Structural characteristics were identified that may contribute to the understanding of the larvicidal activity of phenylpropanoids. The present approach may help future work in the search for larvicidal compounds.

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The essential oils from the leaves of Annona salzmannii and A. pickelii (Annonaceae) growing in Sergipe, northeastern region of Brazil, were obtained by hydrodistillation using a Clevenger-type apparatus, and analyzed by GC/MS and GC/FID. Thirty-four compounds were identified in the essential oil of A. salzmannii and twenty-seven in that of A. pickelii; sesquiterpenes predominated in both essential oils. Bicyclogermacrene (20.3%), (E)-caryophyllene (19.9%), -cadinene (15.3%), -copaene (10.0%), and allo-aromadendrene (5.7%) were the main components of A. salzmannii, and bicyclogermacrene (45.4%), (E)-caryophyllene (14.6%), and -copaene (10.6%) of A. pickelii. The essential oils showed significant antioxidant capacity in the ORAC FL and DPPH assays. The antimicrobial activity of these essential oils was also evaluated against bacteria and fungi, as well as the larvicidal activity against Aedes aegypti larvae.

Apresenta-se a atualização da distribuição de Aedes albopictus no Brasil, de 1997 até o ano de 2002, segundo dados do Sistema de informação de Febre Amarela e Dengue da Fundação Nacional de Saúde. Verifica-se a ocorrência da espécie em 20 dos 27 Estados brasileiros.