NMR Artefacts Caused by Decoupling of Multiple-Spin Coherences: Improved SLAP Experiment.

0456749 - ÚCHP 2016 RIV US eng J - Článek v odborném periodiku
Blechta, Vratislav - Schraml, Jan
NMR Artefacts Caused by Decoupling of Multiple-Spin Coherences: Improved SLAP Experiment.
Magnetic Resonance in Chemistry. Roč. 53, č. 6 (2015), s. 460-466. ISSN 0749-1581. E-ISSN 1097-458X
Institucionální podpora: RVO:67985858
Klíčová slova: composite decoupling * SLAP * BIRD
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
Impakt faktor: 1.226, rok: 2015

Contrary to common expectations multiple-spin coherences containing products of proton and heteronucleus operators (e.g. HuCx, u = x, y, z) can produce not only sidebands but also noticeable centerband NMR signals of the heteronucleus during acquisition under 1H broadband decoupling. Such centerband signals of low abundant heteronuclei can be sources of relatively strong unexpected artifacts in NMR experiments which aim to detect very weak signals from much less-abundant isotopomers, e.g. 13C-13C ones. These findings lead to a new design of SLAP pulse sequence (MSS-SLAP) with improved suppression of centerband peaks which are due to singly, e.g. 13C, labeled molecules (parent peaks). The MSS-SLAP experiment and its MSS-BIRD-SLAP variant are compared with a few older SLAP versions.
Trvalý link: http://hdl.handle.net/11104/0257235