Influence of added lyophilized butter serum on the heat stability of unconcentrated and concentrated bovine milk

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Abstract

The influence of added lyophilized butter serum on the heat stability of milk was investigated. The addition of lyophilized serum from salted butter to unconcentrated skimmed milk (SM) reduced the heat coagulation time (HCT) at, and increased the pH of, the maximum in the pH-HCT profile and caused disappearance of the minimum. NaCl had similar effects on the heat stability of SM as lyophilized salted butter serum, whereas lyophilized serum from unsalted butter had little effect. The addition of lyophilized salted butter serum to concentrated skimmed milk (CSM) also shifted the pH of maximum heat stability to a higher value and, at certain concentrations, increased the maximum HCT; similar effects were obtained on addition of NaCl, but lyophilized serum from unsalted butter had little effect. These results suggest that the effects of lyophilized serum from salted butter on the heat stability of SM or CSM are due primarily to the presence of a high level of NaCl in this serum.

Original languageEnglish
Pages (from-to)18-21
Number of pages4
JournalInternational Journal of Dairy Technology
Volume59
Issue number1
DOIs
Publication statusPublished - Feb 2006

Keywords

  • Butter serum
  • Heat stability
  • Milk
  • NaCl
  • Phospholipids

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