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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Rates of Formation of cis- and trans-Oak Lactone from 3-Methyl-4-hydroxyoctanoic Acid
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Rates of Formation of cis- and trans-Oak Lactone from 3-Methyl-4-hydroxyoctanoic Acid

机译：由3-甲基-4-羟基辛酸形成顺式和反式橡木内酯的速率

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The rates of formation of both cis- and trans-oak lactone from the corresponding isomers of 3-methyl-4-hydroxyoctanoic acid have been measured in model wine at room temperature for a range of pH values.The half-life for formation of the trans-isomer at pH 2.9 was calculated to be 3.1 h,whereas that for the cis-isomer,at the same pH,was calculated to be 40.5 h.The k_(trans)/k_(cis) ratio in model wine was found to 12.86+-1.34 over the range of pH values employed.A reason for the more facile formation of the trans-isomer,based on conformational reasons,has been proposed.In acidic aqueous media the equilibrium between the oak lactones and their corresponding ring-opened analogues was found to favor the former entirely,with no evidence for the latter being found.Implications of the present study for the future analysis of oak samples,as well as for the interpretation of existing data,are discussed.
机译：在室温下在一定pH值范围内，已在模型酒中测量了由3-甲基-4-羟基辛酸的相应异构体形成的顺式和反式橡木内酯的形成速率。 pH值为2.9时反式异构体的计算值为3.1 h，而相同pH值下的顺式异构体的反式异构体的计算值为40.5 h。发现模型酒中的k_（trans）/ k_（cis）比为在所使用的pH值范围内为12.86 + -1.34。基于构象原因，提出了更容易形成反式异构体的原因。在酸性水性介质中，橡木内酯及其相应开环之间的平衡发现类似物完全有利于前者，没有证据表明后者。本文讨论了本研究对橡木样品的未来分析以及对现有数据的解释的意义。

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