β Scribed by David I. Hoult; Roxanne Deslauriers
No coin nor oath required. For personal study only.
Accurate quantitation of metabolites in biological samples of irregular shape and inβhomogeneous composition is generally acknowledged to be difficult. The difficulties are less pronounced with a probe having excellent B~1~ field homogeneity, high sensitivity, and a resonant frequency independent of sample size and composition. A prototype probe that aims to fulfill these requirements in wideβbore horizontal magnets is described. It comprises four separate tuned rings on a spherical surface which give a B~1~ field that is flat to Β±1% over the design volume. Interβring coupling, and to a fifth ring used for matching, is by induction, and the mathematics of the tuning of the system are derived. It is shown that resonant frequency variation with sample size is negligible, and that the sensitivity closely approaches the theoretical limit. Β© 1990 Academic Press, Inc.
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A method for the separation of benzene metabolites using reverse-phase high-pressure liquid chromatography is described. The antoxidant, ascorbic acid is added to an aqueous mixture of 1,2&benzenetriol, hydroquinone, catechol, and phenol, to prevent autooxidation. The eluting solvents are equilibrat