Dehydrated rice-soybean porridges at different proportions (100:0, 90:10, 80:20, 70:30, 60:40 and 50:50%) were assessed for solubility and whipping properties, in order to verify their use as food ingredients. Dehydrated porridge was manufactured by soybean seed dehulling, blanching, disintegration of blanched rice and soybean, homogenization and spray drying. Chemical analysis showed that increasing soybean proportion from 0 to 50%, resulted in an increase in the soluble nitrogen in water, nitrogen solubility index (NSI), dispersible protein in water, protein dispersibility index, expansion and syneresis of foam, and a decrease in the foam volume after 30 and 60 min. However, NSI of only dehydrated porridge with more than 10% soybean showed the highest values, whereas the whipping properties values were not significant in non dehydrated porridge. Therefore, the dehydrated rice-soybean porridges with 20, 30, 40 and 50% soybean, would be recommended for use in porridges, beverages, soups and sauces, where the presence of foam is not desirable. No trypsin inhibitor activity was detected in studied dehydrated porridges.
Nitrogen solubility index; protein dispersibility index; foam expansion; foam volume; foam syneresis; rice-soybean mixture; dehydrated porridge
