Molluscicidal activity of crown of Christ (Euphorbia splendens var. hislopii) (Euphorbiaceae) latex submitted to pH variation

Brazilian Archives of Biology and Technology

Maurício Carvalho Vasconcellos²  José Augusto Albuquerque Dos Santos²  Ivonise Paz Da Silva²  Fátima Eliana Ferreira Lopes²  Virgínia Torres Schall¹ 

[1] ,Fundação Oswaldo Cruz Instituto Oswaldo Cruz Núcleo de Biologia e Controle de Endo e Ectoparasitas de Interesse Médico e VeterinárioRio de Janeiro RJ ,Brazil

关键词: Euphorbia splendens var. hislopii;    molluscicidal activity;    pH variation;    Biomphalaria sp.;    Bulinus sp.;   

DOI  :  10.1590/S1516-89132003000300013

来源: SciELO

【 摘 要 】

Laboratory and field bioassays have confirmed the specificity of the molluscicidal activity of the Euphorbia splendens var. hislopii latex (crown of Christ) (Euphorbiaceae) over snails of the species Biomphalaria glabrata, B. tenagophila, B. straminea, B. pfeifferi and Bulinus sp. in the control of Schistosoma mansoni. In the present study, the effect of the pH variation on lethal concentration (LC90) over B. tenagophila was evaluated. Bioassays with the aqueous solutions of the latex ranging from 0.4 to 12 µl/l were adjusted for pH of 5.0; 6.0; 7.0 and 8.0, and tested in accordance with methods standardized by World Health Organization. The results obtained indicated that the minor concentration of the latex occurred at pH 6.0 (LC90 = 3.2 µl/l) and the maximum at pH 8.0 (LC90 = 10.3 µl/l). Lethal concentrations adjusted for pH 5.0 and 7.0 were 3.4 µl/l and 4,7µl/l, respectively. From the results it could be concluded that the molluscicidal toxicity was not altered when the concentrations were adjusted for pH 5.0 and 6.0, as we observed that mortality rate was 100% starting at a concentration of 2.0 µl/l, not the same for the concentrations with adjustment for pH 7.0 and 8.0.

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