NMR Relaxation Studies of Solute-Solvent Interactions

Bryant, R. G.

doi:10.1146/annurev.pc.29.100178.001123

Cited by 70 publications

(36 citation statements)

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“…At the mole ratio of 29:1, the rotational averaging included by Eq. [3] is no longer required, and the simpler model of Eq. [2] is sufficient to account for the shape of the dispersion profile.…”

Section: Dependence On Cross-linking Agent Concentrationmentioning

confidence: 99%

Magnetization transfer, cross‐relaxation, and chemical exchange in rotationally immobilized protein gels

Zhou

Bryant

1994

Magnetic Resonance in Med

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Water proton spin-lattice relaxation rates are reported as a function of the magnetic field strength for cross-linked bovine serum albumin samples. The relaxation dispersion profile is analyzed using a relaxation model where the solid components have the magnetic field dependence proportional to v-0.5 which may result from a defect diffusion model with two degrees of freedom. If the cross-linking agent concentration is not sufficiently high, the relaxation dispersion curve may have significant contributions from freely rotating protein. The magnetic field dependence of the relaxation rates studied as a function of the proton mole fraction in the sample show that approximately 30% of the magnetization transfer rate is directly proportional to the proton mole fraction. This contribution is identified with the magnetization transfer from exchange of whole water molecules with buried binding sites on the protein. The second order magnetization transfer rate constant is 388 s-1 assuming unit water spin concentration. The solid component relaxation obeys an Arrhenius activation law, but the overall temperature dependence of the cross-relaxation is complicated by chemical exchange processes which enter with opposite sign.

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Section: Dependence On Cross-linking Agent Concentrationmentioning

confidence: 99%

Magnetization transfer, cross‐relaxation, and chemical exchange in rotationally immobilized protein gels

Zhou

Bryant

1994

Magnetic Resonance in Med

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“…However, in gaseous and liquid oxygen, there is apparently only a very small difference in the potential-energy surfaces for the singlet, triplet and quintuplet states of (02) NMR spectroscopy is a useful probe of molecular interactions in gases (Refs. [48][49][50] and condensed phases (Ref s. [51][52][53]. Hyperfine splittings may be seen as a result of solvent interaction with a magnetic solute (Ref.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

The effects of collisions on molecular properties

Buckingham¹

1980

Pure and Applied Chemistry

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-This lecture is concerned with the changes in molecular properties that result from intermolecular forces. In addition to the potential energy, the optical, electric and magnetic properties of molecules, as well as transition probabilities, may change as a result of collisions. Some properties, such as simultaneous transitions and the circular dichroism of an achiral solute in a chiral solvent, result entirely from the interaction.In the general theory of the effects of long-range intermolecular forces on molecular properties, the change is expressed in terms of properties of the free molecules. The usefulness and limitations of such a description are considered. Progress in understanding intermolecular forces and solvent effects will depend upon a combination of experiment, ab initio computation and simulation.

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“…The best evidence is found in Volume 29 of this series. In this single volume (1978), reviews appeared on the following four topics: "NMR Relaxation Studies of Solute-Solvent Interactions" by Bryant (22); "NMR Studies of Mem brane Structure and Dynamics" by Bocian & Chan (23); "High Resolu tion NMR Studies of the Structure and Dynamics of tRNA in Solution" by Patel (24); and "High Resolution Solid State NMR" by Vaughan (25 ).…”

Section: Nmr-a Rapidly Expanding Fieldmentioning

confidence: 99%