title: Gradient-based solvent suppression methods on a benchtop spectrometer.
abstract: Benchtop NMR emerges as an appealing alternative to widely extend the scope of NMR spectroscopy in harsh environments and for on-line monitoring. Obviously, the use of low-field magnets induces a dramatic reduction of the spectral resolution leading to frequent peak overlaps. This issue is even more serious because applications such as chemical process monitoring involve the use of non-deuterated solvents, leading to intense and broad peaks overlapping with the signals of interest. In this article, we highlight the need for efficient suppression methods compatible with flowing samples, which is not the case of the common pre-saturation approaches. Thanks to a gradient coil included in our benchtop spectrometer, we were able to implement modern and efficient solvent suppression blocks such as WET or excitation sculpting to deliver quantitative spectra in the conditions of the on-line monitoring. While these methods are commonly used at high field, this is the first time that they are investigated on a benchtop setting. Their analytical performance is evaluated and compared under static and on-flow conditions. The results demonstrate the superiority of gradient-based methods, thus highlighting the relevance of implementing this device on benchtop spectrometers. The comparison of major solvent suppression methods reveals an optimum performance for the WET-180-NOESY experiment, both under static and on-flow conditions. Copyright © 2016 John Wiley & Sons, Ltd.
authors.affiliation: CEISAM CNRS, UMR6230, Université de Nantes, Nantes, France.
authors.forename: Boris
authors.initials: B
authors.lastname: Gouilleux
authors.affiliation: CEISAM CNRS, UMR6230, Université de Nantes, Nantes, France.
authors.forename: Benoît
authors.initials: B
authors.lastname: Charrier
authors.affiliation: CEISAM CNRS, UMR6230, Université de Nantes, Nantes, France.
authors.forename: Serge
authors.initials: S
authors.lastname: Akoka
authors.affiliation: CEISAM CNRS, UMR6230, Université de Nantes, Nantes, France.|Institut Universitaire de France, Paris, France.
authors.forename: Patrick
authors.initials: P
authors.lastname: Giraudeau
keywords: WET; benchtop NMR; on-line monitoring; solvent suppression; water suppression