Abstract
ABSTRACTWater extracts of defatted soy flour were prepared by multiple extraction and centrifugation. Ultrafiltration of extracts in hollowfiber units showed significant deviation from ideal behavior for removal of nonprotein components, probably due to solute‐solute and solute‐membrane interactions. These interactions affected the retentate composition as well as the yield of protein. Membrane adsorption losses increased with feed concentration and were higher for the XM than for the PM series of membranes. A retentate washing step, such as the continuous diafiltration mode of operation, was necessary to produce a true protein isolate. Overall yield of protein was 86% of that in the defatted soy flour.
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