Hydrogen-1 Nmr
Hydrogen-1 Nmr - Related Videos
04:33
Quantitative In-Cell Hydrogen NMR Spectroscopy to Monitor Protein-Ligand Interactions
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2025
In this video, we demonstrate the in-cell nuclear magnetic resonance spectroscopy technique to study protein-ligand interactions between unlabeled overexpressed proteins and small molecules. The successful ligand-protein interaction is confirmed visually by the appearance of an additional set of peaks in the spectral region of interest that gradually replaces the original peaks.
06:06
Hydrogenation
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2023
Source: Vy M. Dong and Zhiwei Chen, Department of Chemistry, University of California, Irvine, CA This experiment will demonstrate the hydrogenation of chalcone as an example of an alkene hydrogenation reaction (Figure 1). In this experiment, palladium on carbon (Pd/C) will be used as a heterogeneous catalyst for the process. A balloon will be used to supply the hydrogen atmosphere. Figure 1: Diagram showing the hydrogenation of chalcone to 3-phenylpropiophenone.
14:44
Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Cited by 4 •
2013
The NMR-solution structure of a metallochaperone model peptide with Cu (I) was determined, and a detailed protocol from sample preparation and 1D and 2D data collection to a three-dimensional structure is described.
07:54
Assessing Hepatic Metabolic Changes During Progressive Colonization of Germ-free Mouse by 1H NMR Spectroscopy
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Cited by 6 •
2011
A progressive colonization procedure is described to further assess its impact on the host hepatic metabolism. Colonization is monitored non invasively by evaluating the urinary excretion of microbial co-metabolites by NMR-based metabolic profiling while hepatic metabolism is assessed by High Resolution Magic Angle Spinning (HR MAS) NMR profiling of intact biopsy.
01:10
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule
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2024
In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1 triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the others.
FAQs
Chemical shifts report differences in resonance frequency caused by a proton’s molecular environment. Protons in non-equivalent environments therefore appear at different positions in the spectrum, allowing chemists to count distinct hydrogen environments and use their positions as structural clues. Comparing chemical-shift patterns across a compound helps distinguish possible molecular structures rather than relying on total hydrogen content alone.
Integration estimates the relative number of hydrogens represented by each signal, while spin-spin splitting provides information about neighboring nuclei. Used together, these features connect signal size with local proton relationships. That combination helps chemists move from simply recognizing separate hydrogen environments to proposing how portions of an organic molecule are connected.
Changes in a spectrum can provide insight into exchange, conformation, and molecular dynamics. These observations extend interpretation beyond fixed chemical connectivity by showing that hydrogen environments may be influenced by processes occurring within the molecule. Consequently, Hydrogen-1 NMR can contribute information about structural behavior as well as molecular composition and connectivity.
A practical interpretation begins by identifying distinct signals and their chemical-shift positions. Chemists then compare integrations to estimate the relative numbers of hydrogens and examine spin-spin splitting for evidence of neighboring nuclei. Combining these observations supports structural assignments, because each feature contributes a different type of information about the molecule.
Chemists compare the observed chemical shifts, integrations, and splitting patterns with the structural features expected for the compound. Agreement among these measurements supports identity, while the overall spectral pattern provides evidence for sample composition and purity. This makes the technique useful when characterization requires more than confirming that a hydrogen-containing substance is present.
Chemists monitor reactions by examining how the spectrum changes as the reaction proceeds. Shifts in signals, integrations, or splitting patterns can reflect changes in hydrogen environments and molecular connectivity. Tracking these spectral features provides a way to evaluate reaction progress while also helping characterize the compounds present during the chemical process.