| Revista: | Quimica nova |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000199199 |
| ISSN: | 0100-4042 |
| Autors: | Nunes, Gilvanda Silva1 Santos, Teresa Cristina R Barceló, Damiá Pimenta, Alexandre Santos Ribeiro, Maria Lucia |
| Institucions: | 1Universidade Estadual Paulista "Julio de Mesquita Filho", Instituto de Quimica, Araraquara, Sao Paulo. Brasil 2Universidade Federal do Maranhao, Departamento de Tecnologia Quimica, Sao Luis, Maranhao. Brasil 3Universidade Federal de Vicosa, Departamento de Engenharia Florestal, Vicosa, Minas Gerais. Brasil 4Consejo Superior de Investigaciones Científicas, Centro de Investigación y Desarrollo, Barcelona. España |
| Any: | 2002 |
| Període: | Mar-Abr |
| Volum: | 25 |
| Número: | 2 |
| Paginació: | 214-220 |
| País: | Brasil |
| Idioma: | Portugués |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental |
| Resumen en inglés | Six supercritical fluid extraction (SFE) methods were tested, by varying the following operational parameters: CO2 pressure, time and temperature of extraction, type and proportion of static modifier, and Hydromatrix®/sample rate into cell. Firstly, insecticide carbamates were extracted from spiked potatoes samples (fortification level of 0,5 mg.Kg-1) by using SPE procedures, and then final extracts were analyzed HPLC/fluorescence. Good performance was observed with SFE methods that operated with values of temperature and CO2 pressure of 50 oC and 350 bar, respectively. Best efficiency was obtained when it was used acetonitrile as a modifier (3% on the cell volume), and Hydromatrix®/sample rate of 2:1. Static time was of 1 min; total extraction time was of 35 min; dynamic extraction was performed with 15 mL of CO2, and it was used methanol (2 mL) for the dissolution of the final residue. In such conditions, pesticide recoveries varied from 72 to 94%, depending on the analyzed compound. In higher extraction temperatures, a rapid degradation was observed for some compounds, such as aldicarb and carbaryl; presence of their metabolites was further confirmed by HPLC-APCI/MS in positive mode. Detection limits for chromatographic analysis varied from 0,2 to 1,3 ng |
| Disciplines | Química, Medicina |
| Paraules clau: | Química analítica, Toxicología, Fluidos, Fluidos supercríticos, Insecticidas, Carbamatos, Papa, Plaguicidas |
| Keyword: | Chemistry, Medicine, Analytical chemistry, Toxicology, Fluids, Supercritical fluids, Insecticides, Carbamates, Potato, Pesticides |
| Text complet: | Texto completo (Ver HTML) |
