Atividade biológica de extratos acetato de etila, etanólico e aquoso de timbó (Lonchocarpus floribundus) sobre carrapato bovino

Abstract

RESUMOOs extratos acetato de etila, etanólico e aquoso de raízes de Lonchocarpus floribundus foram utilizados, a fim de avaliar a atividade biológica sobre carrapato bovino. Carrapatos adultos foram coletados em bovinos infestados artificialmente, separados em grupos de dez indivíduos, pesados e imersos, separadamente, nos extratos de raízes de L. floribundus, nas concentrações de 5, 25, 50, 75 e 100 mg mL Biological activity of ethylic acetate, ethanolic and aqueous extracts of timbo (Lonchocarpus floribundus) on cattle tickABSTRACT Ethylic acetate, ethanolic and aqueous roots extracts of Lonchocarpus floribundus were used to evaluate their biological activity on cattle tick Rhipicephalus (Boophilus) microplus. Adult ticks were collected in artificially infested cattle, separated into groups of ten individuals, weighed and immersed separately in the extracts of L. floribundus roots at concentrations of 5, 25, 50, 75 and 100 mg mL -1 . For biological evaluation 14-21-day-old larvae were used, which were immersed in the extracts at concentrations of 1, 5, 10, 15 and 20 mg mL -1 . After treatment, each group was placed in a Petri dish and maintained at 27 ± 1 ºC and 80 ± 5% relative humidity. The extracts evaluated were not effective to induce mortality of over 50%-engorged female. The ethylic acetate and ethanolic extracts induced 100% mortality of larvae. The ethanolic extract was more toxic (median lethal concentration, LC 50 , of 2.1 mg mL -1 ) than the ethylic acetate extract (LC 50 = 4.1 mg mL -1). For the ethanolic extract it was estimated a median inhibitory concentration (IC 50 ) of 3.0 mg mL -1 and it was more toxic than the other extracts on this parameter. Among the three extracts evaluated, the ethylic acetate and ethanolic extracts showed the highest potential for the control of reproduction of R. (B.) microplus, reaching 100% at concentration of 5 mg mL -1 . The L. floribundus root extracts showed biological activity on cattle tick.

10. Public-private partnership enabled use of anti-tick vaccine for integrated cattle fever tick eradication in the USA

“…The extract killed larvae and engorged females in vitro, but it was not efficient in vivo. Good results in in vitro tests on larvae and females of R. microplus were reported for extracts of Lonchocarpus floribundus roots (Machado et al 2013).…”

The Roots of Deguelia nitidula as a Natural Antibacterial Source against Staphylococcus aureus Strains

“…After this, the infusion is applied, with the help of absorbent cotton, directly to the affected skin. Furthermore, anti-inflammatory, insecticidal, and antimicrobial activities [12] have been attributed to the genus, and activities against the tick Rhipicephalus (Boophilus) microplus (Canestrini, 1887) [13] and acaricides [14] were reported for that species.…”

Efeito inseticida e modos de ação do extrato aquoso de Deguelia amazonica sobre Bemisia tabaci Biótipo B em Brassica olereceae var. acephala

“…Espécies vegetais conhecidas como o timbó (Fabacea) aparecem como objeto desses estudos, pois a toxicidade de suas raízes está associada principalmente aos seus princípios ativos como a rotenona e a deguelina (Alecio et al, 2014), sendo seus efeitos atestados por diversos autores em relação ao combate de diversas pragas de importância econômica (Jesus et al, 2013;Machado et al, 2013).…”