Abstract

SALINAS MORENO, Y; HERRERA CORREDOR, J.A; CASTILLO MERINO, J  and  PEREZ HERRERA., P. Cambios físico-químicos del almidon durante la nixtamalización del maíz en variedades con diferente dureza de grano. ALAN [online]. 2003, vol.53, n.2, pp.188-193. ISSN 0004-0622.

SUMMARY. Physicochemical changes in corn starch during alkaline-cooking in varieties with different kernel hardness. Changes in starch characteristics caused by alkaline-cooking in two corn genotypes (hard and soft) were studied in the present work. Color, pH, pasting properties (Brabender viscoamylograph), water sorption, solubility, swelling power and thermal analysis (Diferential scanning calorimetry) were determined in starches previously extracted, from raw and alkaline-cooked hard and soft corns. A reduction in maximum viscosity peak, temperature at the endothermic peak and swelling power at 90^oC, and an increase in solubility was observed in starches obtained from both hard and soft corn after alkaline-cooking. Starch from hard corn showed an increment in initial pasting temperature after alkaline-cooking. Alkaline-cooking induced higher modifications in hard than in soft corn starch, probably as a result of its endosperm type and grain hardness, although optimum cooking times were used for each corn genotype

Keywords : : Zea mays; starch changes; alkaline-cooking; gelatinization.