Results 251 to 260 of about 411,311 (295)

Monitoring of the Biotechnological Production of Dihydroxyacetone Using a Low-Field ¹H NMR Spectrometer. [PDF]

Biotechnol Bioeng
Mahler L, Tasdemir E, Nickisch-Hartfiel A, Mayer C, Jaeger M.   +4 more
europepmc   +1 more source

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1H‐NMR Microscopy of Tablets *

Journal of Pharmaceutical Sciences, 1995
A 1H-nuclear magnetic resonance (NMR) microscopy method was utilized for the first time to determine the porosity distribution of physically intact tablets. The main advantage of this newly developed method was that porosity cross sections through whole tablets or specific locations could be obtained without mechanically destroying the tested tablet ...
G, Nebgen, D, Gross, V, Lehmann, F, Müller   +3 more
openaire   +2 more sources

Characterization of heroin samples by 1H NMR and 2D DOSY 1H NMR

Forensic Science International, 2014
Twenty-four samples of heroin from different illicit drug seizures were analyzed using proton Nuclear Magnetic Resonance ((1)H NMR) and two-dimensional diffusion-ordered spectroscopy (2D DOSY) (1)H NMR. A careful assignment and quantification of (1)H signals enabled a comprehensive characterization of the substances present in the samples investigated:
Stéphane, Balayssac, Emmanuel, Retailleau, Geneviève, Bertrand, Marie-Pierre, Escot, Robert, Martino, Myriam, Malet-Martino, Véronique, Gilard   +6 more
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Quantitative 1H NMR spectroscopy

TrAC Trends in Analytical Chemistry, 2012
Abstract This review illustrates the need to use nuclear magnetic resonance (NMR) spectroscopy for the quantitative analysis of small molecules in their crude forms and in mixtures. We provide the basic concepts of quantitative NMR (qNMR), a brief description of important acquisition and processing parameters responsible for obtaining high-quality ...
Santosh Kumar Bharti, Raja Roy
openaire   +1 more source

1H-NMR characterization of cucumber peroxidases

Biochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology, 1991
Two peroxidase isoenzymes from Cucumber seedlings, one acidic (pI = 4) and one basic (pI = 9), were characterized by 1H-NMR spectroscopy. The NMR spectra were obtained in the native (ferric high-spin) and cyanide ligated (ferric low-spin) forms of both isoenzymes. The NMR spectral comparison of paramagnetically shifted resonances with those of the well
L B, Dugad, H M, Goff, F B, Abeles
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1H NMR Spectroscopy

2000
Electronegative substituents cause a decrease in |J|gem while a double or triple bond next to the CH2 group causes an increase.
Ernoe Pretsch, Philippe Bühlmann, Christian Affolter   +2 more
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1H NMR Spectroscopy

2009
Electronegative substituents cause a decrease in |J|gem while a double or triple bond next to the CH2 group causes an increase.
Ernö Pretsch, Philippe Bühlmann, Martin Badertscher   +2 more
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1H NMR Study of Polyisoprenes

Rubber Chemistry and Technology, 1980
Abstract 1H NMR spectra of polyisoprene were assigned using polymers of isoprene-1,1,4,4-d4, isoprene-1,1,5,5,5-d5, and isoprene-4,4-d2 polymerized with various catalysts. The methylene-proton signal at 2.1 ppm in cis-1,4- and trans-1,4-polyisoprenes was divided into H4- and H1-proton signals; H4 resonated at 2.21 ppm in both cis-1,4
H. Sato, Y. Tanaka
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Lipid Profiling Using 1H NMR Spectroscopy

2019
Lipid profiling, which includes fatty acids, phospholipids, glycerides, and cholesterols is extremely important because of the essential role lipids play in the regulation of metabolism in animals. 1H-NMR-based protocols for high-throughput lipid analysis in complex mixtures have been developed and applied to biological systems.
Miriam, Gil, Sara, Samino, Rubén, Barrilero, Xavier, Correig   +3 more
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