Protein-induced water 1H MR frequency shifts: contributions from magnetic susceptibility and exchange effects.
Protein-induced water 1H MR frequency shifts: contributions from magnetic susceptibility and exchange effects.
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DOI:
10.1016/j.jmr.2009.10.005
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发表时间:
2010-01
期刊:
影响因子:
--
通讯作者:
Yablonskiy DA
中科院分区:
文献类型:
--
作者:
Luo J;He X;d'Avignon DA;Ackerman JJ;Yablonskiy DA
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 1H 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 1H 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 1H sites on proteins, causing a shift to higher frequency. At 37°C the amplitude of the exchange effect is roughly half that of the susceptibility effect.
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影响因子:
3.3
作者:
CHU, SCK;XU, Y;SPRINGER, CS
通讯作者:
SPRINGER, CS
DOI:
10.1073/pnas.0610821104
发表时间:
2007-07-10
影响因子:
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作者:
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影响因子:
3.3
作者:
Spees, WM;Yablonskiy, DA;Ackerman, JJH
通讯作者:
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