title: Improved DOSY NMR data processing by data enhancement and combination of multivariate curve resolution with non-linear least square fitting.
abstract: The quality of DOSY NMR data can be improved by careful pre-processing techniques. Baseline drift, peak shift, and phase shift commonly exist in real-world DOSY NMR data. These phenomena seriously hinder the data analysis and should be removed as much as possible. In this paper, a series of preprocessing operations are proposed so that the subsequent multivariate curve resolution can yield optimal results. First, the baseline is corrected according to a method by Golotvin and Williams. Next, frequency and phase shift are removed by a new combination of reference deconvolution (FIDDLE), and a method presented by Witjes et al. that can correct several spectra simultaneously. The corrected data are analysed by the combination of multivariate curve resolution with non-linear least square regression (MCR-NLR). The MCR-NLR method turns out to be more robust and leads to better resolution of the pure components than classic MCR.
authors.affiliation: Laboratory of Analytical Chemistry, University of Nijmegen, Toenooiveld 1, 6525 ED Nijmegen, The Netherlands.
authors.forename: R
authors.initials: R
authors.lastname: Huo
authors.forename: R
authors.initials: R
authors.lastname: Wehrens
authors.forename: L M C
authors.initials: LM
authors.lastname: Buydens