摘要:
The present invention concerns a method to determine the efficiency of a solvent to impregnate a sample material for use in a dynamic nuclear polarization (DNP) nuclear magnetic resonance (NMR) experiments, characterized in that the method comprising: - selecting a non-aqueous solvent, - providing a polarizing agent that is soluble in the non-aqueous solvent, - dissolving the polarizing agent in the non-aqueous solvent, - impregnating or dissolving the sample material with the non-aqueous solvent containing the polarizing agent, - performing a solid state DNP NMR experiment on the impregnated sample material, - determining a DNP enhancement factor of the DNP NMR experiment.