Dehydrated aqueous extracts of rice-soybean at different proportions (100:0, 90:10, 80:20, 70:30, 60:40 and 50:50%) were assessed for nitrogen solubility index (NSI), protein dispersibility index (PDI), emulsifying activity (EA) and emulsion stability (ES) in order to verify their potential use as food ingredients. Dehydrated aqueous extracts was manufactured by soaking, disintegration, centrifugation, addition of citric acid, boiling and spray-drying. The results indicated that increasing soybean proportion from 0 to 50% showed an increase in the soluble nitrogen in water, EA and ES, and a decrease in the NSI and PDI. However, the dispersible protein in water increased up to 10% soybean in the mixture, beyond which, it decreased with increased soybean proportion. Therefore, the dehydrated aqueous extracts with 10, 20 and 30% soybean, are recommended for use as ingredient in meat, confectionery products, chocolate, soups, sauces, creme and beverages manufacture, while those with 40 and 50% of soybean in the mixture, would be desirable as meat extenders, processed cheeses and mayonnaise.
nitrogen solubility index; protein dispersibility index; emulsifying activity; emulsion stability; dehydrated aqueous extract
