Antinutritional factors and in vitro protein digestibility of improved haricot bean (Phaseolus vulgaris L.) varieties grown in Ethiopia.

摘要

Poor digestibility and biological utilisation of beans has been directly associated with their content of antinutritional factors. The antinutritional factors, in vitro protein digestibility and oligosaccharide content of eight haricot bean varieties grown in Ethiopia were evaluated. Stachyose was found to be the predominant alpha-galactoside in all haricot bean samples, while significant amounts of raffinose were also present. Protein digestibility and antinutritional factors were seen to vary greatly between bean varieties examined. Mean values for protein digestibility and for antinutritional factors raffinose, stachyose, sucrose, trypsin inhibitors, tannins and phytic acid were determined. Statistical analyses indicated that antinutritional factors and protein digestibility were influenced by genotype. Relationships between antinutritional factors and protein digestibility were also observed. Possible selection of varieties for use in large-scale cultivation in Ethiopia is discussed. Roba, Redwolaita, Mexican and Awash were identified as the best haricot bean varieties for food and export in Ethiopia.