Solution and solid-state 33S NMR studies of 33S-labeled taurine

Sulfur-33(³³S) stable-isotope labeled taurine, 2-aminoethanesulfonic acid, has been synthesized, and a series of solution and solid-state ³³S nuclear magnetic resonance (NMR) experiments at 14.1 and 18.8 T, respectively, have been carried out at room temperature. The single peak of a solution ³³S NMR spectrum in 0.1-mM [³³S]-taurine in D₂O can be observed with the signal-to-noise (S/N) ratio of 9 in 40,000 scans, which paves the way toward in vivo analysis of pharmacokinetics and metabolism of ³³S-labeled taurine. Undistorted magic-angle-spinning (MAS) and static ³³S NMR spectra of polycrystalline [³³S]-taurine are observed with sufficient S/N ratios for analysis, and the magnitudes of ³³S EFG and CS tensors can be obtained.