Characterization of 3-Methylindole as a Source of a "Mud"-like Off-Odor in Strong-Aroma Types of Base Baijiu
Characterization of 3-Methylindole as a Source of a "Mud"-like Off-Odor in Strong-Aroma Types of Base Baijiu
复制标题
3-甲基吲哚作为浓香基白酒中“泥”样异味来源的表征
DOI：
10.1021/acs.jafc.8b04734
复制
发表时间：
2018-12-05
影响因子：
6.1
通讯作者：
Huang, Mingquan
中科院分区：
文献类型：
--
作者：
Dong, Wei;Shi, Ke;Huang, Mingquan
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 mu g/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.
