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Chemical Senses 5: 93-98,
© 1980

research-article

Enhancement of the perceived sucrose sweetness in the rat by thaumatin

X. Dugas du Villard, H. van der Wel* and J.N. Brouwer

Unilever Research Saint-Denis, France Unilever Research Vlaardingen, The Netherland

*Please address correspondence to: H. Van der Wel, Unilever Research, P.O. Box 114, 3130 AC Vlaardingen, The Netherlands

After conditioned aversion to a 0.18 mol/l sucrose solution rats do not reject a solution of 0.03 mol sucrose per l (near threshold) or a solution of thaumatin (0.2 g/l), which elicits no response in the rats' taste nerves. However, a mixture of the latter two solutions is rejected just as the 0.18 mol/l sucrose solution. This means that for the rat the mixture has a sucrose-like taste. So, thaumatin enhances sucrose-like sweetness in this animal. Electrophysiological measurements in the chorda tympani indeed show an enhancement of the sucrose response of almost 20 percent by the addition of thaumatin (0.2 g/l) to a sucrose solution of 0.5 mol/l.


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