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Effects of the mode of the filtration processes on the fractionation of milk constituents by ultrafiltration

Effects of the mode of the filtration processes on the fractionation of milk constituents by ultrafiltration

Japanese Journal of Zootechnical Science 56(3): 204-214

In fractionation of cow's milk constituents by ultrafiltration with the module UFP-10 of Rhone-Poulenc-Chimie Fine, theoretical analyses were attempted by means of the theoretical equations to study the effects of pH, temperature, pre-heating and fat content of milk and the membrane varieties (IRIS 3038 and IRIS 3072). The theoretical analyses tested could be applied to the all experimental conditions of the present ultrafiltration. Permeability coefficient and membrane-permeable fraction of each milk constituent varied as a function of its physico-chemical characteristics within the range of the present experimental conditions. The performances of Ca, Mg and P, which form colloids in milk, were exclusively dependent upon the filtration conditions. Permeability coefficients of permeable milk solids, protein and lactose were affected solely by the properties of membrane. Permeability coefficients of K, Ca, Mg and P were higher in the cases of the membrane variety of IRIS 3072, whole milk and at 10.degree. C to 15.degree. C than in those cases of IRIS 3038, skim milk and at 50.degree. C. The values of permeability coefficients of Na and Cl were lower at pH 5.8 than at pH 6.7, while those values of K, Ca, Mg and P were higher at pH 5.8 than at pH 6.7. Permeability coefficient of Cl was insusceptible to the filtration conditions other than pH and also displayed very limited correlation with permeability coefficients of other 5 mineral components. Membrane-permeable fractions of protein, fat, lactose, Na, K and Cl were less influenced by the changes of filtration conditions. Membrane-permeable fractions of Ca, P and ash were intensely correlated mutually and increased or decreased when pH was lowered or the temperature was elevated, respectively. Molar ratio of Ca to P in colloidal calcium phosphate complexes, transiting between the permeable and non-permeable phase in accordance with the changes of filtration conditions, was 1.52 which was comparable with that of tri-calcium phosphate.

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