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Limited-Sample NMR Using Solenoidal Microcoils, Perfluorocarbon Plugs, and Capillary Spinning

Summary: Limited-Sample NMR Using Solenoidal Microcoils,
Perfluorocarbon Plugs, and Capillary Spinning
Babak Behnia and Andrew G. Webb*
Department of Electrical and Computer Engineering and Beckman Institute for Advanced Science and Technology,
University of Illinois at UrbanasChampaign, 405 North Mathews Avenue, Urbana, Illinois 61801
This study demonstrates three improvements to mass-
limited NMR using solenoidal microcoils as detectors: (1)
sample confinement using liquid perfluorocarbon plugs
to increase the observe factor, (2) design and incorpora-
tion of a capillary spinner to improve spectral line widths,
and (3) facile sample changing via the use of a capillary
insert. The probe is constructed to spin a fused silica
capillary of 530 Ám i.d., 700 Ám o.d. inside a solenoidal
coil wound around a 0.8 mm i.d., 1 mm o.d. glass
capillary. The smaller capillary contains the sample, and
capillaries with different samples can be exchanged easily.
In high-resolution limited sample microcoil NMR studies
published thus far, the length of the sample plug has been
7-10 times the length of the solenoid to avoid line
broadening from volume magnetic susceptibility ( v)


Source: Andrews, Anne M. - Huck Institutes of the Life Sciences, Pennsylvania State University


Collections: Biology and Medicine