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• W2511423535 endingPage "6878" @default.
• W2511423535 startingPage "6869" @default.
• W2511423535 abstract "As wine oxidizes, ethanol is converted to acetaldehyde, but its accumulation is not predictable, due to poorly characterized reactions with alcohols, SO2, thiols, flavanols, and others. Measurement of these components has been thwarted by equilibria into the other forms during sample preparation. NMR spectra can be taken on intact samples and is thus ideal for this situation. Equilibria of acetaldehyde with glycerol, (+)-catechin, and glutathione were studied separately in model wine solutions at pH 3-4 by (1)H NMR and 2D ((1)H-(1)H) COSY spectra. Glycerol acetals had equilibrium constants between 1.14 ± 0.056 and 2.53 ± 0.043 M(-1), whereas ethylidene-bridged (+)-catechin dimers and glutathione thiohemiacetals had more favorable equilibria: from (3.92 ± 0.13) × 10(3) to (6.13 ± 0.32) × 10(3) M(-2) and from 10.18 ± 0.22 to 11.17 ± 0.47 M(-1), respectively. These data can be used to create accurate measures of acetaldehyde in its various forms and, consequently, offer insight into wine oxidation." @default.
• W2511423535 created "2016-09-16" @default.
• W2511423535 creator A5026910831 @default.
• W2511423535 creator A5084009070 @default.
• W2511423535 date "2016-08-31" @default.
• W2511423535 modified "2023-10-16" @default.
• W2511423535 title "¹H NMR: A Novel Approach To Determining the Thermodynamic Properties of Acetaldehyde Condensation Reactions with Glycerol, (+)-Catechin, and Glutathione in Model Wine" @default.
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• W2511423535 doi "https://doi.org/10.1021/acs.jafc.6b02077" @default.
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• W2511423535 hasPublicationYear "2016" @default.
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