Resumo

SCULL-RODRIGUEZ, Idania; SAVON-VALDES, Lourdes Lucila  e  HORMAZA-MONTENEGRO, Josefa Victoria. Evaluation of secondary metabolites in the meal of Stizolobium aterrimum forage, for its use in animal feeding. Pastos y Forrajes [online]. 2017, vol.40, n.4, pp. 302-307. ISSN 2078-8452.

The objective of the study was to evaluate the secondary metabolites present in the meal of Stizolobium aterrimum forage, for its use in animal feeding; the meal was elaborated from the leaves and fresh stems of plants which were cultivated on a Ferralitic Red soil, and the secondary metabolites were evaluated through phytochemical sieving. To determine the profile of phenolic compounds the content of total polyphenols (TP), free condensed tannins (FCT), protein-bound condensed tannins (PCT) and fiber-bound condensed tannins (FBCT), was quantified. The content of oligosaccharides was determined by high-performance liquid chromatography (HPLC), and they were expressed as raffinosaccharide equivalents. Tannins, alkaloids and reducing substances were found in higher quantity; while flavonoids, saponins, aminoacids, anthocyanidins and triterpenes/steroids were found in moderate and low quantities. The concentration of TP was 2,32 %. There were differences (p < 0,001) among the fractions of FCT (0,25 %), PCT (0,22 %) and FBCT (0,08 %). In the carbohydrate fraction only fructose was found (0,006 mg/kg DM) in low concentration. The qualitative presence of different secondary metabolites in the meal of S. aterrimum forage, in appropriate concentrations, allows to consider it a plant with potential to be used in animal feeding

Palavras-chave : flavonoids; polyphenols; saponins; tannins.

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