NUTRIENT COMPOSITION, ANTINUTRIENTS AND PROTEIN QUALITY OF WINGED BEAN [Psophocarpus tetragonolobus(l] DC] SEEDS
Loading...
Date
1998-08-19
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
Winged bean [Psophocarpus tetragonolobus (L) DC] is an underexploited
multipurpose crop. Winged bean seeds of 59 genotypes grown at ARS, Siruguppa, UAS, Dharwad
were studied for their physico-chemical characteristics and nutrient composition. Thirteen
genotypes were processed by soaking, decortication and pressure cooking and changes in nutrients
and antinutrients assessed. Protein quality ofpresoaked pressure cooked broth retained (PPCB)
seeds was assayed by protein cflicicncy ratio (PliR), digestibility coeiricicnt (DC), biological
value (BV), net protein utilization (NPU) and net dietary protein calories (NOP Cal%). Significant
varietal dilTcrences in physico-chemical characteristics and nutrient composition existed. Seedcoat
colour varied from cream, brown, grey, mixed colours to black. Seed weight and volume positively
influenced the physico-chemical characteristics. Hardseeds influenced them inversely. Mean crude
protein content was 33.70%, fat 17.74, crude fiber 5.97, carbohydrate 27.75, calcium 0.24 and
iron 0.14. Dhal recovery by domestic method was 59.72%. Decortication decreased the levels
of crude fiber (to 0.24%), carbohydrates (27.36%) and calcium (56.64 mg) while the crude
protein (37.70%), fat (22.55%), iron (4.01 mg) and calorific values (463 K Cal) increased.
Concentration of antinutrients such as tannins, total free phenols, phytic acid and trypsin inliibitors
varied among the genotypes and domestic processing techniques altered them. Tannins and phytic
acid content increased with seed weight. Maximum reduction of tannins (47.26%) and trypsin
inhibitors (59.27%) was in PPCB samples. Total free phenols were reduced maximum by
decortication (57.66%) and phylates by presoaked pressure cooked broth rejected
seeds (27.00%). Tannins inversely influenced the physico-chemical characteristics, while trypsin
inhibitor levels did not affect them. Food intake, PER, DC, B V, NPU and NDP cal % of rats fed
winged bean diet were lower than those on albumin diet. Winged bean diet did not affect rat liver
and spleen weights. Thus, physico-chemical characteristics, nutrients, antinutrients varied. Pressure
cooked seeds promoted rat growth.
Description
Keywords
null