Sensient Flavors & Extracts, North America, 5115 Sedge Blvd, Hoffman Estates, IL 60192, USA.
Department of Food Science and Human Nutrition, University of Illinois, 1302 W. Pennsylvania Avenue, Urbana, IL 61801, USA.
Molecules. 2021 Jul 20;26(14):4368. doi: 10.3390/molecules26144368.
Experiments were conducted to identify a compound responsible for a , , odor note in oak-aged spirits. The target compound was extracted from oak wood and various oak-aged spirits and analyzed by multidimensional (heart-cut) gas chromatography-mass spectrometry-olfactometry (MD-GC-MS-O), and was unambiguously identified as the sesquiterpene ketone, 5-isopropenyl-3,8-dimethyl-3,4,5,6,7,8-hexadydro-1()-azulenone (rotundone). Quantitation of the trace-level target compound was done by stable isotope dilution analysis (SIDA) in a variety of oak-aged spirits, including bourbon, rye, Tennessee whiskey, scotch, rum, and tequila. The content of rotundone was found to increase as a function of years of barrel aging for 4-, 8-, and 12-year-old bourbons obtained from the same manufacturer, thus confirming its origin to be from oak. In addition, odor-activity values (OAVs) were compared for selected potent odorants, including rotundone, in the same 4-, 8-, and 12-year-old bourbons, which indicated the relative importance of rotundone in the overall flavor of oak-aged spirits.
进行了实验以鉴定一种化合物，该化合物负责橡木陈酿烈酒中的一种 、 、 气味特征。目标化合物从橡木和各种橡木陈酿烈酒中提取出来，通过多维（心切割）气相色谱-质谱-嗅闻法（MD-GC-MS-O）进行分析，并明确鉴定为倍半萜酮，5-异丙烯基-3,8-二甲基-3,4,5,6,7,8-六氢-1()-薁酮（轮烯酮）。在各种橡木陈酿烈酒中，包括波本威士忌、黑麦威士忌、田纳西威士忌、苏格兰威士忌、朗姆酒和龙舌兰酒，通过稳定同位素稀释分析（SIDA）定量测定痕量目标化合物。发现轮烯酮的含量随桶陈酿年数的增加而增加，来自同一制造商的 4 年、8 年和 12 年的波本威士忌就是如此，因此证实其来源是橡木。此外，对选定的强气味剂，包括轮烯酮，在相同的 4 年、8 年和 12 年的波本威士忌中的气味活性值（OAV）进行了比较，这表明轮烯酮在橡木陈酿烈酒整体风味中的相对重要性。
