Quality of pilsner malt and roasted malt during storage was written by Hoff, Signe;Lund, Marianne N.;Petersen, Mikael A.;Jespersen, Birthe M.;Andersen, Mogens L.. And the article was included in Journal of the Institute of Brewing in 2014.Application In Synthesis of 2,4,5-Trimethyloxazole This article mentions the following:
Malt is usually expected to be stable during 12 mo of storage. However, in practice many brewers notice changes in malt aroma during storage. The oxidative stabilities of pilsner malt and roasted malt were evaluated during a 12 mo storage at different temperatures (10 and 20 °C) and water activities (0.231 and 0.432). The radical content in malt kernels was measured by ESR spectroscopy and the volatile profile of the resulting sweet worts was measured by head-space anal. followed by GC-MS anal. The storage of malt resulted in oxidative reactions and a large change of the volatile profile of the resulting worts. Roasted malt was much more unstable than pilsner malt, as illustrated by a higher initial radical intensity, larger radical decay during storage and a larger change in the volatile profile of the wort with increased amounts of lipid oxidation products. For both roasted malt and pilsner malt, good correlations were found between radical decay and changes in the volatile profile of the wort, where high temperature and high water activity resulted in the largest changes. During the 12 mo of storage, the sugar extract of the wort made from the malts remained constant and was not affected by the chem. changes. This study suggests that chem. changes occurring in malts during less than 12 mo of storage may potentially affect the aroma of beer, and that water activity and storage temperature should both be kept low in order to maintain a high malt quality. Copyright © 2014 The Institute of Brewing & Distilling In the experiment, the researchers used many compounds, for example, 2,4,5-Trimethyloxazole (cas: 20662-84-4Application In Synthesis of 2,4,5-Trimethyloxazole).
2,4,5-Trimethyloxazole (cas: 20662-84-4) belongs to oxazolidine derivatives. Oxazolidines are commonly obtained by reaction of strained heterocycles, mainly aziridines. As well as other multifunctional heterocyclic compounds, oxazolidine rings play an essential role in organic and medicinal chemistry, behaving, in some cases as powerful antitumor agents.Application In Synthesis of 2,4,5-Trimethyloxazole
Referemce:
Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem