13C and1H NMR spectroscopy of plasma glucose was used to resolve the isotopomer contributions from tracer levels of [1,6-13C2]glucose, a novel tracer of glucose carbon skeleton turnover, and [U-13C]propionate, a tracer of hepatic citric acid cycle metabolism. This allowed simultaneous measurements of hepatic glucose production and citric acid cycle fluxes from the NMR analysis of a single plasma glucose sample ...
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