Complete1H and13C NMR assignment and31P NMR determination of pentacyclic triterpenic acids

2017 ◽  
Vol 9 (6) ◽  
pp. 949-957 ◽  
Author(s):  
Photis Dais ◽  
Rebecca Plessel ◽  
Kathryn Williamson ◽  
Emmanuel Hatzakis
Keyword(s):  
Nmr Spectroscopy ◽  
High Resolution ◽  
Nmr Assignment ◽  
Multidimensional Nmr ◽  
Multidimensional Nmr Spectroscopy ◽  
Triterpenic Acids ◽  
C Nmr

In this study we report the complete and unambiguous1H and13C NMR assignment of betulinic, maslinic, oleanolic and ursolic acids by utilizing high-resolution multidimensional NMR spectroscopy.

Analysis of marine dietary supplements using NMR spectroscopy

2015 ◽  
Vol 7 (12) ◽  
pp. 5226-5238 ◽  
Author(s):  
Photis Dais ◽  
Maria Misiak ◽  
Emmanuel Hatzakis
Keyword(s):  
Quantitative Analysis ◽  
Nmr Spectroscopy ◽  
High Resolution ◽  
Fish Oil ◽  
Dietary Supplements ◽  
Multidimensional Nmr ◽  
Qualitative And Quantitative Analysis ◽  
Qualitative And Quantitative ◽  
Multidimensional Nmr Spectroscopy

The objective of this study is the qualitative and quantitative analysis of encapsulated fish oil supplements by utilizing high-resolution multinuclear (1H,13C,31P) and multidimensional NMR spectroscopy.

scholarly journals Secondary structure determination of 15 N-labelled human Long-[Arg-3]-insulin-like growth factor 1 by multidimensional NMR spectroscopy

FEBS Letters ◽  
1997 ◽  
Vol 420 (1) ◽  
pp. 97-102 ◽  
Author(s):  
Leanne G Laajoki ◽  
Eugene Le Breton ◽  
Gary K Shooter ◽  
John C Wallace ◽  
Geoffrey L Francis ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Growth Factor ◽  
Secondary Structure ◽  
Structure Determination ◽  
Multidimensional Nmr ◽  
Insulin Like Growth Factor ◽  
Multidimensional Nmr Spectroscopy

Removal of a time barrier for high-resolution multidimensional NMR spectroscopy

2006 ◽  
Vol 3 (8) ◽  
pp. 605-607 ◽  
Author(s):  
Victor Jaravine ◽  
Ilgis Ibraghimov ◽  
Vladislav Yu Orekhov
Keyword(s):  
Nmr Spectroscopy ◽  
High Resolution ◽  
Multidimensional Nmr ◽  
Multidimensional Nmr Spectroscopy

Determination of Tautomeric Preference of Fenobam in Solution by High Resolution NMR Spectroscopy

2020 ◽  
Author(s):  
Xuming Sha ◽  
Shaodong Chen ◽  
Xiaojing Zheng ◽  
Xin Ye ◽  
Hailu Zhang ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
High Resolution ◽  
High Resolution Nmr

Fast Multidimensional NMR Spectroscopy Using Compressed Sensing

2011 ◽  
Vol 50 (29) ◽  
pp. 6548-6551 ◽  
Author(s):  
Daniel J. Holland ◽  
Mark J. Bostock ◽  
Lynn F. Gladden ◽  
Daniel Nietlispach
Keyword(s):  
Nmr Spectroscopy ◽  
Compressed Sensing ◽  
Multidimensional Nmr ◽  
Multidimensional Nmr Spectroscopy ◽  
Fast Multidimensional Nmr

A Novel Method for 13C-NMR Spectroscopy of Polymer in Emulsion: Quantitative Analysis of Microstructure of Crosslinked Polybutadiene in Latex

1999 ◽  
Vol 72 (5) ◽  
pp. 844-853 ◽  
Author(s):  
Seiichi Kawahara ◽  
Saori Bushimata ◽  
Takashi Sugiyama ◽  
Chihiro Hashimoto ◽  
Yasuyuki Tanaka
Keyword(s):  
Nmr Spectroscopy ◽  
High Resolution ◽  
13C Nmr ◽  
Lattice Relaxation ◽  
13C Nmr Spectroscopy ◽  
Lattice Relaxation Time ◽  
Solid Sample ◽  
Spin Lattice Relaxation ◽  
High Resolution Spectrum ◽  
C Nmr

Abstract A novel analytical method using high resolution 13C-NMR spectroscopy to study polymer latex, which is a heterogeneous system comprising polymer dispersoid and water, is described. The appropriate concentrations of surfactant and dried rubber content of a polybutadiene latex, which give the best spectrum, were found to be 1 w/v % and 10%, respectively. The half-widths of resonance peaks for the latex sample were almost identical to the half-widths obtained in solution, which were about one-third the width of those obtained using a solid sample of either a crosslinked or soluble polybutadiene. Nevertheless, the signal to noise ratio for the latex sample was slightly smaller than that for the solution sample. The values of spin-lattice relaxation time, T1, for the latex sample were similar to those for the solid sample. These demonstrate that the latex state C-NMR spectroscopy will be a powerful technique for structural characterization of crosslinked gels in the dispersoid because it gives a high resolution spectrum comparable to solution state spectroscopy, showing short T1 values corresponding to those for solid state C-NMR spectroscopy. High resolution latex state 13C-NMR spectroscopy was used to determine the concentrations of the various isomers of the polybutadiene in the dispersoid.

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