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首页> 外文期刊>Chemical Senses >A Complex Relationship among Chemical Concentration,Detection Threshold,and Suprathreshold Intensity of Bitter Compounds
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A Complex Relationship among Chemical Concentration,Detection Threshold,and Suprathreshold Intensity of Bitter Compounds

机译：苦味化合物的化学浓度，检测阈值和超阈值强度之间的复杂关系

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Detection thresholds and psychophysical curves were established for caffeine,quinine-HCI(QHCI),and propylthiouracil(PROP)in a sample of 33 subjects(28 female mean age 24+-4).The mean detection threshold(+-standard error)for caffeine,QHCI,and PROP was 1.2+-0.12,0.0083+-0.001,and 0.088+-0.07 mM,respectively.Pearson product-moment analysis revealed no significant correlations between detection thresholds of the compounds.Psychophysical curves were constructed for each bitter compound over 6 concentrations.There were significant correlations between incremental points of the individual psychophys ical curves for QHCI and PROP.Regarding caffeine,there was a specific concentration(6 mM)below and above which the incremental steps in bitterness were correlated.Between compounds,analysis of psychophysical curves revealed no correlations with PROP,but there were significant correlations between the bitterness of caffeine and QHCI at higher concentrations on the psychophysical curve(P<0.05).Correlation analysis of detection threshold and suprathreshold intensity within a compound revealed a significant correlation between PROP threshold and suprathreshold intensity(r=0.46-0.4,P<0.05),a significant negative correlation for QHCI(r=-0.33 to-0.4,P<0.05),and no correlation for caffeine.The results suggest a complex relationship between chemical concentration,detection threshold,and suprathreshold intensity.
机译：建立了33名受试者（28名女性平均年龄为24 + -4）的样本中咖啡因，奎宁-HCl（QHCI）和丙基硫尿嘧啶（PROP）的检测阈值和心理生理曲线。咖啡因，QHCI和PROP分别为1.2 + -0.12、0.0083 + -0.001和0.088 + -0.07 mM.Pearson产物矩分析表明，化合物的检测阈值之间无显着相关性。针对每种苦味化合物构建了心理生理曲线超过6个浓度.QHCI和PROP的各个心理学曲线的增量点之间存在显着的相关性。关于咖啡因，低于和高于6 mM的特定浓度与高于该浓度的苦味的增量步骤相关。化合物之间，分析之间心身曲线的变化与PROP无相关性，但在心身曲线上较高浓度的咖啡因和QHCI之间存在显着相关性（P <0.05）。化合物中检测阈值和阈上强度的相关分析表明，PROP阈值与阈上强度之间具有显着的相关性（r = 0.46-0.4，P <0.05），与QHCI显着负相关（r = -0.33至-0.4，P < 0.05），与咖啡因无相关性。结果表明化学浓度，检测阈值和阈上强度之间存在复杂的关系。

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