Gradient-based solvent suppression methods on a benchtop spectrometer.

Area of Science:

• Analytical Chemistry
• Spectroscopy
• Chemical Engineering

Background:

• Benchtop NMR spectroscopy is a promising tool for analyzing samples in challenging environments and for real-time process monitoring.
• Low-field magnets in benchtop NMR reduce spectral resolution, causing peak overlaps, especially with non-deuterated solvents common in process monitoring.

Purpose of the Study:

• To investigate efficient solvent suppression techniques for benchtop NMR spectroscopy compatible with flowing samples.
• To evaluate the performance of gradient-based solvent suppression methods (WET, excitation sculpting) in a benchtop NMR setting for on-line monitoring.

Main Methods:

• Implementation of WET and excitation sculpting solvent suppression techniques on a benchtop NMR spectrometer equipped with a gradient coil.
• Comparison of analytical performance of these methods under static and on-flow conditions.
• Evaluation of the WET-180-NOESY experiment for solvent suppression.

Main Results:

• Gradient-based solvent suppression methods significantly improve spectral resolution and reduce peak overlap in benchtop NMR.
• These methods are effective for on-line monitoring of chemical processes using non-deuterated solvents.
• The WET-180-NOESY experiment demonstrated optimal performance for solvent suppression in both static and on-flow conditions.

Conclusions:

• Gradient coil implementation is crucial for enhancing benchtop NMR capabilities, enabling advanced solvent suppression techniques.
• Gradient-based methods offer superior performance over traditional approaches for on-line monitoring applications.
• The WET-180-NOESY experiment is highly effective for solvent suppression in benchtop NMR, facilitating quantitative analysis.