Odor description

Component CAS Registry Number Stmcture number Odor description... 

The low odor threshold (0.1 pg/kg water) of this compound and its odor description as "popcorn-like" (27) agrees with its strong crusty character. Furthermore, the statement of Buttery et al. (27) that "2-acetyl-l-pyrroline seems to be the most potent of the cracker-like group of odor compounds" (which includes 3, 5 and 7 in Figure 1) underlines its importance for the flavor of the white bread crust. 

Figure 3. Odor description of some mercapto furan...

Numerous substances have the same odor. Table 13-1 shows examples of the odor descriptions musty , painty and plastic which are used for a number of different substances. It is therefore obvious that for example the description musty of an off-flavor does not give any concrete reference to the kind of the off-odor substance involved. 

The description of the off-odor, identified at the beginning of the study in the global sensorial evaluation, which has been separated into several components by the gas chromatographic sniffing method can have seemingly large deviations in the descriptions of the individual components from the initial off-odor description. 

Fig. 8E.1 Scheme showing the basics of AEDA and Charm analysis. Different sequential dilutions of the sample extract are analyzed in the GC-O system. In AEDA the judge simply marks the retention times and the odor descriptions. The FD value is R , where p is the p-th dilution of the extract at which the odor was last detected and R is the dilution rate (3 in the figure). In Charm, he/she presses the space bar of the computer during the odor detection, and the outputs are combined to form the Charm chromatogram... 

Odor" Faintly fruity no odor when pure Odorless when pure Fruity, odor of camphor when impure Perceptible fruity no agreement on odor description odorless when pure Odorless when pure NA Odorless... 

Odor description Pleasant, like newly mown hay Dunlap (2001)... 

Table III. Odor Description of Alkyloxazoles Identified in Fried Bacon Flavor...

Odor descriptions of dilute water solutions of P-damascenone and 1-nitro-2-phenylethane were also obtained using a panel of 18-20 judges. p-Damascenone as a 10 ppb solution in water was described as having an odor most similar to (1) prunes (2) apple (3) sweet character and (4) tomato in that order (i.e. being most like prunes). The odor of 1 ppm solutions of 1-nitro-2-phenylethane were described as (1) green (2) geranium (3) tomato and (4) oily in that order. 

Table IV. Odor Descriptions and Odor Units for Selected ...

Constituent Odor Units Odor Description (Fenaroi(5))... 

Compound Flavor Dilution (FD) Factor Odor Description... 

Odor description at a higher concentration (about 1 mg/L). Detection threshold in water (pg/L) was obtained by orthonasal measurements performed by 7 panelists. 

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