31P NMR assessment of the phosvitin-iron complex in mayonnaise

Donny W.H. Merkx*, Faruk Delić, Peter A. Wierenga, Marie Hennebelle, John P.M. van Duynhoven

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)

Abstract

Lipid oxidation is the main reason for the limited shelf life of mayonnaise. One of the main catalysts of this process is iron, which is introduced in its ferric (Fe(III)) form via phosvitin, an egg yolk phosphoprotein rich in phosphoserines. The binding of Fe(III) to phosvitin and its ability to establish a redox couple with Fe(II) is believed to determine the oxidation rate of unsaturated lipids. In this work, a 31P NMR based method was developed to quantify loading of phosvitin with Fe(III) and its reductive release. Both features could be quantified in model phosvitin solutions by exploiting the paramagnetic broadening of 31P NMR signal of phosphoserine residues by Fe(III). This method was then successfully applied to quantify the phosvitin-Fe(III) loading in mayonnaise water phase by liquid NMR, whereas 31P NMR MAS could only provide a qualitative measure. The 31P NMR method showed a direct relation between loading of the Fe(III)-phosvitin complex and lipid oxidation.

Original languageEnglish
Pages (from-to)540-547
Number of pages8
JournalMagnetic Resonance in Chemistry
Volume57
Issue number9
Early online date25 Nov 2018
DOIs
Publication statusPublished - Sep 2019

Keywords

  • P NMR
  • Fe(III)-phosvitin
  • Lipid Oxidation
  • Mayonnaise
  • NMR
  • Paramagnetic broadening

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