Offset-compensated and zero-quantum suppressed ROESY provides accurate 1H-1H distances in small to medium-sized molecules

Sándor Boros, G. Batta

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A robust version of the off-resonance ROESY pulse scheme is suggested for the measurement of proton-proton distances or slow chemical exchange in small to medium-sized molecules. The method implements adiabatic ramps to establish a pair of opposite frequency off-resonance spin lock fields - with optionally randomized duration - and adiabatic inversion pulses with simultaneous gradients for efficient zero-quantum suppression. The amended pulse sequence yields pure absorption cross-peaks and works safely for small to medium-sized molecules. The applicability of the method has been demonstrated using small, rigid molecules (strychnine and codeine) and was also applied for a cyclic peptide and a small protein. We found that the pure phase cross-peaks of the new ROESY version are beneficial for distance measurements. The one-dimensional (selective) version of the new method is also powerful for measuring selected pair-wise interactions and distance determination.

Original languageEnglish
JournalMagnetic Resonance in Chemistry
DOIs
Publication statusAccepted/In press - 2016

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Keywords

  • NMR
  • Off-resonance ROESY
  • Offset compensation
  • Zero-quantum suppression

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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