assay NMR spectroscopy assay An assay that exploits the magnetic properties of certain nuclei (those with a spin) to resonate when placed in particular magnetic field conditions. Instruments recording NMR spectrum and sets of analysis can be used to deduce identity of chemical as well as composition of complex chemical mixtures. Metabolic profiling studies on the toxicological effects of realgar in rats by (1)H NMR spectroscopy. Wei L, Liao P, Wu H, Li X, Pei F, Li W, Wu Y. Toxicol Appl Pharmacol. 2008 Nov 25. PMID: 19073202 Nuclear magnetic resonance spectroscopy Philippe Rocca-Serra url:https://en.wikipedia.org/wiki/Nuclear_magnetic_resonance_spectroscopy NMR spectroscopy assay metadata incomplete