TY - JOUR
T1 - Proton NMR spectroscopy of solvent-saturable resonances
T2 - A new approach to study pH effects in situ
AU - Mori, Susumu
AU - Eleff, Scott M.
AU - Pilatus, Ulrich
AU - Mori, Noriko
AU - Van Zijl, Peter C.M.
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 1998/7
Y1 - 1998/7
N2 - It is shown that the effect of pH changes can be measured in proton NMR spectra through the pH sensitivity of the signal intensities of metabolite protons exchanging with water. To observe this phenomenon, pulse sequences must be used that can sensitively observe these exchangeable protons under physiological conditions, which is achieved by avoiding magnetization transfer signal losses due to water saturation for solvent suppression purposes, These methods provide an order-of-magnitude enhancement of many signals between 5 and 10 ppm, containing both N-bound protons as well as aromatic C-H protons coupled to them, the intensity of which is influenced by exchange-relayed saturation. As a first application, the effects of pH change on these resonances are studied ex vivo (perfused cells) and in vivo (cat brain).
AB - It is shown that the effect of pH changes can be measured in proton NMR spectra through the pH sensitivity of the signal intensities of metabolite protons exchanging with water. To observe this phenomenon, pulse sequences must be used that can sensitively observe these exchangeable protons under physiological conditions, which is achieved by avoiding magnetization transfer signal losses due to water saturation for solvent suppression purposes, These methods provide an order-of-magnitude enhancement of many signals between 5 and 10 ppm, containing both N-bound protons as well as aromatic C-H protons coupled to them, the intensity of which is influenced by exchange-relayed saturation. As a first application, the effects of pH change on these resonances are studied ex vivo (perfused cells) and in vivo (cat brain).
KW - Cat brain
KW - Exchangeable protons
KW - Perfused cells
KW - Saturation transfer
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U2 - 10.1002/mrm.1910400105
DO - 10.1002/mrm.1910400105
M3 - Article
C2 - 9660550
AN - SCOPUS:0031867371
SN - 0740-3194
VL - 40
SP - 36
EP - 42
JO - Magnetic resonance in medicine
JF - Magnetic resonance in medicine
IS - 1
ER -