Journal of magnetic resonance (San Diego, Calif. : 1997) (2013). Pages: 16-31. Manoj Nimbalkar, Burkhard Luy, Thomas E Skinner, Jorge L Neves, Naum I Gershenzon, Kyryl Kobzar, Wolfgang Bermel, Steffen J Glaser et al.
We present highly robust, optimal control-based shaped pulses designed to replace all 90° and 180° hard pulses in a given pulse sequence for improved performance. Special attention was devoted to ensuring that the pulses can be simply substituted in a one-to-one fashion for the original hard pulses without any additional modification of the existing sequence. The set of four pulses for each nucleus therefore consists of 90° and 180° point-to-point (PP) and universal rotation (UR) pulses of identical duration. These 1ms pulses provide uniform performance over resonance offsets of 20kHz ((1)H) and 35kHz ((13)C) and tolerate reasonably large radio frequency (RF) inhomogeneity/miscalibration of ±15% ((1)H) and ±10% ((13)C), making them especially suitable for NMR of small-to-medium-sized molecules (for which relaxation effects during the pulse are negligible) at an accessible and widely utilized spectrometer field strength of 600MHz. The experimental performance of conventional hard-pulse sequences is shown to be greatly improved by incorporating the new pulses, each set referred to as the Fantastic Four (Fanta4).
[NMR paper] Qualitative and quantitative control of carbonated cola beverages using (1)h NMR spectroscopy.
From Mendeley Biomolecular NMR group:
Qualitative and quantitative control of carbonated cola beverages using (1)h NMR spectroscopy.
Journal of agricultural and food chemistry (2012). Volume: 60, Issue: 11. Pages: 2778-84. Pauline Maes, Yulia B Monakhova, Thomas Kuballa, Helmut Reusch, Dirk W Lachenmeier et al.
(1)H Nuclear magnetic resonance (NMR) spectroscopy (400 MHz) was used in the context of food surveillance to develop a reliable analytical tool to differentiate brands of cola beverages and to quantify selected constituents of the soft drinks. The preparation of the samples...
nmrlearner
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01-09-2013 04:20 PM
[NMR paper] Qualitative and quantitative control of carbonated cola beverages using (1)h NMR spectroscopy.
From Mendeley Biomolecular NMR group:
Qualitative and quantitative control of carbonated cola beverages using (1)h NMR spectroscopy.
Journal of agricultural and food chemistry (2012). Volume: 60, Issue: 11. Pages: 2778-84. Pauline Maes, Yulia B Monakhova, Thomas Kuballa, Helmut Reusch, Dirk W Lachenmeier et al.
(1)H Nuclear magnetic resonance (NMR) spectroscopy (400 MHz) was used in the context of food surveillance to develop a reliable analytical tool to differentiate brands of cola beverages and to quantify selected constituents of the soft drinks. The preparation of the samples...
nmrlearner
Journal club
0
10-19-2012 10:22 AM
[NMR paper] Qualitative and quantitative control of carbonated cola beverages using (1)h NMR spectroscopy.
From Mendeley Biomolecular NMR group:
Qualitative and quantitative control of carbonated cola beverages using (1)h NMR spectroscopy.
Journal of agricultural and food chemistry (2012). Volume: 60, Issue: 11. Pages: 2778-84. Pauline Maes, Yulia B Monakhova, Thomas Kuballa, Helmut Reusch, Dirk W Lachenmeier et al.
(1)H Nuclear magnetic resonance (NMR) spectroscopy (400 MHz) was used in the context of food surveillance to develop a reliable analytical tool to differentiate brands of cola beverages and to quantify selected constituents of the soft drinks. The preparation of the samples...
nmrlearner
Journal club
0
10-12-2012 09:58 AM
[NMR paper] Qualitative and quantitative control of carbonated cola beverages using (1)h NMR spectroscopy.
From Mendeley Biomolecular NMR group:
Qualitative and quantitative control of carbonated cola beverages using (1)h NMR spectroscopy.
Journal of agricultural and food chemistry (2012). Volume: 60, Issue: 11. Pages: 2778-84. Pauline Maes, Yulia B Monakhova, Thomas Kuballa, Helmut Reusch, Dirk W Lachenmeier et al.
(1)H Nuclear magnetic resonance (NMR) spectroscopy (400 MHz) was used in the context of food surveillance to develop a reliable analytical tool to differentiate brands of cola beverages and to quantify selected constituents of the soft drinks. The preparation of the samples...
nmrlearner
Journal club
0
08-24-2012 08:01 PM
[NMR paper] Holistic Control of Herbal Teas and Tinctures Based on Sage (Salvia officinalis L.) for Compounds with Beneficial and Adverse Effects using NMR Spectroscopy.
From Mendeley Biomolecular NMR group:
Holistic Control of Herbal Teas and Tinctures Based on Sage (Salvia officinalis L.) for Compounds with Beneficial and Adverse Effects using NMR Spectroscopy.
Analytical chemistry insights (2012). Pages: 1-12. Stephan G Walch, Dirk W Lachenmeier, Thomas Kuballa, Wolf Stühlinger, Yulia B Monakhova et al.
A methodology that utilizes (1)H-NMR spectroscopy has been developed to simultaneously analyze toxic terpenes (thujone and camphor), major polyphenolic compounds, the total antioxidant capacity (ORAC) and the Folin-Ciocalteu (FC) index in foods...
nmrlearner
Journal club
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08-24-2012 08:01 PM
[U. of Ottawa NMR Facility Blog] FT NMR Spectra Without Pulses
FT NMR Spectra Without Pulses
An FT NMR spectrum is obtained by applying a pulse at the Larmor frequency to a sample in a magnetic field. The precession of the spins induces a voltage in the receiver coil which is recorded as a function of time. The Fourier transform of the time dependent signal is the NMR spectrum. What happens if you do not provide any pulses? You might think that you would not observe a signal - but this is not the case. Even without any pulses there is sufficient noise present to allow incoherent precession of the nuclear spins. This precession can be measured and...
[Question from NMRWiki Q&A forum] What is the optimal sample length with Shigemi tubes?
What is the optimal sample length with Shigemi tubes?
Our coil area length is 16 mm. Should we be making samples exactly 16 mm long in the Shigemi tubes for the best sensitivity (assuming that we are limited on amount of material)?
For example, we use D2O matched shigemi tubes for samples in 90/10 H2O/D2O. Is susceptibility matching affected by switch from D2O to H2O?
Thanks!
The Fantastic Four: A plug 'n' play set of optimal control pulses for enhancing NMR spectroscopy.
Linear Mode
