Odorant intensities and

Patty, F.A. and Yant, W.P. Odor Intensity and Symptoms Produced by Commercial Propane, Butane, Pentane, Hexane and Heptane Vapor, US Bureau of Mines, 1929. 

FIGURE 17.3 Odor intensity and odor description of green tea drinks before and after heating process. Retorting process 121°C, 10 minutes. UHT sterilization 134°C, 30 seconds. Odor intensity of nonheated green tea drink (control) 3. pH 6.2 (control), 5.6 (after retorting process), 6.1 (after UHT sterilization). 

LINEAR AND POWER FUNCTIONS RELATING SENSORY ODOR INTENSITY AND CONCENTRATION... 

Acetophenone has a high odor intensity and a low partition coefficient, thus it will have a high odor intensity on the detergent powder but a relatively low odor intensity on cloth since it prefers to stay with the aqueous phase. 

GREENBERG Odor Intensity and Molecular Hydrophobic Properties 179... 

The use of the QSAR technique known as the Hansch Approach in the investigation of odor intensity and odorant physico-chemical properties has indicated that hydrophobic properties of homologous series of compounds, not steric or polar properties, are highly correlated to the level of odor intensity. This was shown to be the case for literature odor threshold and suprathreshold data determined at different laboratories using various media. The poor correlation between odor intensity and the steric properties of molecules (Taft Steric Constant) which had been reported earlier by this author (11) have been further verified by the use of Charton and Verloop Sterimol steric parameters. 

Kemp, S. E. and Gilbert, A. N. (1997) Odor intensity and color lightness are correlated sensory dimensions, American Journal of Psychology, 110, 35 6. 

Another GC-0 technique, the posterior intensity method [77], proposes the measurement of a compound odor intensity and its posterior scoring on a previously determined scale. This posterior registration of the perceived intensity may cause a considerable variance between assessors. 

Another GC-O technique, the posterior intensity method [77], proposes the measurement of a compound odor intensity, and its posterior scoring on a previously determined scale. This posterior registration of the perceived intensity may cause a considerable variance between assessors. The attained results may generally be well correlated with detection frequency method results, and to a lesser extent, with dilution methods. In the above-mentioned research performed on the essential oils of Brazilian rosewood, this method was also used to give complementary information on the intensity of the linalool enantiomers [76]. 

The ratio of the concentration of an odorant to its odor threshold gives the odor activity value (OAV). This is often used to rank the olfactory importance of aroma constituents. However, the OAV concept has been criticized (18,19) because it assumes that a linear relationship exists between the odor intensity and the odorant concentration. This is in conflict with most accepted psychophysical laws based on logarithmic or exponential relationships (20). A recent article by Reineccius and coworkers confirms that OAVs do not represent the contribution of odorants in the overall aroma and that using OAVs to rank their contributions could result in a misinterpretation (21). 

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