Accelerating two-dimensional nuclear magnetic resonance correlation spectroscopy via selective coherence transfer

2017 ◽  
Vol 146 (1) ◽  
pp. 014202 ◽  
Author(s):  
Qimiao Ye ◽  
Lin Chen ◽  
Wenqi Qiu ◽  
Liangjie Lin ◽  
Huijun Sun ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Correlation Spectroscopy ◽  
Two Dimensional ◽  
Coherence Transfer ◽  
Nuclear Magnetic

Quantitative 13C N.M.R. Assay and Assignment of Mixtures from Lipase Digestion of Propane-1,2-diol Dibutyrate

1999 ◽  
Vol 52 (2) ◽  
pp. 123 ◽  
Author(s):  
Charmian J. O'Connor ◽  
Richard H. Barton
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Polarization Transfer ◽  
Correlation Spectroscopy ◽  
Two Dimensional ◽  
13C Nuclear Magnetic Resonance ◽  
Inductive Effects ◽  
Nuclear Magnetic

13C nuclear magnetic resonance (n.m.r.) spectra were obtained at 50 and 100 MHz for mixtures of propanediol, propane-1,2-diol dibutyrate, propane-1,2-diol 1-butyrate and propane-1,2-diol 2-butyrate in CDCl3. Distortionless enhancement by polarization transfer (DEPT) and two-dimensional 13C–1H correlation spectroscopy were used to confirm shift assignments. Spectra for the 1- and 2-monoesters showed strongly different inductive effects due to the position of the butyryl chain. These experiments demonstrate the desirability of using 13C n.m.r. rather than 1H n.m.r. spectroscopy in quantitative speciation of acylated diol complex hydrolysis mixtures.

scholarly journals “One-shot” analysis of wine parameters in non-Saccharomyces large-scale alcohol reduction processes with one- and two-dimensional nuclear magnetic resonance

2019 ◽  
Vol 15 ◽  
pp. 02016
Author(s):  
J.E. Herbert-Pucheta ◽  
C. Pino-Villar ◽  
F. Rodríguez-González ◽  
G. Padilla-Maya ◽  
D. Milmo-Brittingham ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Large Scale ◽  
Correlation Spectroscopy ◽  
Wine Industry ◽  
Proton Nuclear Magnetic Resonance ◽  
Resonance Spectroscopy ◽  
Two Dimensional ◽  
Alcohol Reduction ◽  
Nuclear Magnetic

Facing climate change in wine industry comprises the implementation of strategies, such as to reduce alcohol in wines, promoted by abnormal increment of sugar levels in wine grapes. The present work discusses the first industrial-scale use of specific yeast strains able to produce wine with reduced alcoholic concentration. Reduction of alcohol content and quantification of key metabolites associated to oenological practice and/or quality were simultaneously measured in a “one-shot” way with proton Nuclear Magnetic Resonance Spectroscopy. Novel relevant metabolites were revealed with the use of a two-dimensional 1H-13C HSQC multipresat correlation spectroscopy, whereas a detailed methodological NMR description is stressed, towards revealing novel resonances within the NMR signature. The use of multitask analytical methods to simultaneously describe alcohol reduction and NMR targeting, completes the portfolio of NMR solutions recently proposed to the World Organisation of Vine and Wine for as well quantify aging and varieties.

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