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Default Diffusion NMR studies of macromolecular complex formation, crowding and confinement in soft materials

Diffusion NMR studies of macromolecular complex formation, crowding and confinement in soft materials


Publication date: May 2016
Source:Progress in Nuclear Magnetic Resonance Spectroscopy, Volumes 94–95

Author(s): Suliman Barhoum, Swomitra Palit, Anand Yethiraj

Label-free methods to obtain hydrodynamic size from diffusion measurements are desirable in environments that contain multiple macromolecular species at a high total concentration: one example is the crowded cellular environment. In complex, multi-species macromolecular environments – in this article, we feature aqueous systems involving polymers, surfactants and proteins – the link between dynamics and size is harder to unpack due to macromolecular crowding and confinement. In this review, we demonstrate that the pulsed-field gradient NMR technique, with its spectral separation of different chemical components, is ideal for studying the dynamics of the entire system simultaneously and without labelling, in a wide range of systems. The simultaneous measurement of the dynamics of multiple components allows for internal consistency checks and enables quantitative statements about the link between macromolecular dynamics, size, complex formation and crowding in soft materials.
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