Determination of highly volatile compounds in fresh onion (Allium cepa L.) by room-temperature enrichment headspace-trap coupled to cryotrapping GC-MS was written by Liu, Mengpan;Su, Yue;Guo, Yinlong. And the article was included in Separation Science plus in 2018.Safety of 2,5-Dimethylthiophene The following contents are mentioned in the article:
Conventional headspace-based anal. is not suitable for identifying volatile compounds in fresh onion (Allium cepa L.) because large amounts of water vapor could affect the determination of target compounds A headspace-trap was introduced to remove water vapor and keep the analytes in the trap tube. Addnl., the headspace-trap method based on room-temperature enrichment could prevent enzyme-sensitive samples from denaturing to maintain the original flavor compositions of the samples. Moreover, the highly volatile compounds were poorly separated after headspace extraction By using a cryotrapping device, these compounds were well separated Therefore, a room-temperature enrichment headspace-trap cryotrapping gas chromatog. with mass spectrometric method was established for the determination of volatile compounds in fresh onion. With this method, a total of 73 volatile compounds were identified by mass spectral search and retention index. Among them, 29 highly volatile compounds were successfully separated before the retention time of 5 min, and these compounds contributed significantly to the smell of onion. The volatile compounds were dominated by di-Pr disulfide (35.42%), 1,2-dithiolane (15.82%), 1-propanethiol (11.74%) and propanal (11.23%). The results indicated that the proposed method was an effective tool for analyzing volatile compounds in high-water-content fresh onion samples. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Safety of 2,5-Dimethylthiophene).
2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophenes are valuable heterocycles that are widely used in medicines, agrochemicals, and materials science. It is also used in the manufacturing of dyes such as thioindigo.Safety of 2,5-Dimethylthiophene
Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem