Extraction of T₂ from NMR linewidths in simple spin systems by use of reference deconvolution

Abstract

We investigated the possibility of obtaining transverse relaxation times through linewidth measurements in NMR spectra of simple spin systems (subsystems). The spectra are subjected to reference deconvolution and subsequently to time domain data analysis. The time for the experiment is usually short; stringent instrumental stability should be maintained during the experiment. The approach described here produces correct results if the lineshape is Lorentzian. Rough width estimation is achievable in other cases. As an additional result, detection of very small couplings is possible.

Permethylation as a strategy for high‐molecular‐weight polysaccharide structure analysis by nuclear magnetic resonance—Case study of Xylella fastidiosa extracellular polysaccharide

“…This improved spectral resolution is attributed to the elimination of intra-and inter-molecular hydrogen bonding interactions that limited the rotational freedom of native polysaccharides, as hydroxyl groups are replaced by O-methyl groups, in combination to the utilization of a less viscous solvent like chloroform-d for NMR data collection. Each polysaccharide strand is able to diffuse and rotate more freely in solution, thus increasing T 2 relaxation times, leading to narrower lines 30 observed in Figure 1 (top). Permethylation thus allowed the acquisition of NMR data that were useful for structural analysis of the EPS.…”

Permethylation as a Strategy for High Molecular Weight Polysaccharide Structure Analysis by NMR – Case Study ofXylella fastidiosaEPS

“…This improved spectral resolution is attributed to the elimination of intra-and inter-molecular hydrogen bonding interactions that limited the rotational freedom of the native polysaccharides, as hydroxyl groups are replaced by Omethyl groups, in combination to the utilization of a less viscous solvent like chloroform-d for NMR data acquisition. Each polysaccharide strand is able to diffuse and rotate more freely in solution, thus increasing the nuclei T2 relaxation time, leading to the narrower lines 30 observed in Figure 1 (top). Permethylation thus allowed the acquisition of NMR data that were useful for structure analysis of the EPS.…”

Proton $T_1$ and $T_2$ Relaxivities for $CH_2$ and $CH_3$ Peaks in Crude Oil Measured by 400 MHz NMR

“…High field NMR machines provide high sensitivity and very good shimming that minimizes the contribution of magnetic field inhomogeneity to dipolar broadening. For these reasons, calculating 1/T2 from half-height line widths of NMR peaks became more popular in the 2000s [28][29][30][31]36]. The linear relationships with the high correlation coefficients in Fig.…”