S. Tempere, M. H. Schaaper, E. Cuzange, G. de Revel, G. Sicard
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Masking of Several Olfactory Notes by Infra-threshold Concentrations of 2,4,6-Trichloroanisole
Among wine defects, 2,4,6-trichloroanisole has a specific impact on wine perception. In addition to giving to the wine an unpleasant odor, 2,4,6-trichloroanisole has a masking effect on notes. In this study, the specificity and efficacy of the masking effect of 2,4,6-trichloroanisole was tested at infra- and supra-threshold concentrations. A simplified model of a binary mixture was also studied for in-depth analysis of this phenomenon.
Techniques used included sensory analysis (odor profiling), psychophysical tests (threshold measurement and triangle test), chemical analyses (GC-MS), and a mono/dichorhinic stimulation paradigm, to test the hypothesis of peripheral interaction.
The results revealed that TCA had a masking effect on a range of aromatic notes, even at infra-threshold concentrations. However, they also showed counteraction of odorant specificity by 2,4,6-trichloroanisole. The origin of this masking effect was also discussed. The results suggested that this interaction can be assumed to take place at receptor level.
This study provided experimental confirmation of the widespread idea that constituents in non-perceptible concentrations influence the perceived quality of mixtures of odorous compounds.
Moreover, this type of olfactory model may improve our understanding of combinatorial olfactory encoding at the peripheral level.
期刊介绍：
Coverage in Chemosensory Perception includes animal work with implications for human phenomena and explores the following areas:
Identification of chemicals producing sensory response;
Identification of sensory response associated with chemicals;
Human in vivo response to chemical stimuli;
Human in vitro response to chemical stimuli;
Neuroimaging of chemosensory function;
Neurological processing of chemoreception;
Chemoreception mechanisms;
Psychophysics of chemoperception;
Trigeminal function;
Multisensory perception;
Contextual effect on chemoperception;
Behavioral response to chemical stimuli;
Physiological factors affecting and contributing to chemoperception;
Flavor and hedonics;
Memory and chemoperception.
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