Sensitivity gains, linearity, and spectral reproducibility in nonuniformly sampled multidimensional MAS NMR spectra of high dynamic range
Abstract
Recently, we have demonstrated that considerable inherent sensitivity gains are attained in MAS NMR spectra acquired by nonuniform sampling (NUS) and introduced maximum entropy interpolation (MINT) processing that assures the linearity of transformation between the time and frequency domains. In this report, we examine the utility of the NUS/MINT approach in multidimensional datasets possessing high dynamic range, such as homonuclear 13Câ??13C correlation spectra. We demonstrate on model compounds and on 1â??73-(U-13C,15N)/74â??108-(U-15N)
E. coli thioredoxin reassembly, that with appropriately constructed 50Â*% NUS schedules inherent sensitivity gains of 1.7â??2.1-fold are readily reached in such datasets. We show that both linearity and line width are retained under these experimental conditions throughout the entire dynamic range of the signals. Furthermore, we demonstrate that the reproducibility of the peak intensities is excellent in the NUS/MINT approach when experiments are repeated multiple times and identical experimental and processing conditions are employed. Finally, we discuss the principles for design and implementation of random exponentially biased NUS sampling schedules for homonuclear 13Câ??13C MAS correlation experiments that yield high-quality artifact-free datasets.
Source: Journal of Biomolecular NMR