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Suppressing magnetization exchange effects in stimulated-echo diffusion experiments
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0002-6524-1441
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0002-0231-3970
2013 (English)In: Journal of magnetic resonance, ISSN 1090-7807, E-ISSN 1096-0856, Vol. 234, 35-43 p.Article in journal (Refereed) Published
Abstract [en]

Exchange of nuclear magnetization between spin pools, either by chemical exchange or by cross-relaxation or both, has a significant influence on the signal attenuation in stimulated-echo-type pulsed field gradient experiments. Hence, in such cases the obtained molecular self-diffusion coefficients can carry a large systematic error. We propose a modified stimulated echo pulse sequence that contains T-2-filters during the z-magnetization store period. We demonstrate, using a common theoretical description for chemical exchange and cross-relaxation, that these filters suppress the effects of exchange on the diffusional decay in that frequent case where one of the participating spin pools is immobile and exhibits a short T-2. We demonstrate the performance of this experiment in an agarose/water gel. We posit that this new experiment has advantages over other approaches hitherto used, such as that consisting of measuring separately the magnetization exchange rate, if suitable by Goldman-Shen type experiments, and then correcting for exchange effects within the framework of a two-site exchange model. We also propose experiments based on selective decoupling and applicable in systems with no large T-2 difference between the different spin pools. (C) 2013 The Authors. Published by Elsevier Inc. All rights reserved.

Place, publisher, year, edition, pages
2013. Vol. 234, 35-43 p.
Keyword [en]
Agarose, Water, Chemical exchange, Cross-relaxation, Diffusion measurements, Pulsed-field-gradient stimulated-echo NMR, PGSTE NMR, T-2 filter
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-127741DOI: 10.1016/j.jmr.2013.06.001ISI: 000323085800005Scopus ID: 2-s2.0-84880182663OAI: oai:DiVA.org:kth-127741DiVA: diva2:646149
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council
Note

QC 20140616

Available from: 2013-09-06 Created: 2013-09-05 Last updated: 2017-12-06Bibliographically approved

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Dvinskikh, Sergey V.Furó, István

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Applied Physical ChemistryWallenberg Wood Science Center
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