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首页> 外文期刊>Journal of the American Society of Brewing Chemists >Differences in the UV-Spectra of the Hop-Derived cis- and trans-Iso-α-Acids
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Differences in the UV-Spectra of the Hop-Derived cis- and trans-Iso-α-Acids

机译:蛇麻草衍生的顺式和反式-α-酸的紫外光谱差异

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摘要

The cis- and trans-iso-α-acids are known to have different UV-absorption spectra. This has implications for the analytical quantification of these compounds (for bitterness control and commercial transaction of isomerized products) because these analyses are very often based on UV-absorption. Here, these differences are rationalized on the basis of differences in the tautomeric ratios of the cis- and trans-iso-α-acids, with these ratios being determined by application of ab initio computational chemistry techniques. While there is a significant amount of computational time required to complete the calculations, this approach makes this complex example of tautomerism amenable to detailed study.
机译:已知顺式和反式-异α-酸具有不同的紫外线吸收光谱。这对这些化合物的分析定量(用于控制苦味和异构化产品的商业交易)具有影响,因为这些分析通常是基于紫外线吸收的。在此,基于顺式和反式-α-酸的互变异构体比率的差异来合理化这些差异,这些比率是通过从头算化学化学技术的应用来确定的。尽管需要大量的计算时间才能完成计算,但这种方法使互变异构这一复杂的例子值得详细研究。

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