Affiliation:
1. Biosciences and Food Technology, School of Science RMIT University Melbourne 3083 Vic. Australia
2. Department of Innovation and Application Hela Spice Australia 119 Woodlands Drive Melbourne 3195 Vic. Australia
Abstract
SummaryThe physiochemical properties of five commercially available soy protein isolates (SPI) from different manufacturers and one soy protein concentrate were analysed. Despite their identical botanical origin and an almost interchangeable molecular weight profile, remarkable differences were revealed in their solubility, protein dispersibility index (PDI), water holding capacity (WHC), zeta potential (measured at different pHs) and particle size distribution. Protein solubility and PDI values, which can be considered as a simple and reliable measure of soy protein powder's suitability for industrial formulations such as extrusion premixes, revealed to be strongly intercorrelated, with SPI A, B and E showing higher values at pH 7.0 and 9.0 as compared to their counterparts (sample C and D). WHC appeared to be less influenced by solubility, but greatly by particle size distribution. SPI A, B and E showed largest increase in diameter upon hydration (‘swelling’) and gave the highest WHC.
Subject
Industrial and Manufacturing Engineering,Food Science
Reference75 articles.
1. ABARES. (2021).Series Agricultural commodities: March quarter 2021 Australian Bureau of Agricultural and Resource Economics and Sciences. Retrieved fromhttps://awe.gov.au/abares/research‐topics/agricultural‐outlook.
2. Principles and Reactions of Protein Extraction, Purification, and Characterization
3. Extrusion of food proteins;Arêas J.G.;Critical Reviews in Food Science and Nutrition,1992