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Related Experiment Video

Updated: Jul 4, 2026

Tea Aroma Analysis Based on Solvent-Assisted Flavor Evaporation Enrichment

Tea Aroma Analysis Based on Solvent-Assisted Flavor Evaporation Enrichment

Published on: May 26, 2023

A physiological model of tea-induced astringency.

A Nayak¹, G H Carpenter

¹Salivary Research Unit, King's College London Dental Institute, Guy's Hospital, London, SE1 9RT, United Kingdom.

Physiology & Behavior

|July 2, 2008

Summary

Salivary proteins reduce the mouthfeel of astringency. Washing the mouth with water increased astringency perception, while chewing decreased it, indicating saliva

Area of Science:

Sensory Science
Oral Biology

Background:

Astringency, a dry mouthfeel from polyphenols in foods like tea and wine, is poorly understood.
Salivary proteins, such as proline-rich proteins and histatins, bind to polyphenols, but the mechanism of astringency perception remains unclear.

Purpose of the Study:

To investigate the role of saliva volume and salivary proteins in the perception of astringency.
To determine how salivary protein concentration affects the oral sensation of astringency.

Main Methods:

Subjects tasted black tea after protocols to decrease (water rinse) and increase (chewing) saliva volume.
Salivary protein levels and oral mucosal wetness were measured under different conditions.
Protein interactions following water washout were analyzed.

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Main Results:

Astringency perception increased after rinsing the mouth with water and decreased after chewing.
Water rinsing reduced salivary protein levels, while chewing increased them above resting levels.
Salivary proteins were identified as interacting with polyphenols, suggesting an inhibitory role.

Conclusions:

Salivary proteins in solution inhibit the perception of astringency.
Astringency is mediated, in part, by salivary proteins adhering to oral mucosal cells.
Modulating salivary protein levels can alter astringency perception.