Abstract：
:Kresoxim-methyl and its two thermolabile metabolites, BF 490-2 and BF 490-9, were analyzed in pear using a pepper leaf matrix protection to maintain the metabolites inside the gas chromatography system. Samples were extracted with a mixture of ethyl acetate and n-hexane (1:1, v/v) and purified and/or separated using a solid phase extraction procedure. The pepper leaf matrix was added and optimized with cleaned pear extract to enhance metabolite sensitivity. Matrix matched calibration was used for kresoxim-methyl in the pear matrix and for metabolites in the pear mixed with pepper leaf matrix. Good linearity was obtained for all analytes with a coefficient of determination, r (2) ⩾ 0.992. Limits of detection (LOD) and quantification (LOQ) were 0.006 and 0.02 mg kg(-1) and 0.02 and 0.065 mg kg(-1) for kresoxim-methyl and the metabolites, respectively. Recoveries were carried out at two concentration levels and were 85.6-97.9% with a relative standard deviation <2.5%. The method was successfully applied to field incurred pear samples, and only kresoxim-methyl was detected at a concentration of 0.03 mg kg(-1).
journal_name
J Adv Resjournal_title
Journal of advanced researchauthors
Rahman MM,Jang J,Park JH,Abd El-Aty AM,Ko AY,Choi JH,Yang A,Park KH,Shim JHdoi
10.1016/j.jare.2013.05.003subject
Has Abstractpub_date
2014-05-01 00:00:00pages
329-35issue
3eissn
2090-1232issn
2090-1224pii
S2090-1232(13)00066-0journal_volume
5pub_type
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