The NOAH HSQC-COSY module revisited: A theoretical and practical comparison of pulse sequences

• Published in: Journal of magnetic resonance (1997) Vol. 367; p. 107759
• Main Authors: Yong, Jonathan R.J., Kupče, Ēriks, Claridge, Tim D.W.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01-10-2024
• Subjects: COSY; HSQC; HSQC-COSY; NOAH; Supersequence; Supersequence; NOAH; HSQC; HSQC-COSY; COSY
• ISSN: 1090-7807; 1096-0856; 1096-0856
• DOI: 10.1016/j.jmr.2024.107759

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•Detailed discussion of HSQC-COSY implementations in NMR supersequences.•Comparison of HSQC-COSY with HSQC-TOCSY.•Sensitivity analyses of modules within typical NMR supersequences involving HSQC-COSY experiments.
NMR supersequences, as exemplified by the NOAH (NMR by Ordered Acquisition using 1H detection) technique, are a powerful way of acquiring multiple 2D data sets in much shorter durations. This is accomplished through targeted excitation and detection of the magnetisation belonging to specific isotopologues (‘magnetisation pools’). Separately, the HSQC-COSY experiment has recently seen an increase in popularity due to the high signal dispersion in the indirect dimension and the removal of ambiguity traditionally associated with HSQC-TOCSY experiments. Here, we describe how the HSQC-COSY experiment can be integrated as a ‘module’ within NOAH supersequences. The benefits and drawbacks of several different pulse sequence implementations are discussed, with a particular focus on how sensitivities of other modules in the same supersequence are affected.