Abstract
The fungicide tecloftalam and its metabolite tecloftalam-imide were individually determined. They were extracted from brown rice with acetone and re-extracted with ethyl acetate. The extract was partitioned between n-hexane and acetonitrile to remove oil, and then charged on a Sep-Pak Plus Florisil cartridge. Tecloftalam-imide was eluted with 50% diethyl ether-n-hexane and then tecloftalam was eluted with methanol. Tecloftalam-imide was determined on a gas chromatograph (GC) equipped with a capillary column DB-1 and an electron capture detector (ECD). Tecloftalam was converted into tecloftalam-imide by addition of acetic anhydride, and determined by GC-ECD. Recoveries of tecloftalam and tecloftalam-imide from rice spiked at levels of 0.2ppm were 89.3±1.9% and 82.6±1.5%, respectively. Detection limits were 0.01ppm in samples.
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