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.

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).

scholarly journals Sampling Method Affects HR-MAS NMR Spectra of Healthy Caprine Brain Biopsies

Metabolites ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 38
Author(s):  
Annakatrin Häni ◽  
Gaëlle Diserens ◽  
Anna Oevermann ◽  
Peter Vermathen ◽  
Christina Precht
Keyword(s):  
Nmr Spectroscopy ◽  
Sampling Method ◽  
Magic Angle Spinning ◽  
Mas Nmr ◽  
Magic Angle ◽  
1H Nuclear Magnetic Resonance ◽  
Rapid Changes ◽  
Tissue Degradation ◽  
Angle Spinning

The metabolic profiling of tissue biopsies using high-resolution–magic angle spinning (HR-MAS) 1H nuclear magnetic resonance (NMR) spectroscopy may be influenced by experimental factors such as the sampling method. Therefore, we compared the effects of two different sampling methods on the metabolome of brain tissue obtained from the brainstem and thalamus of healthy goats by 1H HR-MAS NMR spectroscopy—in vivo-harvested biopsy by a minimally invasive stereotactic approach compared with postmortem-harvested sample by dissection with a scalpel. Lactate and creatine were elevated, and choline-containing compounds were altered in the postmortem compared to the in vivo-harvested samples, demonstrating rapid changes most likely due to sample ischemia. In addition, in the brainstem samples acetate and inositols, and in the thalamus samples ƴ-aminobutyric acid, were relatively increased postmortem, demonstrating regional differences in tissue degradation. In conclusion, in vivo-harvested brain biopsies show different metabolic alterations compared to postmortem-harvested samples, reflecting less tissue degradation. Sampling method and brain region should be taken into account in the analysis of metabolic profiles. To be as close as possible to the actual situation in the living individual, it is desirable to use brain samples obtained by stereotactic biopsy whenever possible.

Surface Species Formed during Aniline Methylation on Zeolite H–Y Investigated by in Situ MAS NMR Spectroscopy

2001 ◽  
Vol 203 (2) ◽  
pp. 375-381 ◽  
Author(s):  
Irina I Ivanova ◽  
Elena B Pomakhina ◽  
Alexander I Rebrov ◽  
Michael Hunger ◽  
Yuryi G Kolyagin ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Mas Nmr ◽  
Surface Species

Investigating Sorption on Iron−Oxyhydroxide Soil Minerals by Solid-State NMR Spectroscopy:  A6Li MAS NMR Study of Adsorption and Absorption on Goethite

2005 ◽  
Vol 109 (39) ◽  
pp. 18310-18315 ◽  
Author(s):  
Ulla Gro Nielsen ◽  
Younkee Paik ◽  
Keinia Julmis ◽  
Martin A. A. Schoonen ◽  
Richard J. Reeder ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Solid State Nmr ◽  
Mas Nmr ◽  
Iron Oxyhydroxide ◽  
Soil Minerals ◽  
Solid State Nmr Spectroscopy ◽  
Nmr Study

Rotor-Encoded Heteronuclear MQ MAS NMR Spectroscopy of Half-Integer Quadrupolar and Spin I=1/2 Nuclei

2002 ◽  
Vol 154 (1) ◽  
pp. 101-129 ◽  
Author(s):  
Adonis Lupulescu ◽  
Steven P. Brown ◽  
Hans Wolfgang Spiess
Keyword(s):  
Nmr Spectroscopy ◽  
Mas Nmr ◽  
Half Integer

Paramagnetic Hexacyanometalates. The Diversity of Spin Distribution Studied by13C and15N MAS NMR Spectroscopy

2013 ◽  
Vol 52 (21) ◽  
pp. 12634-12644 ◽  
Author(s):  
Natalia Baumgärtel ◽  
Alexandrine Flambard ◽  
Frank H. Köhler ◽  
Rodrigue Lescouëzec
Keyword(s):  
Nmr Spectroscopy ◽  
Mas Nmr ◽  
Spin Distribution

ASSOCIATION OF CERIC IONS WITH SULPHATE (A SPECTRAL STUDY)

1951 ◽  
Vol 29 (10) ◽  
pp. 828-837 ◽  
Author(s):  
T. J. Hardwick ◽  
E. Robertson
Keyword(s):  
Spectral Study ◽  
Association Constants ◽  
Extinction Coefficients ◽  
Ceric Ion ◽  
Molar Extinction Coefficients

Ceric ion has been shown to associate with sulphate ion to form successively Ce(SO4++, Ce(SO4)2, and Ce(SO4)3−. The association constants relating these species have been determined at 25 °C. The molar extinction coefficients of each associated complex have been found between 395 and 430 mμ. Migration experiments bear out the results qualitatively.

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