Pesticidas organoclorados em plantas medicinais e fitoterapicos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

The pesticide contamination of plants as medicinal or food uses is very common, and could be due to the own cultivation in large scale, migration of neighboring cultures or the environmental contamination. Although banished of many countries, besides Brazil, due to its high toxicity and environmental persistence, the organochlorine pesticides (OCP) continue thoroughly distributed in the planet. Depending on the processing of these plants, the pesticides when present, can have its levels increased or reduced. In this work the methodology proposed for quantification of OCP (hexachlorobenzene lindane, heptachlor, heptachlor epoxide, aldrin, dieldrin, endrin, 4,4 -DDE and 4,4 -DDT) in leaves of Mikania sp, Maytenus iIicifolia and Cordia curassavica was gas chromatography with mass detector (GC-MS) using HP-5MS capillary column operating to 90 °C/1 min (12°C min) 150 °C/1 min (2 °C min) 230 °C/3 min (10 °C min) 275 °C/25 min. Two extraction techniques for OCP quantification in leaves were evaluated, the microwave assisted extraction combined with solid-phase microextraction (MAE-SPME) and the solvent extraction with solid phase extraction (SPE). The analytical methodology was also established for OCP quantification in the infusion of these plants through the employment of the SPME-GC-MS technique by direct immersion of the PDMS fiber in the sample solution (90 min to 50 °C). This condition was optimized by response surface methodology. The methods for OCP quantification in leaves and in the infusion were validated and applied in samples of different origins including the plants cultivated in an area with high levels of contamination.

ASSUNTO(S)

pesticidas plantas medicinais

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