Aldehyde threshold odor intensity

Aldehyde and ketone suprathreshold odor intensity correlated well with log P and HB as shown in Table II. No significant relationship between steric or electronic parameters with aldehyde-ketone suprathreshold data was found with the exception of the Sterimol parameter L which was highly correlated to log P (R=0.95). Aldehyde threshold data weis found to be linearly related to log P as shown in equations 10 eind 13. The same data was poorly correlated with E andvas shown in Table II (eq. 12, 15 and 16). Note that two different aldehyde threshold data sets from two different sources produced very similar equations having slopes, intercepts, correlation coefficients and standard deviations which are not statistically different at the 95% level of confidence (eq. 10 and 13). 

Another area of further study is the reproducibility and accuracy of derived predictive equations. Two different data sets of aliphatic aldehyde threshold values in water were subjected to QSAR techniques to determine whether log P can be used to accurately reproduce predictive equations for odor intensity data of a compound in a given medium determined by two different laboratories. Results in Table II indicate that equations 10 and 13 have slopes, intercepts, correlation coefficients and standard deviations which are not statistically different at the 95% level of confidence. Both data sets also produced equations giving poor correlations of E and log (1/c) which were not statistically significant. 

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