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A combination of solid phase extraction, para-hydrogen induced hyperpolarization and selective NMR detection allows the quantitative determination of a doping substance at sub-μM concentrations in urine.
I. Reile, N. Eshuis, N. K. J. Hermkens, B. J. A. van Weerdenburg, M. C. Feiters, F. P. J. T. Rutjes, M. Tessari. "NMR detection in biofluid extracts at sub-μM concentrations via para-H2 induced hyperpolarization." The Analyst 141.13 (2016) 4001-4005