Figure 1 shows the chromatogram from the electronic nose which is in the form of a graphical display of the derivative of the frequency change versus time. The electronic nose does not resolve the sample’s volatiles into its individual components, but responds to a whole set of volatiles in a unique digital pattern [23]. Table 2 shows the set of volatile compounds corresponding to peaks 1–13 and their odor descriptions. The identification of these peaks was tentatively based on a database of Kovats retention indices stored in the substance library of the Microsense software using n-alkanes as the standard [17]. Kovats retention indices are retention, relative to those n-alkanes, which is useful for the identification of compounds by chromatography techniques [24, 25]. Some of the volatile compounds found in this study, such as methyl tetradecanoate and methyl trans-9-octadecanoate, were also identified in our previous study [22].