title: (17)O NMR of water in ordered environments.
abstract: Two NMR experiments are designed for selective excitation of spin I=5/2 nuclei that exhibit residual quadrupolar splittings. The I=5/2 Jeener-Broekaert experiment is preferred to the four-quantum filtration experiment as it is shown to be a more sensitive technique in experimental practice. Both techniques are applied to (17)O-enriched water in biological systems. The occurrence of water which displays a residual (17)O quadrupolar splitting is demonstrated for the first time in a model biological system and an excised tissue sample. The resulting (17)O NMR spectra are shown to have the characteristics predicted in computer-simulated I=5/2 NMR spectra.
authors.affiliation: Physical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK.
authors.forename: B
authors.initials: B
authors.lastname: Wickstead
authors.forename: S M
authors.initials: SM
authors.lastname: Grieve
authors.forename: S
authors.initials: S
authors.lastname: Wimperis