Results 261 to 270 of about 383,654 (289)
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Microscale Synthesis and 1H NMR Analysis of Tetraphenylporphyrins
Journal of Chemical Education, 1999The synthesis of tetraphenylporphyrin, H2[TPP], and para-substituted tetraphenylporphyrins, H2[(p-X)4TPP], where X = CN, CH3, and OCH3, is easily accomplished using microscale glassware.
Diane F. Marsh +2 more
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Quantitative 1H NMR analysis of alkaline polysulfide solutions
Holzforschung, 2005Abstract A novel analytical protocol for the absolute determination of the various polysulfide species present in alkaline aqueous media was developed. The method is comprised of alkylating polysulfide ions with dimethyl sulfate, followed by quantitative proton NMR spectroscopy using 1,3,5-tributyl benzene as the internal standard. In order
Dimitris S. Argyropoulos +4 more
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Quantitative analysis of enalapril by 1H NMR spectroscopy in tablets
Journal of Pharmaceutical and Biomedical Analysis, 2005A simple, rapid, accurate and selective 1H NMR method was developed for quantitative determination of enalapril maleate in pharmaceutical preparations. Spectra were determined in D2O, using L-leucine as internal standard. Both synthetic mixtures and commercial dosage forms were assayed, and the results were compared to those obtained using the USP XXIV
Ariana, Zoppi +2 more
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1H NMR analysis as a diagnostic probe for human saliva
Biochemical and Biophysical Research Communications, 2005The applications of high resolution (1)H NMR analysis as a diagnostic probe for human saliva are reviewed with special reference to diabetes mellitus, and a recently published report regarding the ability of this technique to detect advanced glycation endproducts (AGEs) in this biofluid [Biochem. Biophys. Res. Commun. 323 (2004) 377-381].
Martin, Grootveld +1 more
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Clinical analysis in intact erythrocytes using 1H spin echo NMR
Clinica Chimica Acta, 1991A new method of clinical analysis based on 1H spin echo NMR spectroscopy is presented. It is capable of providing information on six metabolites within viable erythrocytes, directly and without any preparative procedures prior to analysis except for cell separation and washing.
J, Reglinski +8 more
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Comparative 1H NMR-based metabonomic analysis of HIV-1 sera
Journal of Biomolecular NMR, 2009(1)H NMR spectroscopy of sera from HIV-1 infected and uninfected individuals was performed on 300 and 600 MHz instruments. The resultant spectra were automatically data reduced to 90 and 180 integral segments of equal length. Analysis of variance identified significant differences between the sample groups, especially for the samples analyzed on 600 ...
C, Philippeos, F E, Steffens, D, Meyer
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1H NMR structural analysis of novel potassium blocking toxins using a nano-NMR probe
Toxicon, 1998A new class of toxin acting on potassium channels and cross-linked by four disulfide bridges instead of three has been recently described. Two peptides, Pi1 and Pi7, purified from the venom of the scorpion Pandinus imperator belong to this new class. Structural features of one of these new toxins.
Delepierre, Muriel +2 more
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Liquid state 1H high field NMR in food analysis
Progress in Nuclear Magnetic Resonance Spectroscopy, 2012WOS ...
L Mannina, A P Sobolev, S Viel
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A 13C and 1H NMR analysis of perfumes
Russian Journal of Applied Chemistry, 2006Composition of a series of formulations used in Russia for production of various perfumes, among them car air fresheners, was studied by 13C and 1H NMR. The main components were identified, approximate compositions of several perfumes were determined, and spectral data are given.
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1H NMR Spectroscopy and Conformational Analysis of N-Benzylimidazolidines
HETEROCYCLES, 20031H NMR spectra of a series of 1-benzyl- and 1,3-dibenzylimidazolidines are analyzed and correlated with their conformational features. The spectra are assigned on the basis of chemical shifts and proton coupling constant values, and confirmed by NOESY spectra. C 2 -Unsubstituted imidazolidines (1, 9) show a fast inversion of the nitrogen atoms.
Isabel A. Perillo +2 more
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