Convection-compensating PGSE experiment incorporating excitation-sculpting water suppression (CONVEX)

Momot, Konstantin I. & Kuchel, Philip W. (2004) Convection-compensating PGSE experiment incorporating excitation-sculpting water suppression (CONVEX). Journal of Magnetic Resonance, 169(1), pp. 92-101.

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We present a new diffusion experiment which provides simultaneous suppression of an on-resonance solvent peak and compensation for convection. The experiment, which we name CONVEX, exploits similarities between two functionally different pulse sequences to enable the same sequence to be used simultaneously for two different purposes. The CONVEX pulse sequence combines a double-echo PGSE with double excitation-sculpting water suppression, using unequal gradient pulse-pair amplitudes (g1 and g2) and unequal diffusion intervals (Del1 and Del2). Convection compensation is achieved by setting g1 : g2 = Del2 : Del1. The new experiment provides the spectral quality, flat baseline, and water-suppression power characteristic of excitation-sculpting experiments, combined with excellent compensation for convection. The resulting Stejskal–Tanner plots are linear over a greater range of signal attenuation than in the absence of water suppression. Possible applications include protein NMR; NMR of cellular or colloidal systems; and the monitoring of technological processes.

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26 citations in Web of Science®

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395 since deposited on 14 Dec 2005
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ID Code: 2903
Item Type: Journal Article
Refereed: Yes
Keywords: Nuclear magnetic resonance, Excitation sculpting solvent suppression, Convection, compensating PGSE, Diffusion and flow measurements by NMR, Stejskal–Tanner plots
DOI: 10.1016/j.jmr.2004.04.007
ISSN: 1090-7807
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2004 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 14 Dec 2005 00:00
Last Modified: 29 Feb 2012 13:20

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