Quantitative and structure analysis of pectin in tobacco by13C CP/MAS NMR spectroscopy

2014 ◽  
Vol 6 (16) ◽  
pp. 6407-6413 ◽  
Author(s):  
Xiaolan Zhu ◽  
Baizhan Liu ◽  
Saijing Zheng ◽  
Yun Gao
Keyword(s):  
Nmr Spectroscopy ◽  
Structure Analysis ◽  
Nmr Spectra ◽  
Mas Nmr ◽  
New Method ◽  
Optimal Conditions ◽  
Cp Mas Nmr

A new method utilizing13C CP/MAS NMR spectra was developed for the simultaneous quantitative and structure analysis of pectin in tobacco. The method was employed to measure pectin after the extraction of tobacco samples with acid under optimal conditions (pH 2.0 for 1.5 h at 85 °C).

Suspension NMR Spectroscopy of Phosphines and Carbonylnickel Complexes Immobilized on Silica

1995 ◽  
Vol 50 (11) ◽  
pp. 1723-1728 ◽  
Author(s):  
K. D. Behringer ◽  
J. Bliimel
Keyword(s):  
Nmr Spectroscopy ◽  
High Resolution ◽  
Nmr Spectra ◽  
Solvent Polarity ◽  
Mas Nmr ◽  
Solvent Viscosity ◽  
Alkyl Chains ◽  
High Resolution Nmr ◽  
Cp Mas Nmr ◽  
Nmr Signals

The 31P suspension NMR spectra o f silica-immobilized bifunctional phosphines and their di- and tricarbonylnickel complexes were recorded using conventional high resolution NMR equipment. The practical advantages of suspension NMR spectroscopy, as compared to 31P CP/MAS NMR spectroscopy, are discussed. General tendencies are demonstrated: The suspension NMR signals become broader with increasing solvent viscosity and decreasing solvent polarity. Phenyl groups as spacers lead to broader resonances than alkyl chains. The linewidths increase in the case of chelation.

Hydration effects in the carbon-13 CP/MAS NMR spectra of solid (1 →3)-β-D-glucans

1984 ◽  
Vol 17 (3) ◽  
pp. 501-502 ◽  
Author(s):  
C. A. Fyfe ◽  
P. J. Stephenson ◽  
M. G. Taylor ◽  
T. L. Bluhm ◽  
Y. Deslandes ◽  
...  
Keyword(s):  
Nmr Spectra ◽  
Mas Nmr ◽  
Cp Mas Nmr

scholarly journals Quantification of acidic sites of nanoscopic hydroxylated magnesium fluorides by FTIR and 15N MAS NMR spectroscopy

RSC Advances ◽  
2015 ◽  
Vol 5 (109) ◽  
pp. 89659-89668 ◽  
Author(s):  
Felix Hemmann ◽  
Iker Agirrezabal-Telleria ◽  
Christian Jaeger ◽  
Erhard Kemnitz
Keyword(s):  
Nmr Spectroscopy ◽  
Mas Nmr ◽  
New Method ◽  
Extinction Coefficients ◽  
Surface Sites ◽  
Acidic Sites ◽  
Molar Extinction Coefficients

A new method is described for the calculation of molar extinction coefficients for quantitative FTIR measurements of acidic surface sites.

Interaction of Gold with Co-Condensed and Grafted HMS-SH Silica: A 29Si {1H} CP-MAS NMR Spectroscopy, XRD, XPS and Au LIII EXAFS Study

2010 ◽  
Vol 2010 (23) ◽  
pp. 3628-3635 ◽  
Author(s):  
Valeria La Parola ◽  
Alessandro Longo ◽  
Anna Maria Venezia ◽  
Alberto Spinella ◽  
Eugenio Caponetti
Keyword(s):  
Nmr Spectroscopy ◽  
Mas Nmr ◽  
Exafs Study ◽  
Cp Mas Nmr

Ultrafast high-resolution magic-angle-spinning NMR spectroscopy

The Analyst ◽  
2015 ◽  
Vol 140 (12) ◽  
pp. 3942-3946 ◽  
Author(s):  
Marion André ◽  
Martial Piotto ◽  
Stefano Caldarelli ◽  
Jean-Nicolas Dumez
Keyword(s):  
Nmr Spectroscopy ◽  
High Resolution ◽  
Nmr Spectra ◽  
Magic Angle Spinning ◽  
Mas Nmr ◽  
Magic Angle ◽  
Solid Samples ◽  
Semi Solid ◽  
Angle Spinning

The acquisition of ultrafast high-resolution magic-angle spinning (HR-MAS) NMR spectra of semi-solid samples is demonstrated.

Carbon-13 CP/MAS NMR spectroscopy of magnesium-anthracene and -cyclooctatetraene complexes: graphite-assisted degradation of a magnesium-anthracene complex

1991 ◽  
Vol 10 (7) ◽  
pp. 2098-2100 ◽  
Author(s):  
William M. Brooks ◽  
Colin L. Raston ◽  
Rodney E. Sue ◽  
Frank J. Lincoln ◽  
Justin J. McGinnity
Keyword(s):  
Nmr Spectroscopy ◽  
Mas Nmr ◽  
Cp Mas Nmr
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