INTEQUI   20941
INSTITUTO DE INVESTIGACIONES EN TECNOLOGIA QUIMICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Variación geografica y estacional en la composición química de Baccharis salicifolia Ruiz & Pavon y actividad insecticida frente a Triatoma infestans Klug
Autor/es:
GUERREIRO A, CECATI F, ARDANAZ C, TONN CE, SOSA ME
Lugar:
San Luis
Reunión:
Otro; XXX Reunión Anual de la Sociedad de Biología de Cuyo; 2012
Institución organizadora:
Sociedad de Biología de Cuyo,
Resumen:
Seasonal and geographical variation in the chemical composition of Baccharis salicifolia Ruiz & Pavon, and insecticidal activity against Triatoma infestans Klug Control populations of T. infestans were achieved through synthetic insecticides. Although these have shown high efficacy has been detected high levels of resistance. The possibility of using essential oils or their components deserves further attention. It has been shown that seasonal differences affects the chemical composition of the oils and therefore modifies its bioactivity. The aim of this work is to study the seasonal and geographical variation of the components of B. salicifolia and compare their insecticidal activity in fourth instar nymphs of T. infestans. The plant material was collected in Cruz de Piedra and Barrancas, San Luis, during the months of March and December. Essential oils were analyzed by gas chromatography-mass spectrometry (GC-MS) and identify the components using the library provided with the instrument (Finnigan MAT GCQ) and reference spectra. Test solutions were topically applied to the ventral surface of the thoracic segments with a micro syringe (2 l/ nymph). Controls were treated with the solvent alone. Mortality was assessed every 24 hours until the 5th day. The chemical analysis showed that the composition of the oils was different in March and December in Cruz de Piedra as well as in Barrancas. B salicifolia essential oil (Barrancas-December) showed toxic activity. The highest concentration of germacrene in this essential oil in these samples could be the cause of the higher mortality (66.66%). Based on these results, we consider it important to perform additional studies on the toxicological properties of this essential oil on this Chagas disease vector.