Protein-induced water 1H MR frequency shifts: contributions from magnetic susceptibility and exchange effects.

Abstract

Defining the biophysics underlying the remarkable MRI phase contrast reported in high field MRI studies of human brain would lead to more quantitative image analysis and more informed pulse sequence development. Toward this end, the dependence of water (1)H resonance frequency on protein concentration was investigated using bovine serum albumin (BSA) as a model system. Two distinct mechanisms were found to underlie a water (1)H resonance frequency shift: (i) a protein-concentration-induced change in bulk magnetic susceptibility, causing a shift to lower frequency, and (ii) exchange of water between chemical-shift distinct environments, i.e., free (bulk water) and protein-associated ("bound") water, including freely exchangeable (1)H sites on proteins, causing a shift to higher frequency. At 37 degrees C the amplitude of the exchange effect is roughly half that of the susceptibility effect.

DOI: 10.1016/j.jmr.2009.10.005

Statistics

020402011201220132014201520162017
Citations per Year

64 Citations

Semantic Scholar estimates that this publication has 64 citations based on the available data.

See our FAQ for additional information.

Cite this paper

@article{Luo2010ProteininducedW1, title={Protein-induced water 1H MR frequency shifts: contributions from magnetic susceptibility and exchange effects.}, author={Jie Luo and Xiang He and D Andre' d'Avignon and Joseph J. H. Ackerman and Dmitriy A. Yablonskiy}, journal={Journal of magnetic resonance}, year={2010}, volume={202 1}, pages={102-8} }