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The purpose of this study was to examine the ability of the artificial taste sensor to evaluate the bitterness of drugs by comparing the responses of the taste sensor with documented responses of human TASTE2 receptors (hTAS2Rs). For this purpose 22 bitter compounds, used as ingredients of pharmaceutical medicines in Japan and known ligands of hTAS2Rs, were selected for testing. Their solutions (0.01, 0.03, 0.1 mM) were evaluated by five different taste sensors (AC0, AN0, BT0, C00, AE1). Correlations between physicochemical parameters of the compounds and the responses of the taste sensors and hTAS2Rs were evaluated. From taste sensor measurements, diphenidol, haloperidol, diphenhydramine, dextromethorphan and papaverine, all ligands of hTAS2R 10 and/or hTAS2R14, were predicted to express strong bitterness, surpassing that of quinine. Responses of taste sensors BT0 were found to be significantly correlated with responses of hTAS2R14. High log P values (≧2.73) and responses of hTAS2R14 were also significantly correlated (** p&lt;0.01, chi-square test). In conclusion, taste sensor BT0 is highly sensitive to bitterness and correlates significantly with hTAS2R14, making it useful for evaluating the bitterness of hydrophobic compounds which respond to hTAS2R14 and their inhibitors.

The Utility of the Artificial Taste Sensor in Evaluating the Bitterness of Drugs: Correlation with Responses of Human TASTE2 Receptors (hTAS2Rs)