 116.0-166.0 and 70.8-85.7 days in the whole system of the clay loam and sandy loam, respectively).
中文翻译：
在水生沉积条件下厌氧降解[14C]甲硫唑啉。
使用[dihydroisoxazole ring-14C]和[phenyl-14C]放射性标记，在有机碳含量高的粘土壤土和碳含量低的沙质壤土中研究了噻唑啉在厌氧条件下的结局。基于干重：体积（w / v）之比，沉积物/水之比为1：3；（DAT）处理后，孵育持续了355天，并在20.4±0.7°C的黑暗环境中进行。上层的水流通系统由玻璃容器组成，该玻璃容器装有沉积物，并带有捕集[14C]二氧化碳和[14C]挥发物的阱。收集样品并在0、3、7、14、50、100、200和355 DAT进行分析。将水和沉积物样品用溶剂系统萃取，离心，浓缩，然后通过液体闪烁计数和配备有流动闪烁分析仪的高效液相色谱（HPLC）系统进行分析。提取后，将沉淀物风干，并将子样品燃烧。[14C]甲硫唑啉在水相中降解并迅速分配到沉积物中，在其中进一步降解为其他代谢物，这些代谢物通过HPLC和液相色谱或气相色谱串联质谱法（MS / MS）进行鉴定，并采用真实的标准。甲硫唑啉从上层水中的消散迅速（粘土壤土和沙质壤土的半衰期分别为1.1-1.8天和3.6-4.9天）。但是，从沉积相和整个系统消散的甲硫唑啉比从水相消散的慢得多（半衰期为122.0-220.0和110.0-130。
更新日期：2019-11-28
中文翻译：
在水生沉积条件下厌氧降解[14C]甲硫唑啉。
使用[dihydroisoxazole ring-14C]和[phenyl-14C]放射性标记，在有机碳含量高的粘土壤土和碳含量低的沙质壤土中研究了噻唑啉在厌氧条件下的结局。基于干重：体积（w / v）之比，沉积物/水之比为1：3；（DAT）处理后，孵育持续了355天，并在20.4±0.7°C的黑暗环境中进行。上层的水流通系统由玻璃容器组成，该玻璃容器装有沉积物，并带有捕集[14C]二氧化碳和[14C]挥发物的阱。收集样品并在0、3、7、14、50、100、200和355 DAT进行分析。将水和沉积物样品用溶剂系统萃取，离心，浓缩，然后通过液体闪烁计数和配备有流动闪烁分析仪的高效液相色谱（HPLC）系统进行分析。提取后，将沉淀物风干，并将子样品燃烧。[14C]甲硫唑啉在水相中降解并迅速分配到沉积物中，在其中进一步降解为其他代谢物，这些代谢物通过HPLC和液相色谱或气相色谱串联质谱法（MS / MS）进行鉴定，并采用真实的标准。甲硫唑啉从上层水中的消散迅速（粘土壤土和沙质壤土的半衰期分别为1.1-1.8天和3.6-4.9天）。但是，从沉积相和整个系统消散的甲硫唑啉比从水相消散的慢得多（半衰期为122.0-220.0和110.0-130。
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