REMOVAL OF OLIGOSACCHARIDES FROM SOYBEAN WATER EXTRACTS BY ULTRAFILTRATION

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Abstract
The feasibility of using ultrafiltration (UF) for removal of oligosaccharides from aqueous extracts of soybeans was investigated. Soybeans were soaked, blanched, ground, prefiltered, and the resulting full‐fat extract processed in a hollow fiber UF unit. Initial permeate flux of 43‐60 L/m2/hr at 3.5% total solids decreased semi‐logarithmically to 13 L/m2/hr at 14% total solids. Low pH resulted in higher flux. Rates of removal of oligosaccharides closely followed theoretical behavior for a nonrejected solute during ultrafiltration and continuous diafiltration, and up to 96% could be removed by a two‐stage UF process. Final product assayed 60% protein, 35% fat and 0.6% oligosaccharides (dry basis).