Probe mobility in native phosphocaseinate suspensions and in a concentrated rennet gel: effect of probe flexibility and size

S. Salami, C. Rondeau-Mouro, J.P.M. van Duynhoven, F. Mariette

Research output: Contribution to journalArticleAcademicpeer-review

14 Citations (Scopus)

Abstract

Pulsed field gradient nuclear magnetic resonance and proton nuclear magnetic resonance relaxometry were used to study the self-diffusion coefficients and molecular dynamics of linear (PEGs) and spherical probes (dendrimers) in native phosphocaseinate suspensions and in a concentrated rennet gel. It was shown that both the size and the shape of the diffusing molecules and the matrix topography affected the diffusion and relaxation rates. In suspensions, both translational and rotational diffusion decreased with increasing casein concentrations due to increased restriction in the freedom of motion. Rotational diffusion was, however, less hindered than translational diffusion. After coagulation, translational diffusion increased but rotational diffusion decreased. Analysis of the T2 relaxation times obtained for probes of different sizes distinguished the free short-chain relaxation formed from a few monomeric units from (i) the relaxation of protons attached to long polymer chains and (ii) the short-chain relaxation attached to a rigid dendrimer core.
Original languageEnglish
Pages (from-to)5870-5879
JournalJournal of Agricultural and Food Chemistry
Volume61
Issue number24
DOIs
Publication statusPublished - 2013

Keywords

  • diffusing wave spectroscopy
  • glucono-delta-lactone
  • nmr self-diffusion
  • casein micelles
  • skim milk
  • rheological properties
  • pfg-nmr
  • electron-microscopy
  • poly(vinyl alcohol)
  • induced aggregation

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