Methyl thiobutanoate

The supply of MT may be rate-limiting in K. lactis. In addition to S-methyl thioacetate, G. candidum also contains S-methyl thiopropionate, S-methyl thiobutanoate, S-methyl thiowobutanoate, S-methyl thiowovalerate, and S-methyl thiohexanoate in smaller amounts.42... 

To assess the relative sensory significance of the esters and the sulfur volatiles to the overall melon aroma, the SDE extract was analyzed by aroma extraction dilution analysis (AEDA) using gas chromatography-olfactometry (GCO). The FID and sensory responses to the most dilute extract are shown in Figure 2, and the complete AEDA data is summarized in Table II. Of the seven peaks identified as significant odorants at the highest dilution, four contain sulfur, S-methyl thiobutanoate, 3-(methylthio)propanal, 3-(methylthio)propyl acetate and. 

Sulfur volatiles play a significant role in the perceived aroma of Cucumis melo cv. Makdimon. In particular 3-(methylthio)propanal and S-methyl thiobutanoate and dimethyltetrasulfide (tentative) convey a musky overtone to the classical fruity aromas associated with 3-(methylthio)propyl acetate, ethyl 2-methylpropanoate, ethyl 2-methylbutanoate and methyl 2-methylbutanoate. Further work is required to confirm the contribution of the enantiomers of 2,3-butanediol diacetate and the unknown compound that conveys the sweaty, dirty socks component to the aroma of this melon. 

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