Flavoromics approach in monitoring changes in volatile compounds of virgin rapeseed oil caused by seed roasting was written by Gracka, Anna;Jelen, Henryk H.;Majcher, Malgorzata;Siger, Aleksander;Kaczmarek, Anna. And the article was included in Journal of Chromatography A in 2016.Name: 2,4,5-Trimethyloxazole This article mentions the following:
Two varieties of rapeseed (one high oleic – containing 76% of oleic acid, and the other – containing 62% of oleic acid) were used to produce virgin (pressed) oil. The rapeseeds were roasted at different temperature/time combinations (at 140-180 °C, and for 5-15 min); subsequently, oil was pressed from the roasted seeds. The roasting improved the flavor and contributed to a substantial increase in the amount of a potent antioxidant-canolol. The changes in volatile compounds related to roasting conditions were monitored using comprehensive gas chromatog.-mass spectrometry (GC × GC-ToFMS), and the key odorants for the non-roasted and roasted seeds oils were determined by gas chromatog.-olfactometry (GC-O). The most important compounds determining the flavor of oils obtained from the roasted seeds were di-Me sulfide, dimethyltrisulfide, 2,3-diethyl-5-methylpyrazine, 2,3-butenedione, octanal, 3-isopropyl-2-methoxypyrazine and phenylacetaldehyde. For the oils obtained from the non-roasted seeds, the dominant compounds were dimethylsulfide, hexanal and octanal. Based on GC × GC-ToFMS and principal component anal. (PCA) of the data, several compounds were identified that were associated with roasting at the highest temperatures regardless of the rapeseed variety: these were, among others, Me ketones (2-hexanone, 2-heptanone and 2-octanone). In the experiment, the researchers used many compounds, for example, 2,4,5-Trimethyloxazole (cas: 20662-84-4Name: 2,4,5-Trimethyloxazole).
2,4,5-Trimethyloxazole (cas: 20662-84-4) belongs to oxazolidine derivatives. A common way to produce multisubstituted oxazolidines is by means of cycloaddition reactions. Some reports highlighted again the effectiveness of oxazolidine-based compounds in driving the stereo- or diastereotopic outcome of chemical reactions.Name: 2,4,5-Trimethyloxazole
Referemce:
Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem