Astringency - Protein-tannins interaction: Driving forces of polyphenols-to-protein binding
6 important questions on Astringency - Protein-tannins interaction: Driving forces of polyphenols-to-protein binding
Which residues of proteins are involved in the interaction with polyphenols? And how is this called?
Why is proline attractive for binding tannins (or polyphenols)?
What is the difference between Halpha and Hdelta in proline?
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What is the result when proteins and polyphenols interact?
Which 2 types of polyphenol-to-protein complexation can be distinguished?
- Monodentate
- Multidentate
What is the difference between monodentate and multidentate polyphenol-to-protein complexation?
- Monodentate
- monomeric polyphenols with relatively low affinity for proteins
- polyphenol-to-protein molar ratio: very high --> to induce precipitation
- polyphenols create hydrophobic shell around proteins --> aggregation --> precipitation
- Multidentate
- multimeric polyphenols (e.g. Proanthocyanidins or hydrolysable tannins) with high affinity for proteins
- polyphenol-to-protein molar ratio: low
- cross-linkers between proteins --> aggregates --> precipitation
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