Journal
INTERNATIONAL DAIRY JOURNAL
Volume 20, Issue 2, Pages 128-131Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.idairyj.2009.08.007
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Funding
- Dairy Innovation Australia
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Samples of raw skim milk, ultrafiltration/diafiltration retentate, concentrated retentate and milk protein concentrate powder (MPC80) from a single commercial production run were analysed using photon correlation spectroscopy. Measurements revealed insignificant differences in casein micelle size between the samples. In addition, there was no discernable difference between raw skim milk and MPC powder dissolved at 60 degrees C in the amount of casein remaining in supernatants from centrifugation at either 25,000 x g or 174,200 x g. Casein micelles did not appear to be altered during manufacture of MPC. The rennet gelation behaviour of reconstituted MPC was compared with raw skim milk. Reconstituted MPC did not coagulate unless supplemented with approximately 2 mm calcium chloride, which was attributed to the mineral removal during ultrafiltration/diafiltration. Addition of sufficient calcium could restore rennet coagulation kinetics and gel strength of reconstituted MPC to approximately that of raw skim milk. (C) 2009 Elsevier Ltd. All rights reserved.
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