3 years ago

[ASAP] Characterization of 3-Methylindole as a Source of a “Mud”-like Off-Odor in Strong-Aroma Types of Base Baijiu

[ASAP] Characterization of 3-Methylindole as a Source of a “Mud”-like Off-Odor in Strong-Aroma Types of Base Baijiu
Wei Dong, Ke Shi, Miao Liu, Caihong Shen, Anjun Li, Xiaotao Sun, Mouming Zhao, Jinyuan Sun, Hehe Li, Fuping Zheng, Mingquan Huang
The “mud”-like off-odor, which is an odor reminiscent of musty and strong animal fecal odors, affects the quality classification of the strong-aroma types of baijiu (SAB), but little is known about which compounds are responsible for this aroma, except for certain phenolic compounds. However, not all mud-like off-odor expressions in SAB can be attributed to those phenolic compounds. In this work, volatile compounds in pit mud and SAB samples were isolated by headspace solid-phase microextraction and liquid–liquid extraction. An odoriferous zone was detected by GC–MS/olfactometer and GC–MS and was attributed to 3-methylindole rather than ethyl oleate on the basis of their odor characteristics, MS data, and retention indices. Combined with the detection threshold of 3-methylindole determined by a three-alternative forced-choice (6.09 μg/L) procedure, odor activity values in the tested base SAB were from 1 to 23. Sensory studies and the prepared heat map highlighted the contribution of this compound to the odor characteristics for the first time.

Publisher URL: http://dx.doi.org/10.1021/acs.jafc.8b04734

DOI: 10.1021/acs.jafc.8b04734

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