Friction 2022, 10(1): 167-178 https://doi.org/10.1007/s40544-021-0494-4

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Open Access | Issue | Published: 29 April 2021

Influence of two polyphenols on the structure and lubrication of salivary pellicle: An in vitro study on astringency mechanism

Show Author's Information Hide Author's Information Lei LEI, Yue TANG, Jing ZHENG(

), Genlei MA, Zhongrong ZHOU

Tribology Research Institute, Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China

Keywords:

lubrication, structure, astringency, salivary pellicle, polyphenol

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LEI L, TANG Y, ZHENG J, et al. Influence of two polyphenols on the structure and lubrication of salivary pellicle: An in vitro study on astringency mechanism. Friction, 2022, 10(1): 167-178. https://doi.org/10.1007/s40544-021-0494-4

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Abstract

This study investigated the influence of two polyphenols on the structure and lubrication of the salivary pellicle, aiming to extend the understanding of astringency mechanisms. The salivary pellicle was prepared by the adsorption of human whole saliva on the enamel substrate. Low-astringency catechin and high-astringency tannic acid were used as astringents. The changes induced by the two polyphenols in the structure and lubrication of the salivary pellicle were examined using quartz crystal microbalance with dissipation (QCM-D) and nano- indentation/scratch technique. The salivary pellicle suffers from changes in structure and physical properties owing to protein dehydration and protein-polyphenol complexation when encountering polyphenolic molecules, causing increases in the roughness and contact angle but a decrease in the load-bearing capacity. Therefore, the lubrication performance of the salivary pellicle is impaired, leading to an increase and fluctuation of the friction coefficient. The intensity of astringency has a strong positive correlation with the water contact angle, surface roughness, and friction coefficient of the salivary pellicle. In summary, astringency is a tactile perception driven by the roughness and wettability of the salivary pellicle rather than oral lubrication, and increased intraoral friction is an inevitable consequence of astringency. The findings of this study will help promote and assist the objective evaluation of astringency.

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About this article

Influence of two polyphenols on the structure and lubrication of salivary pellicle: An in vitro study on astringency mechanism

Show Author's information Hide Author's Information Lei LEI, Yue TANG, Jing ZHENG(

), Genlei MA, Zhongrong ZHOU

Tribology Research Institute, Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China

Abstract

Keywords: lubrication, structure, astringency, salivary pellicle, polyphenol

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Acknowledgements

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Publication history

Received: 25 September 2020

Revised: 23 December 2020

Accepted: 18 January 2021

Published: 29 April 2021

Issue date: January 2022

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51675449 and 51535010), the National Defense Science and Technology Key Laboratory Fund (614220206021802), and the 111 Project (B20008).

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