Propriedades herbicidas de metabólitos secundários presentes nos extratos de caule e raiz de Caryocar brasiliense (Pequi)

Abstract

The methanolic stem and root’s extracts were tested in order to certificate their herbicide potential in germination test, which analyzed germination rate, stem and root’s length of Panicum maximum weeds. It was observed that the both extracts, of stem and root. The both extract presented herbicide potentials and the root’s extract were better than stenTs extract. The hexanic ffaction and the subfractions 8, 11 e 13 (extracted ífom acetate/methanol 7:3) also presented inhibition. The recognition of secondary metabolites’ tests showed the presence of alkaloids, volatile coumarins, flavonoids and condensed tannins in the hexanic ifaction and 8, 11 e 13 subfractions, respectively. In all of them, it was found saponins too. The analysis in a gas chromatography with a mass spectrometer presented as results simples structures of acids, esters and alkanes. The compounds metyl-9-oxoexadecanoate, metyl-(E)-10-octadecenoate and metyl-14- methylpentadecanoate, which were presented in most quantities, in value, 40,40%; 24,89% and 13,52 %, respectively. The herbicide activity of root and stem extracts, their fractions and subfractions were associated of synergy phenomenon among the compounds were there.