Evaluation of bush and vine black beans for physical, chemical and nutritional characteristics
Bressani, R.; Benavides, V.; Calderón, E.; Ortíz, M.A.; Chon, C.
Archivos Latinoamericanos de Nutricion 45(2): 140-144
1995
ISSN/ISBN: 0004-0622 PMID: 8729266 Document Number: 445879
It was investigated whether there are physical, chemical and nutritional differences between vine and bush type of beans. 4 samples of black colour beans (Phaseolus vulgaris) of the vine type, and 4 of the bush type were collected from farmers in the same growing area. The samples were analysed for some physical properties including, 100 seed weight, size distribution, percent seed coat, water absorption, cooking time and of solids on cooking waters. Vine type beans had larger 100-seed weights, larger sized beans, thicker seed coats and lower solids in the cooking water than bush type beans. Rate of water absorption was different. The chemical characterization included proximate analysis and fibre fractionation. Vine type beans had, on average, less ether extract and protein than bush types. No differences were found in fibre fractions, although there was a higher variability in the vine types. Protein quality and protein digestibility when fed as the single protein source, were similar on average, with more variability in the vine types. Both types, efficiently supplemented maize proteins and the protein digestibility was higher than when fed alone. In general there were no large differences, except in some physical estimations between vine and bush type beans, with the former showing greater nutritional variability which could be useful in selection programmes, if such variability is confirmed.