%0 Journal Article %J J AOAC Int %D 2005 %T Analytical method for dimethenamid-P in selected raw agricultural commodities by gas chromatography with electron capture detection. %A Kim A Anderson %A Basile, Jennifer L %A Johnson, Eugene R %K Acetanilides %K Chromatography, Gas %K Herbicides %K Sensitivity and Specificity %K Vegetables %X

A sensitive and simple method for the extraction and quantification of the herbicide dimethenamid-P from several raw agricultural commodities (RAC) is presented. The method provides sensitive and well-defined chromatography with baseline resolution in all matrixes tested. Homogenized samples were extracted with methanol-water, filtered, and then extracted with hexanes. A Florisil solid-phase extraction was then applied for the final cleanup. Sample separation and quantification were performed by gas chromatography with an electron capture detector. The instrument detection limit was 0.007 microg/mL, and the practical quantification limit was 0.003 microg/g (w/w) based on a 25 g sample. Recoveries for a series of fortified plant tissues ranged from 69 to 103%. The study demonstrated selective and sensitive recovery of dimethenamid-P from the RAC tested.

%B J AOAC Int %V 88 %P 1428-32 %8 09/2005 %G eng %N 5 %1 http://www.ncbi.nlm.nih.gov/pubmed/16385993?dopt=Abstract %0 Journal Article %J J Agric Food Chem %D 2002 %T Chemical marker for ALS-inhibitor herbicides: 2-aminobutyric acid proportional in sub-lethal applications. %A Loper, Bobby R %A Cobb, William T %A Kim A Anderson %K Acetolactate Synthase %K Aminobutyric Acids %K Autoanalysis %K Chromatography, Liquid %K Enzyme Inhibitors %K Herbicides %K Kinetics %K o-Phthalaldehyde %K Solanum tuberosum %K Trichloroacetic Acid %X

A chemical profiling technique for sub-lethal acetolactate synthase (ALS)-inhibitor herbicides (e.g., sulfonylureas, imidazolines, triazolopyrimidine sulfonanilides, and pyrimidyloxy salicylic) was developed using 2-aminobutyric acid, and was found to be directly proportional to application rates in field studies on two varieties of potato plants. An uncomplicated, benign-by-design analytical method for the determination of 2-aminobutyric acid in plant tissue was developed. The method is simple, fast, and automated, entailing a water-trichloroacetic acid extraction followed by precolumn on-line derivatization using o-phthalaldehyde (OPA) solution and liquid chromatographic analyses. Use of reagents and chlorinated organic solvents, and generation of waste, are minimized as compared to other ALS-inhibitor herbicide analytical techniques. Recoveries for a series of fortified plant tissues ranged from 82 to 103%. Two 20-day field trials on two potato varieties, Russet Burbank and Shepody, were conducted during the 2000 and 2001 growing seasons. The study demonstrated that the 2-aminobutyric acid method is an excellent, selective chemical marker technique for ALS-inhibitor herbicides for real world plant matrixes.

%B J Agric Food Chem %V 50 %P 2601-6 %8 2002 Apr 24 %G eng %N 9 %1 http://www.ncbi.nlm.nih.gov/pubmed/11958629?dopt=Abstract