Delipidation of a whey protein concentrate by electroacidification with bipolar membranes.
The separation of residual fats from whey protein concentrates (WPC) results in a better nutritional and functional utilization of this product. Bipolar membrane electroacidification (BMEA) technology allows acidification and demineralization of solutions without any salt addition. The principle of BMEA is based on proton formation from water molecule dissociation at the bipolar membrane interface. The objective of this work was to determine the effect of an electroacidification treatment at pH 4.5 on the precipitation of lipids. WPC electroacidification was carried out with or without preliminary demineralization by conventional electrodialysis. The effect of ionic strength on lipid precipitation rates was also evaluated by dilution of the WPC samples. Lipid precipitation levels of 35-39% were obtained using the electroacidification process without a dilution step, while the combination of BMEA and dilution of the WPC resulted in a decrease in lipid content by six-fold from 0.76 to 0.21%.
Shee
Fabrice Lin Teng
FL
Institute of Nutraceuticals and Functional Foods and Dairy Research Group STELA, Department of Food Sciences and Nutrition, Laval University, Quebec G1K 7P4, Canada.
Angers
Paul
P
Bazinet
Laurent
L
D011232:Chemical Precipitation; D004563:Electrochemistry; D006863:Hydrogen-Ion Concentration; D008055:Lipids / Q000302:isolation & purification*; D008567:Membranes, Artificial; D008894:Milk Proteins / Q000737:chemistry*; D000067816:Whey Proteins
D008055:Lipids; D008567:Membranes, Artificial; D008894:Milk Proteins; D000067816:Whey Proteins