Repellency of Cinnamomum cassia bark compounds and cream containing cassia oil to Aedes aegypti (Diptera: Culicidae) under laboratory and indoor conditions
Autor(es): Chang, Kyu-Sik; Tak, Jun-Hyung; Kim, Soon-Il; Lee, Won-Ja; Ahn, Young-Joon
Resumo: Patch and skin bioassays were used in laboratory and indoor tests to evaluate the repellency of (E)-cinnamaldehyde, identified in Cinnamomum cassia Blume bark and essential oil, and a cream containing 5% (w/w) cassia oil against Aedes aegypti (L.) females. Results were compared with those of a known C. cassia compound cinnamyl alcohol, N,N-diethyl-m-toluamide (DEET) and two commercial repellents: MeiMei® cream containing citronella and geranium oils and Repellan S® aerosol containing 19% DEET. In patch bioassay tests with A. aegypti females, (E)-cinnamaldehyde at 0.153 mg cm-2 and DEET at 0.051 mg cm-2 provided 93 and 89% protection at 40 min after exposure. In skin bioassay tests, (E)-cinnamaldehyde at 0.051 mg cm-2 and DEET at 0.025 mg cm-2 provided 87 and 95% protection at 30 min after application. (E)-Cinnamaldehyde was significantly more effective than cinnamyl alcohol in both bioassays. In indoor tests with four human volunteers, 5% cassia oil cream provided 94, 83 and 61% protection against A. aegypti females exposed for 30, 50 and 70 min after application respectively. Cassia oil cream was a slightly less effective repellent than MeiMei cream. Repellan S aerosol provided 91% repellency at 120 min after application. Products containing cassia oil merit further study as potential repellents for the protection of humans and domestic animals from blood-feeding vectors and the diseases they transmit.
Palavras-Chave: Natural mosquito repellent; Aedes aegypti; Cinnamomum cassia; Cassia oil; Cinnamaldehyde
Imprenta: Pest Management Science, v. 62, n. 11, p. 1032-1038, 2006.
Descritores: Aedes aegypti - Transmission ; Aedes aegypti - Repellent ; Aedes aegypti - Public health
Data de publicação: 2006
