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A psychophysical investigation of binary bitter-compound interactions

Keast, Russell, Bournazel, Melanie M. E. and Breslin, Paul A. S. 2003, A psychophysical investigation of binary bitter-compound interactions, Chemical senses, vol. 28, no. 4, pp. 301-313.

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Title A psychophysical investigation of binary bitter-compound interactions
Author(s) Keast, Russell
Bournazel, Melanie M. E.
Breslin, Paul A. S.
Journal name Chemical senses
Volume number 28
Issue number 4
Start page 301
End page 313
Publisher Oxford University Press
Place of publication Oxford, England
Publication date 2003
ISSN 0379-864x
1464-3553
Keyword(s) additive
bitter taste
suppression
synergy
taste interactions
taste psychophysics
Summary The aim of this study was to determine if taste interactions occur when bitter stimuli are mixed. Eight bitter stimuli were employed: denatonium benzoate (DB), quinine-HCl (QHCl), sucrose octaacetate (SOA), urea, L-tryptophan (L-trp), L-phenylalanine (L-phe), ranitidine-HCl, and Tetralone. The first experiment constructed individual psychophysical curves for each subject (n = 19) for each compound to account for individual differences in sensitivities when presenting bitter compounds in experiment 2. Correlation analysis revealed two groupings of bitter compounds at low intensity (1, L-trp, L-phe, and ranitidine; 2, SOA and QHCl), but the correlations within each group decreased as the perceived intensity increased. In experiment 2, intensity ratings and two-alternative forced-choice discrimination tasks showed that bitter compounds generally combine additively in mixture and do not show interactions with a few specific exceptions. The methods employed detected synergy among sweeteners, but could not detect synergy among these eight bitter compounds. In general, the perceived bitterness of these binary bitter-compound mixtures was an additive function of the total bitter-inducing stimuli in the mouth.
Notes This is a pre-copy-editing, author-produced PDF of an article accepted for publication by Chemical senses following peer review. The definitive publisher-authenticated version Keast, Russell, Bournazel, Melanie M. E. and Breslin, Paul A. S. 2003, A psychophysical investigation of binary bitter-compound interactions, Chemical senses, vol. 28, no. 4, pp. 301-313. is available online at http://dx.doi.org/10.1093/chemse/28.4.301
Language eng
Field of Research 170112 Sensory Processes, Perception and Performance
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2003, Oxford University Press
Persistent URL http://hdl.handle.net/10536/DRO/DU:30004131

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