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NMR Reference Standards
Sigma-Aldrich.com provides an informational article regarding the use of stable, labeled isotopes as NMR reference standards.
NMR Chemical Shifts of Impurities Charts
Reference or download our NMR shifts charts for the most common deuterated solvents. Proton NMR and carbon NMR tables aid chemists in separating signals of impurities that might originate from residual solvents or a reaction apparatus.
Use of 13C Isotopes
Dr. Pratip Bhattacharya, California Institute of Technology. "Stable isotopes have played a very useful role in MR research which involves both MRI and MRS.
Traceable Organic Certified Reference Materials for P-31 qNMR
The use of CRMs for the NMR quantification of phosphorylated organic compounds and metabolites offers several advantages as it is based on a signal comparison of the analyte with an internal or external reference standard.
NMR Deuterated Solvent Properties Reference Chart
Use this reference table to find the coupling values and chemical shifts of our NMR (deuterated) solvents. Melting and boiling points, molecular weight, density, and CAS number are also listed.
Dynamic Nuclear Polarization
Dynamic Nuclear Polarization (DNP) is a phenomenon by which high spin polarization, typically derived from a bath of free radical electrons, is transferred to a nuclear spin bath, enhancing the difference between the nuclear energy levels and thereby producing dramatically
Isotopic Labeling for NMR Spectroscopy of Biological Solids
Isotopic Labeling for NMR Spectroscopy of Biological Solids;
Certified Reference Materials for ¹⁹F Quantitative NMR Ensuring Traceability to “The International System of Units” (SI)
In certain cases, 1H qNMR reaches its limits, especially regarding the certification of complex and larger molecules. However, new fields of application often also bring along the presence of heteroatoms, namely 31P and 19F. We therefore introduced 3 CRMs for
Analytical Reference Standards: Synthesis and Characterization
As a major metabolite of methylphenidate (1, Ritalin), ±-threo-Ritalinic acid (2) is of clinical relevance.
Certified Reference Materials: Synthesis and Characterization of Cocaine N-oxide HCl
Cocaine is one of the most widespread illicit drugs of abuse in the US. Cocaine N-oxide is a metabolite of cocaine formed by cytochrome P-450 mediated oxidation of cocaine.1,2
NMR Analysis of Glycans
Nuclear magnetic resonance (NMR) spectroscopy measures the extent to which a glycan or other molecule distorts a magnetic field.
Selective Protonation of Methyl Groups in Highly Deuterated Proteins
Sigma-Aldrich presents an article about the selective protonation of methyl groups in highly deuterated proteins. In which the structural NMR studies of small proteins, a maximum number of proton chemical shifts are usually assigned and NOEs connecting large numbers of
Solid-state NMR on Larger Biomolecules
Solid-state NMR on Larger Biomolecules; Sigma-Aldrich.com
Biomolecular NMR: Isotope Labeling Methods for Protein Dynamics Studies
We presents an informational article concerning biomolecular NMR and the use of Isotope Labeling Methods for Protein Dynamics Studies.