Krause Franziska, Steinhaus Martin
Technical University of Munich, TUM School of Natural Sciences, Department of Chemistry, Technical University of Munich, Lichtenbergstraße 4, Garching 85748, Germany.
Leibniz Institute for Food Systems Biology at the Technical University of Munich (Leibniz-LSB@TUM), Lise-Meitner-Straße 34, Freising 85354, Germany.
J Agric Food Chem. 2025 Aug 6;73(31):19663-19669. doi: 10.1021/acs.jafc.5c06046. Epub 2025 Jul 25.
Among the off-flavors occasionally found in fermented cocoa, a smoky taint is common. While major contributors to the off-flavor are already known, their source has not been fully clarified: wood smoke contact during drying and overfermentation are currently discussed. Odorant screening by gas chromatography-olfactometry and aroma extract dilution analysis applied to a cocoa sample smoked in a worst-case scenario confirmed 2-methoxyphenol, 3- and 4-methylphenol, 3- and 4-ethylphenol, and 3-propylphenol as important smoky odorants and additionally suggested 2,6-dimethoxyphenol as a potential off-flavor compound. Quantitation and odor activity value calculation of the compounds in fermented cocoa with authentic wood smoke contact in the origin revealed 2-methoxyphenol, 4-methylphenol, and 3-ethylphenol as the most potent smoky odorants. Their distribution between nibs and husks showed considerable diffusion into the nibs; thus, husk removal during further processing cannot guarantee a substantial reduction of the smoky compounds.
在发酵可可中偶尔发现的异味中,烟熏味很常见。虽然这种异味的主要成因已为人所知,但其来源尚未完全阐明:目前正在讨论干燥过程中与木烟接触以及过度发酵的问题。通过气相色谱 - 嗅觉测量法和香气提取物稀释分析对在最坏情况下烟熏的可可样品进行气味物质筛选,证实了2 - 甲氧基苯酚、3 - 甲基苯酚和4 - 甲基苯酚、3 - 乙基苯酚和4 - 乙基苯酚以及3 - 丙基苯酚是重要的烟熏气味物质,此外还表明2,6 - 二甲氧基苯酚是一种潜在的异味化合物。对原产于有真实木烟接触环境下的发酵可可中的这些化合物进行定量和气味活性值计算,结果显示2 -甲氧基苯酚、4 - 甲基苯酚和3 - 乙基苯酚是最具效力的烟熏气味物质。它们在可可豆仁和豆壳之间的分布表明,其大量扩散到了可可豆仁中;因此,在进一步加工过程中去除豆壳并不能保证大幅减少烟熏化合物。
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