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Attenuation of Cross-Peak Intensities in QUIET-BIRD-NOESY Experiments

✍ Scribed by Brian Cutting; Geoffrey Bodenhausen

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 80 KB
Volume: 140
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.1999.1848

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✦ Synopsis

The buildup curves in QUIET-BIRD-NOESY experiments, which are designed to isolate two-spin subsystems within macromolecules, are attenuated by transverse relaxation and evolution under homonuclear couplings during the bilinear rotation decoupling (BIRD) pulse sandwich. If the signals of both source and target spins are attenuated equally (uniform damping), this is readily accounted for by normalizing the cross peaks with respect to the diagonal peaks. However, unequal attenuation of source and target spins (differential damping) affects the initial buildup slopes and hence leads to apparent cross-relaxation rates that are significantly distorted from their true values. A simple method for recognizing this situation and extracting accurate cross-relaxation rates is presented.

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