Coupled multidimensional GC and odor activity value calculation to identify off-odors in thermally processed muskmelon juice was written by Pang, Xueli;Zhang, Yizhi;Qiu, Jun;Cao, Jianmin;Sun, Yuqing;Li, Hehe;Kong, Fanyu. And the article was included in Food Chemistry in 2019.Electric Literature of C6H12O2 This article mentions the following:
Predominant contributors to thermally-induced off-notes in muskmelon juice were investigated by combination of sensory evaluation, GC-olfactometry (GC-O), multidimensional GC, odor activity value (OAV) calculation and addition experiments “Fermented” and “sulfurous” were revealed as the dominant heat-induced offensive off-notes, and fundamental heat-led changes in odorant compositions were observed Comparative aroma extract dilution anal. revealed that the off-flavors were mainly caused by newly heat-formed compounds with extremely low odor threshold and unpleasant smells. These included volatile sulfur compounds with “rotten” odors, Strecker aldehydes having “fermented” notes, and heterocyclics exhibiting “roasted” smells. Specifically, di-Me sulfide, methional, methanethiol, di-Me trisulfide, di-Me disulfide, and acetaldehyde were identified as the predominant off-note contributors, among which DMS was the most important one, showing the highest OAV. Multiple extraction techniques, GC-O coupling to GC × GC-QTOF-MS and OAV calculation are powerful tools for accurate location and reliable identification of trace and key off-odorants in natural complex matrixes. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Electric Literature of C6H12O2).
Methyl2-methylbutyrate (cas: 868-57-5) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Electric Literature of C6H12O2
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics