In vitro protein digestibility and mineral availability of green beans (Phaseolus vulgaris L) as influenced by variety and pod size
1998
Martínez, C. | Ros, G. | Periago, M.J. | Ortuno, J. | Lopez, G. | Rincon, F.
Three varieties of green beans (Cleo, Strike and Sentry) were harvested and sorted into four fractions according to pod site (diameter <7 mm; 7-8.5 mm; 8.6-10 mm and > 10 mm). Ash content and dietary fibre increased significantly as pod size increased mainly in Cleo and Strike beans. Strike showed the highest fibre content (378.0 g kg-1) but the lowest carbohydrate (364.6 g kg-1) and ash (68.4 g kg-1) values. Mean values for Fe and Mg content were higher in Cleo beans (70.9 and 27.1 mg kg-1, respectively), Zn, Cu and Mg were higher in Strike beans (48.7 mg kg-1, 22.4 mg kg-1 and 3.15 g kg-1, respectively) while Na and Ca values were maximum in Sentry (459.1 mg kg-1 and 7.11 g kg-1, respectively). Trypsin inhibitor was negatively related to in vitro protein digestibility but no relationship was found between this last parameter and phytic acid content. This antinutrient, together with dietary fibre, and a negative influence on in vitro mineral dialysability of green beans.
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