Static-dynamic pressurized hot water extraction coupled to on-line filtration-solid-phase extraction-high-performance liquid chromatography-post-column derivatization-fluorescence detection for the analysis of N-methylcarbamates in foods

Herrera, M.C.; Prados Rosales, R.C.; Luque Garcia, J.L.; Luque, D.C.stro, M.D.

Analytica Chimica Acta 463(2): 189-197


ISSN/ISBN: 0003-2670
DOI: 10.1016/s0003-2670(02)00427-0
Accession: 011395429

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A combination of static-dynamic modes of pressurized hot water extraction has been used for the extraction of N-methyl-carbamates (namely, oxamyl, dioxacarb, metholcarb, carbofuran and carbaryl) from different fruits and vegetables. The selection of water as leaching agent provides a clean approach which avoids the use of organic solvents. A flow injection manifold coupled to the extractor has allowed the automation of the subsequent steps (namely, filtration, preconcentration, individual chromatographic separation, post-column derivatization and fluorescence detection) involved in the analytical process. Good recoveries, ranging from 80 to 104%, and precision, expressed as relative standard deviation, between 3.0 and 8.4% have been achieved by the proposed method.