Fragrance quantitative measurement

Turning now to the effects of analysis upon the objective quantitative measurement of fragrance performance, we broach a subject whose outlines are only just beginning to take shape and whose impact will be felt largely in the future. 

An odour standard of n-alkane vapours is used to calibrate sensitivity and specificity of the zNose . Specificity is what allows the instrument to recognize known chemicals and/or chemical groups (odour signatures) and to deliver the appropriate alarms. The zNose is an ultra-fast GC which separates and measures the concentration of the individual chemicals of an odour directly, typically in 10 seconds. Individual chemicals are recognized by their retention time relative to the retention times of the linear-chain alkanes. Tabulating the retention times and detector counts (cts) provides a complete and quantitative measure of any odour or fragrance. 

Development of Fragrances with Functional Properties by Quantitative Measurement of Sensory and Physical Parameters... 

In the past five years, the quantitative measurement of quality, intensity, duration and hedonics of flavors and fragrances has become important. The measurements are used both for comparison of new products to those on the market and for substantiation of performance claims. For this last measurement the use of naive panels which reflect the opinions of the potential consumer becomes important. Examples of the types of measurements needed are a) odor and flavor intensities of ingredients and finished products, b) substantivity of fragrances on skin and c) the effect of solvent on the odor intensity of a fragrance. Although the discipline of physical chemistry can be... 

In the previous chapters, the methods of RP and NP HPLC have been discussed in detail. These methods are ideally suited for qualitative and quantitative analytical investigations of complex mixtures of substances. However, they do not allow any statement about the chiral composition of the analyte. Therefore, another liquid chromatographic method is used for the determination of the enantiomeric composition of samples. Enantioselective HPLC, as the method is called, can be viewed as a complementary measurement for the characteri2ation of analytes. This is not only true for samples of pharmaceutical origin, for which monitoring of achiral and enantiomeric purity are mandatory [1], but also for agrochemical products, flavors, and fragrances. 

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