3.4. Compositions of volatile compounds in Se-GBR and GBR
To determine compositional variations between Se-GBR and GBR as well as changes as a function of storage time and temperature, over 100 volatile compounds were identified using MassLynx software (untraceable and/or impurity compounds were excluded) from 14 samples extracted with SPME fibers and analyzed by GC–MS (Table 1). The volatile compounds comprised eight classes, namely esters, acids, aldehydes, ketones, hydrocarbons, alcohols, phenols, and heterocycles. Each rice sample included 50–60 volatile compounds, with hydrocarbons as the most abundant category,
followed by alcohols and aldehydes. The relative percentages of these compounds are expressed as a mass fraction of the total peak area of the sample.