Translational motion in solution, either diffusion or fluid flow, is at the heart of chemical and biochemical reactivity. Nuclear Magnetic Resonance (NMR) provides a powerful non-invasive technique for studying the phenomena using magnetic field gradient methods. Describing the physical basis of measurement techniques, with particular emphasis on diffusion, balancing theory with experimental observations and assuming little mathematical knowledge, this is a strong, yet accessible, introduction to the field. A detailed discussion of magnetic field gradient methods applied to Magnetic Resonance Imaging (MRI) is included, alongside extensive referencing throughout, providing a timely, definitive book to the subject, ideal for researchers in the fields of physics, chemistry and biology.

/pdf/nmr-studies-of-translational-motion-1y45lcz4az.pdf

NMR Studies of Translational Motion

Low-field permanent magnets for industrial process and quality control.

Diffusion-ordered spectroscopy (DOSY) is a powerful method for the NMR analysis of mixtures such as crude synthetic products, biofluids or biological extracts. Mixtures can be analysed without the need for any physical separation, and the method requires only standard NMR pulsed field gradient hardware. Existing pulse sequences for DOSY require extensive and time-consuming phase cycling for clean results. A new sequence is reported here which allows clean spectra with good lineshapes to be obtained using as little as one transient per gradient value. Asymmetric bipolar field gradient pulse pairs are used in conjunction with extra balancing gradient pulses, selecting a unique coherence transfer pathway but minimizing eddy current effects and field-frequency lock disturbance. Using the new sequence, high-resolution proton DOSY spectra can be obtained in less than 1 min. Copyright © 2002 John Wiley & Sons, Ltd.

A one‐shot sequence for high‐resolution diffusion‐ordered spectroscopy

In the present review we describe the emerging tendency for creating target-oriented analytical approaches designed to solve important chemical tasks by using a combination of analytical tools. The concept is illustrated by selected examples of advances of NMR spectroscopy, mass spectrometry and electron microscopy in the analysis and study of gas-phase, liquid-state and solid-state chemical systems. Comparative description of chemical applications of these analytical methods is presented and discussed. The bibliography includes 359 references.

https://iopscience.iop.org/article/10.1070/RC2013v082n07ABEH004413/pdf

Target-oriented analysis of gaseous, liquid and solid chemical systems by mass spectrometry, nuclear magnetic resonance spectroscopy and electron microscopy

Time-domain NMR is being used throughout all areas of food science and technology. A wide range of one- and two-dimensional relaxometric and diffusometric applications have been implemented on cost-effective, robust and easy-to-use benchtop NMR equipment. Time-domain NMR applications do not only cover research and development but also quality and process control in the food supply chain. Here the opportunity to further downsize and tailor equipment has allowed for “mobile” sensor applications as well as online quality inspection. The structural and compositional information produced by time-domain NMR experiments requires adequate data-analysis techniques. Here one can distinguish model-driven approaches for hypothesis testing, as well as explorative multi-variate approaches for hypothesis generation. Developments in hardware and software will further enhance measurement speed and reveal more detailed structural features in complex food systems.

Time domain NMR applied to food products

Difftrain: A Novel Approach to a True Spectroscopic Single-Scan Diffusion Measurement

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Difftrain: A Novel Approach to a True Spectroscopic Single-Scan Diffusion Measurement