Affinity ranking of peptide-polyphenol non-covalent assemblies by mass spectrometry approaches

Energy Resolved Mass Spectrometry of peptide-polyphenol complexes was used to characterize the affinity of a selection of 21 polyphenols for peptides from human salivary basic Proline Rich Proteins (PRPb) having variable lengths. The affinity scale determined in the gas phase for a 14 amino acid long peptide is in agreement with results obtained in the liquid phase with the same PRPb probe immobilized on magnetic beads and those of sensory descriptive analysis of polyphenols astringency.