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231224s2014 xx |||||o 00| ||eng c |
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|a 10.1002/mrc.4129
|2 doi
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|a eng
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|a Monakhova, Yulia B
|e verfasserin
|4 aut
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|a Investigation into the structural composition of hydroalcoholic solutions as basis for the development of multiple suppression pulse sequences for NMR measurement of alcoholic beverages
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|c 2014
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|a Text
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 21.05.2015
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|a Date Revised 24.11.2014
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Copyright © 2014 John Wiley & Sons, Ltd.
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|a An eight-fold suppression pulse sequence was recently developed to improve sensitivity in (1) H NMR measurements of alcoholic beverages [Magn. Res. Chem. 2011 (49): 734-739]. To ensure that only one combined hydroxyl peak from water and ethanol appears in the spectrum, adjustment to a certain range of ethanol concentrations was required. To explain this observation, the structure of water-ethanol solutions was studied. Hydroalcoholic solutions showed extreme behavior at 25% vol, 46% vol, and 83% vol ethanol according to (1) H NMR experiments. Near-infrared spectroscopy confirmed the occurrence of four significant compounds ('individual' ethanol and water structures as well as two water-ethanol complexes of defined composition - 1 : 1 and 1 : 3). The successful multiple suppression can be achieved for every kind of alcoholic beverage with different alcoholic strengths, when the final ethanol concentration is adjusted to a range between 25% vol and 46% vol (e.g. using dilution or pure ethanol addition). In this optimum region, an individual ethanol peak was not detected, because the 'individual' water structure and the 1 : 1 ethanol-water complex predominate. The nature of molecular association in ethanol-water solutions is essential to elucidate NMR method development for measurement of alcoholic beverages. The presented approach can be used to optimize other NMR suppression protocols for binary water-organic solvent mixtures, where hydrogen bonding plays a dominant role
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|a Journal Article
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|a 1H NMR
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|a alcoholic beverages
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|a ethanol
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|a hydrogen bonding
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|a multiple suppression
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|a Mushtakova, Svetlana P
|e verfasserin
|4 aut
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|a Kuballa, Thomas
|e verfasserin
|4 aut
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|a Lachenmeier, Dirk W
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Magnetic resonance in chemistry : MRC
|d 1985
|g 52(2014), 12 vom: 20. Dez., Seite 755-9
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|x 1097-458X
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|g volume:52
|g year:2014
|g number:12
|g day:20
|g month:12
|g pages:755-9
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|u http://dx.doi.org/10.1002/mrc.4129
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