Abstract
The concentration of skimmed milk proteins by polysaccharides such as gum arabic, arabinogalactan and apple pectin with a high content of methoxyl groups was studied. Investigation of the thermodynamic compatibility of skimmed milk proteins with these polysaccharides at different NaCl concentrations and pH has shown that above a certain polysaccharide concentration termed the ‘threshold of complete incompatibility’ the protein is almost completely excluded from the polysaccharide phase. Phase diagrams obtained for the systems: water-skimmed milk proteins-arabinogalactan, water-skimmed milk proteins-gum arabic and water-skimmed milk proteins-pectin, indicate that highly esterified apple pectin is superior to the other polysaccharides for concentrating skimmed milk proteins. The proposed method of concentration which may be called ‘membraneless isobaric osmosis' has a higher productivity and lower energy consumption than other methods of biopolymer concentration.
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