Experimental Nuclear Magnetic Resonance Conference

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1

Nuclear magnetic resonance (NMR)

NMR is an analytical technique that places a sample in a strong magnetic field and uses radio-frequency pulses to excite atomic nuclei such as hydrogen-1, carbon-13, or nitrogen-15. The resulting signals report molecular structure, dynamics, concentration, and interactions. At ENC, NMR is the central subject, spanning method development, biomolecular spectroscopy, materials characterization, and quantitative analysis.

2

Chemical shift

Chemical shift is the resonance frequency of a nucleus measured relative to a standard reference, usually expressed in parts per million (ppm). It reflects the local electronic environment created by neighboring atoms and functional groups. ENC attendees use chemical shifts to identify compounds, assign protein resonances, monitor reactions, and compare spectra across instruments and laboratories.

3

Pulse sequence

A pulse sequence is a timed series of radio-frequency pulses, magnetic field gradients, and delays that tells an NMR spectrometer how to manipulate nuclear spins. Different sequences extract different information, such as connectivity, relaxation, diffusion, or coupling. Method-development talks at ENC often introduce new pulse sequences aimed at higher sensitivity, faster acquisition, or cleaner spectra for complex samples.

4

Cryoprobe

A cryoprobe is an NMR detector and preamplifier cooled to cryogenic temperatures to reduce electronic thermal noise. Lower noise translates into higher signal-to-noise for mass-limited or dilute samples, which is important in biomolecular NMR, metabolomics, and natural-products chemistry. Cryoprobe performance and matching to sample conditions are recurring topics in ENC vendor sessions and user talks.

5

Solid-state NMR

Solid-state NMR studies nuclei in solids, semi-solids, polymers, pharmaceuticals, and membrane systems where rapid molecular motion is absent. Techniques such as magic-angle spinning, cross-polarization, and dipolar recoupling recover high-resolution information from anisotropic interactions. At ENC, solid-state NMR appears in materials science, formulation analysis, and structural biology sessions.

6

Dynamic nuclear polarization (DNP)

DNP transfers polarization from unpaired electrons to nearby nuclei, often under microwave irradiation at low temperature, to enhance NMR signals by orders of magnitude. It is used for sensitivity-limited solid-state NMR, metabolic imaging, and materials characterization. ENC presentations on DNP typically cover radical design, polarizing agents, instrumentation, and application to challenging biological or material systems.

7

Hyperpolarization

Hyperpolarization describes methods that create nuclear spin populations far from thermal equilibrium, producing much larger NMR signals than conventional experiments. Approaches include DNP, parahydrogen-induced polarization, and optical pumping of noble gases. Hyperpolarized substrates are relevant to real-time metabolic studies and trace analysis, and ENC sessions examine both the physics and the practical chemistry of generating and using these enhanced signals.

8

Two-dimensional NMR (2D NMR)

Two-dimensional NMR spreads spectral information across two frequency axes, making it easier to resolve overlapped signals and establish connectivities between nuclei. Common experiments include COSY, TOCSY, HSQC, HMBC, and NOESY. ENC talks use 2D and higher-dimensional NMR for structure elucidation, mixture analysis, and assignment of complex biomolecules.

9

Relaxometry

Relaxometry measures NMR relaxation times, such as T1 and T2, to characterize molecular motion, pore size, binding, and contrast-agent behavior. It is used in materials, food science, petrophysics, and biomedical imaging. At a conference focused on experimental NMR, relaxometry often appears alongside method development for benchtop instruments and quantitative applications.

10

Metabolomics

Metabolomics is the systematic profiling of small molecules in biofluids, cells, or tissues. NMR is valued in metabolomics because it is quantitative, reproducible, and able to identify compounds without extensive separation. ENC presentations may cover spectral processing, metabolite identification, mixture deconvolution, and clinical or environmental metabolomics applications.

11

Paramagnetic NMR

Paramagnetic NMR studies molecules containing unpaired electrons, such as metal complexes or lanthanide-tagged proteins. Unpaired electrons create large chemical shifts and enhanced relaxation, which can provide long-range structural restraints but also complicate assignment. The topic connects ENC sessions on inorganic chemistry, protein structure, and contrast agents.

12

Electron paramagnetic resonance (EPR)

EPR, also called electron spin resonance, probes unpaired electrons in radicals, transition-metal centers, and defects. It is complementary to NMR because it targets electron spins rather than nuclear spins. At ENC, EPR often appears in discussions of DNP polarizing agents, metalloproteins, and materials with paramagnetic centers.

13

In vivo magnetic resonance spectroscopy (MRS)

In vivo MRS applies NMR principles inside living systems, usually with MRI scanners, to detect metabolites in tissue. It provides non-invasive biochemical information and is used in neuroscience, oncology, and metabolic research. ENC attendees interested in translational applications may encounter MRS alongside high-resolution NMR methodology.

14

Shimming

Shimming is the process of adjusting magnetic field homogeneity across the sample volume so that nuclei in different positions resonate at the same frequency. Good shimming produces narrow lines and reliable integrals; poor shimming causes broad, distorted peaks. It is a routine practical concern in NMR labs and a common troubleshooting topic for new users.

15

Magic-angle spinning (MAS)

Magic-angle spinning is a solid-state NMR technique in which the sample rotates rapidly at an angle of about 54.7 degrees relative to the magnetic field. This motion averages many orientation-dependent interactions and yields sharper spectra. MAS is foundational for studying polymers, pharmaceuticals, catalysts, and membrane proteins at ENC.