Application of liquid chromatography/electrospray ionization tandem mass spectrometry for the elucidation of hydroxyl radical oxidation of metsulfuron methyl and related sulfonylurea pesticide products: evidence for the triazine skeleton scission
作者:Rajae Chahboune、Hafida Mountacer、Mohamed Sarakha
DOI:10.1002/rcm.7234
日期:2015.8.15
by excitation of the iron(III) aquacomplex [Fe(H(2)O)OH](2+) and hydrogen peroxide at pH 3.5. Three different sulfonylureas were studied: metsulfuron methyl, cinosulfuron and thifensulfuron methyl. RESULTS Several products owing to the reactivity of hydroxyl radicals with sulfonylurea were obtained. They arise from scission of the sulfonylurea bridge, hydroxylation of the aromatic ring, demethylation
理由磺脲类药物是最重要的一类抗糖尿病药和除草剂。由于结构相对复杂,太阳光激发和高级氧化过程可能导致形成各种各样的产物。这些应该被鉴定的产品可能比母体化合物具有更大的毒性作用。方法液相色谱/电喷雾电离四极杆飞行时间质谱(LC / ESI-QTOFMS)具有精确的质量测定方法,是一种精确阐明所有可能副产物的有价值的技术。通过在pH 3.5下激发铁(III)水络合物[Fe(H(2)O)OH](2+)和过氧化氢产生羟基自由基。研究了三种不同的磺酰脲类:甲磺隆,辛磺隆和噻吩磺隆。结果由于羟基与磺酰脲的反应性,得到了几种产物。它们起因于磺酰脲桥的断裂,芳环的羟基化,甲氧基的去甲基化,以及更重要的和明确的三嗪骨架的断裂。为了达成这种分裂,三嗪部分上的甲氧基的伯基去甲基化似乎充当了前体过程。用三种研究过的磺酰脲类化合物观察到了这一过程。结论所报告的结果证明了LC / ESI-QTOFMS进行精确质量测量对