Diterpenos de Copaifera reticulata Ducke com atividade larvicida contra Aedes aegypti (L.) (Diptera, Culicidae)

Revista do Instituto de Medicina Tropical de São Paulo

Regina Geris²  Ionizete Garcia Da Silva¹  Heloísa Helena Garcia Da Silva¹  Andersson Barison¹  Edson Rodrigues-filho¹  Antônio Gilberto Ferreira¹ 

[1] ,Universidade Federal da Bahia Instituto de Química Salvador BA ,Brasil

关键词: Copaifera reticulata;    ent-Labdane Diterpenoids;    Larvicidal activity;    Aedes aegypti;   

DOI  :  10.1590/S0036-46652008000100006

来源: SciELO

【 摘 要 】

The objective of this study was to evaluate the larvicidal activity of diterpenoids obtained from the oil-resin of Copaifera reticulata against Aedes aegypti larvae, the principal vector of dengue and urban yellow fever. Four diterpenes were obtained from oil-resin extraction with organic solvents and subsequent chromatographic and spectroscopic procedures allowed to isolation and identification of these compounds as 3-b-acetoxylabdan-8(17)-13-dien-15-oic acid (1), alepterolic acid (2), 3-b-hidroxylabdan-8(17)-en-15-oic acid (3), and ent-agatic acid (4). Each compound was previously dissolved in dimethylsulphoxide, and distilled water was added to obtain the desired concentrations. Twenty larvae of third instars were placed into plastic beckers, containing the solution test (25 mL), in a five repetitions scheme, and their mortality, indicated by torpor and darkening of the cephalic capsule, was recorded after 48h. Probit analyses were used to determine lethal concentrations (LC50 and LC90) and their respective 95% confidence intervals. This study showed that only diterpenoids 1 and 2 exhibited larvicidal properties with LC50 of 0.8 ppm and 87.3 ppm, respectively, revealing the former as the most toxic compound against third instars of Ae. aegypti. Therefore, this compound seems to be an interesting source for new metabolite to be exploited.

【 授权许可】

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