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• W3185780510 abstract "Astringency is one of the most complex oral sensations. This dry, puckering mouthfeel occurs when consuming wine, tea, or other foods containing polyphenols. The exact mechanism behind this dry mouthfeel is not completely understood. Here, we describe a systematic tribological approach to measure model and real saliva to understand the specific role of the salivary proteins (mucins and proline-rich proteins (PRPs)) on lubrication-based astringency. Our approach reveals that there are two routes towards lubrication losses, partly involving irreversible molecular mechanisms for which the order of reactivity matters. For human saliva, we find two lubrication mechanisms: (I) Using phenolic compounds, we find aggregation-induced lubrication losses due to hydrogen bond formation, which depend critically on phenol size: large polyphenols allow for aggregation-induced lubrication losses, but small phenols do not. (II) For metal salts combined with saliva, we observe aggregation without lubrication losses as a result of electrostatic interactions. We find that lubrication losses are caused by the specific removal of the salivary PRP layer, whereas mucin aggregation in the presence of PRPs does not lead to lubrication losses. Additionally, we show that the addition of solvents that are able to reduce protein-polyphenol hydrogen bonding (e.g. ethanol) can prevent lubrication losses. Lubrication losses can also be compensated by the addition of highly viscous fluids (glycerol) that can provide viscous lubrication. • Large polyphenols aggregate PRPs leading to salivary lubrication losses related to astringency perception. • Mucin aggregation does not cause salivary lubrication losses when PRPs remain unaffected. • Salivary lubrication losses can be prevented by the addition of hydrogen-bond donors or highly viscous fluids." @default.
• W3185780510 created "2021-08-02" @default.
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• W3185780510 date "2021-12-01" @default.
• W3185780510 modified "2023-10-14" @default.
• W3185780510 title "A tribological approach to astringency perception and astringency prevention" @default.
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• W3185780510 doi "https://doi.org/10.1016/j.foodhyd.2021.106951" @default.
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