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Extratos vegetais com propriedades nematicidas e purificação do princípio ativo do extrato de Leucaena leucocephala Nematocidal plant extracts and purification of active ingredients of Leucaena leucocephala extract

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Author(s): Flávia R. Cunha | Denilson F. Oliveira | Vicente P. Campos

Journal: Fitopatologia Brasileira
ISSN 0100-4158

Volume: 28;
Issue: 4;
Start page: 438;
Date: 2003;
Original page

Keywords: nematóide | Panagrellus redivivus | planta

ABSTRACT
Inicialmente buscou-se identificar plantas com extratos metanólicos ativos in vitro contra o nematóide Panagrellus redivivus. Das 24 espécies vegetais estudadas, constatou-se que os melhores resultados foram obtidos com Leucaena leucocephala, que causou mortalidade de 93% dos indivíduos expostos ao seu extrato por 24 h. Em seguida, submeteu-se o referido extrato a fracionamento direcionado pelos testes in vitro com P. redivivus, o que possibilitou isolar uma substância nematicida que, segundo análises preliminares, correspondia a um alcalóide.Initially this work was aimed to identify plant methanolic extracts toxic in vitro to the nematode Panagrellus redivivus. Among 24 plant species studied, Leucaena leucocephala afforded the best results, as 93% of the nematodes were dead after exposure to its extract during 24 h. Thus, such extract was submitted to a purification process guided by in vitro assays with P. redivivus. As a result, one substance active against such nematode was isolated. According to preliminary analysis, that seems to be an alkaloid.
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