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Foods 2018, 7(10), 166; https://doi.org/10.3390/foods7100166

Fractionation of Glycomacropeptide from Whey Using Positively Charged Ultrafiltration Membranes

Department of Chemical and Biological Engineering, University of Wisconsin, 1605 Linden Dr., Madison, WI 53706, USA
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Received: 13 July 2018 / Revised: 22 August 2018 / Accepted: 5 October 2018 / Published: 9 October 2018
(This article belongs to the Special Issue Membrane Processing Technology in the Food Industry)
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Abstract

Fractionation of the bovine glycomacropeptide (GMP) from the other proteins in cheese whey was examined using ultrafiltration membranes surface modified to contain positively charged polymer brushes made of polyhexamethylene biguanide. By placing a strong positive charge on a 1000 kDa ultrafiltration membrane and adjusting the pH of whey close to the isoelectric point of GMP, a 14-fold increase in selectivity was observed compared to unmodified membranes. A one stage membrane system gave 90% pure GMP and a three-stage rectification system gave 97% pure GMP. The charged membrane was salt-tolerant up to 40 mS cm−1 conductivity, allowing fractionation of GMP directly from cheese whey without first lowering the whey conductivity by water dilution. Thus, similarly sized proteins that differed somewhat in isoelectric points and were 50–100 fold smaller than the membrane molecular weight cut-off (MWCO), were cleanly fractionated using charged ultrafiltration membranes without water addition. This is the first study to report on the use of salt-tolerant charged ultrafiltration membranes to produce chromatographically pure protein fractions from whey, making ultrafiltration an attractive alternative to chromatography for dairy protein fractionation. View Full-Text
Keywords: sieving coefficient; phenylketonuria; polyhexamethylene biguanide sieving coefficient; phenylketonuria; polyhexamethylene biguanide
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Arunkumar, A.; Etzel, M.R. Fractionation of Glycomacropeptide from Whey Using Positively Charged Ultrafiltration Membranes. Foods 2018, 7, 166.

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