Dielectric spectroscopy study of water dynamics in frozen bovine milk

Daniel Agranovich, Paul Ben Ishai, Gil Katz, Dror Bezman, Yuri Feldman

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Bovine milk is a complex colloidal liquid exhibiting a multi-scaled structure. It is of particular importance, both commercially and scientifically, to investigate both its dynamic and structural properties. In the current study we have employed the broadband dielectric spectroscopy (BDS) technique in the frequency range of 10-1-106 Hz and the temperature range of 176-230 K in order to examine the molecular structure and dynamics of quenched bovine milk. Four dielectric relaxation processes were identified. Three of them are associated with water in its different forms: water-lactose complexes, bulk hexagonal and cubic ices. The fourth process is attributed to domain wall relaxations linked to the presence of micro-cracks in the ice structures. In addition, the first process, attributed to water-lactose complexes, obeys the Meyer-Neldel compensation law and can be taken as evidence of differing interfaces of these complexes with the bulk water of the milk, mediated by the lactose concentration. Furthermore, an intriguing structural-dynamic transition around 200 K was observed. Considering the mentioned above, we conclude that our results emphasize the structural and dynamical significance of water in bovine milk.

Original languageEnglish
Pages (from-to)390-396
Number of pages7
JournalColloids and Surfaces B: Biointerfaces
Volume141
DOIs
StatePublished - 1 May 2016
Externally publishedYes

Keywords

  • Bovine milk
  • Dielectric relaxation
  • Dielectric spectroscopy
  • Ice
  • Lactose
  • Water

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