Investigations on the impact of the special flavor hop variety Huell Melon on the odor-active compounds in late hopped and dry hopped beers was written by Neiens, Silva D.;Steinhaus, Martin. And the article was included in Journal of Agricultural and Food Chemistry in 2019.Category: esters-buliding-blocks This article mentions the following:
Bottom-fermented and top-fermented beers, both either late or dry hopped with Huell Melon hops, and resp. reference beers without late or dry hopping were subjected to a comparative odorant screening by aroma extract dilution analyses. On the basis of differences in the FD factors, 14 odorants were identified as hop-derived. Among them were Et 2-methylpropanoate, Me 2-methylbutanoate, Et 2-methylbutanoate, Pr 2-methylbutanoate, myrcene, linalool, and geraniol. Differences between late hopped, dry hopped, and reference beers were substantiated by quantitation. Results showed minimal transfer of myrcene from hops into beer. Moderate transfer was observed for Pr 2-methylbutanoate, geraniol, and linalool. Process-induced changes of Et 2-methylpropanoate, Et 2-methylbutanoate, and Me 2-methylbutanoate were beyond a direct transfer from hops into beer, suggesting a formation from the corresponding hop-derived carboxylic acids by yeast. Spiking experiments revealed that linalool and Pr 2-methylbutanoate contributed particularly to the characteristic aroma of beers flavored with Huell Melon hops. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Category: esters-buliding-blocks).
Methyl2-methylbutyrate (cas: 868-57-5) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Category: esters-buliding-blocks
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics