Journal article

Alterations to the composition of casein micelles and retentate serum during ultrafiltration of skim milk at 10 and 40 degrees C

Dylan Z Liu, Michael G Weeks, David E Dunstan, Gregory JO Martin

INTERNATIONAL DAIRY JOURNAL | ELSEVIER SCI LTD | Published : 2014

Abstract

The composition of casein micelles and retentate serum were investigated during four-fold concentration of skim milk by ultrafiltration (UF) at 10 and 40 °C. Analysis of supernatants and pellets obtained by ultracentrifugation showed that while the concentration of soluble casein increased considerably during UF there was a net shift of casein from the serum to micelles at both temperatures. The hydration of casein micelles was higher at 10 °C than at 40 °C and increased slightly during UF. Dynamic light scattering measurements on diluted retentates did not reveal any permanent change in the average micelle diameter. During UF concentration of skim milk the progressive removal of calcium was..

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Grants

Funding Acknowledgements

Financial support for this work was provided by Dairy Innovation Australia Limited and the Australian Research Council. The authors are grateful for the instructive comments provided by the reviewers.