59D-24

G. DÁVILA-ORTÍZ¹, V. Pérez-Florez², L. A. Chel-Guerrero², and D. Betancur-Ancona². (1) Depto. Graduados e Investigación en Alimentos, Escuela Nacional de Ciencia Biológicas, Carpio y plan de Ayala, Colonia Santo Tomas, México D.F., 11340, Mexico, (2) Laboratorio de Alimentos, Facultad de Ingeniería Química. UADY, Av. Juarez No. 421 Cd. Industrial, Mérida, Yucatán, 97288, Mexico

Phaseolus lunatus and Canavalia ensiformis are legumes that grow in Yucatan, México. Both of them have high levels of protein and carbohydrates, representing for this reason, a potential food for human and animal. The aim of this work was to obtain and characterize protein concentrates of these legume seeds. Phaseolus lunatus and Canavalia ensiformis Protein concentrates (PC) were obtained by isoelectric precipitation. The both flours presented a protein content of 27% and Nitrogen free content (NFE), of 64 and 55% respectively, while PC showed 71 and 74% of protein and the N.F.E. diminished until levels of 25 and 18% respectively. The amino acids profile indicated that both the flours and protein products were rich in lysine, but faulty in sulfur-containing amino acids. The in vitro digestibility was high in both concentrates 80 and 82% better than the flours digestibility (72.4 and 75.2% respectively). The PC obtention diminished antinutritious and toxic factors principally cyanogenic glycosides to innocuous level. The functional properties of P. lunatus PC: water absorption oil absorption and foam capacity, were better than those obtained for the respective flours; while similar values were showed by C. ensiformis PC and flours. This behaviour, was observed when emulsifying capacity was determined. The C. ensiformis PC apparent viscosity presented a decreasing in its value when pH increase and inverse behaviour with temperature decrease.

Session 59D, Food Chemistry: Proteins and Physicochemical Properties
1:00 PM - 4:30 PM, 2001-06-25 Room Hall D

2001 IFT Annual Meeting - New Orleans, Louisiana