Microwave-Assisted Extraction Coupled with Liquid Chromatography/Electrospray Ionization Mass Spectrometry for the Simplified Determination of Imidazolinone Herbicides and Their Metabolites in Plant T

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• 作者：Steven J. Stout ; Adrian R. daCunha ; Gerald L. Picard ; and Maximilian M. Safarpour
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：1996
• 出版时间：November 1996
• 年：1996
• 卷：44
• 期：11
• 页码：3548 - 3553
• 全文大小：242K
• 年卷期：v.44,no.11(November 1996)
• ISSN：1520-5118

文摘

The imidazolinones are a significant new class of low-use-rate,reduced-environmental-risk herbicidesfor protection of a wide variety of agricultural crops. Currentresidue methodologies for determiningthe imidazolinones and their metabolites in crops involve laborious,time-consuming cleanupprocedures after an aqueous/organic extraction. Using imazethapyr,the most widely utilized memberof the class, and its metabolites as representatives, liquidchromatography/electrospray ionizationmass spectrometry was found to permit processing as little as 1% ofthe extract normally processedthrough the existing methods. Microwave-assisted extraction aidedin the shortened cleanupprocedure by providing a 100% aqueous initial extract. Over arange of 11 different commodities,average recoveries for imazethapyr, its hydroxy metabolite, and theglucose conjugate were 100%,102%, and 97%, respectively. The simplicity and generalapplicability of this analytical approachreduced not only sample analysis time but also, perhaps even moreimportantly, method developmenttime.Keywords: Imidazolinone; herbicides; determination; MAE;LC/ESMS