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Astringent compounds suppress taste responses in gerbil
S S Schiffman1, M S Suggs, S A Simon
1Department of Psychiatry, Duke University, Durham, NC 27706.
Brain Research
|November 6, 1992
Summary
Astringent compounds like tannic acid and aluminum salts inhibit taste responses to various tastants by affecting taste cell pathways. This inhibition, particularly from tannic acid, suggests a direct role in the astringent taste sensation.
Area of Science:
- Neuroscience
- Sensory Science
- Taste Perception
Background:
- Astringency is characterized by oral drying and puckering sensations.
- The neural mechanisms underlying astringency and its interaction with other tastes are not fully understood.
Purpose of the Study:
- To investigate the interactive effects of astringent compounds with various tastants.
- To elucidate the role of astringency in modulating taste receptor and transport pathways.
Main Methods:
- Electrophysiological recordings of the whole chorda tympani nerve in gerbils.
- Testing astringent compounds (tannic acid, aluminum salts, gallic acid) with diverse tastants (salts, acids, sweeteners, bitter compounds).
- Controlling for acidity effects using hydrochloric acid.
Main Results:
- Tannic acid significantly inhibited responses to salts, acids, sweeteners, and bitter compounds, suggesting it affects multiple taste pathways.
- Aluminum salts also inhibited responses to all tested stimuli.
- Gallic acid, weakly astringent, showed minimal effects, indicating a dose-dependent or structural requirement for inhibition.
Conclusions:
- Tannic acid and aluminum salts likely inhibit various transport pathways and receptors in taste cells.
- This inhibition of multiple pathways may be a key component of the astringent taste sensation.
- Astringency is not solely due to acidity but involves direct interactions with taste transduction mechanisms.