Determination of the antinutritional factors in the seed of tropical grain legumes with potential for human and animal feeding

摘要

This study aimed at evaluating the content of anti-nutritional factors (ANFs) such as protease inhibitors, condensed tannins and inositol phosphate in meals from the seed of eight cultivars from the tropical grain legume species Vigna unguiculata (cowpea), Glycine max (soybean), Canavalia ensiformis (jackbean), Lablab purpureus (dolichos) and Stizolobium niveum (mucuna). The soybeans contained the highest trypsin (15.86 g/100 g for Incasby 27 and 13.29 g/100 g in Duocrop) and chymotrypsin inhibitor levels (6.40 g/100 g in Duocrop), followed by dolichos. Mucuna had the highest amount of inositol phosphate (16.36 mu mol/g) and condensed tannins (0.38 %), together with the cowpea variety IMFAT 93 (0.43 %, for tannins). This study showed the variabilityin ANF concentrations among legume species and varieties. This indicates the need to determine the ANF content of all legume species or cultivars used for human and animal feeding. Generally, cowpea was the legume with the lowest ANF content specially the cv. Tropico 782. The presence of more than one ANF in all of the seeds evaluated, and the different chemical composition of their seeds indicates the need for processing to increasing their nutritive value.