Method for separating oil-water two-phase NMR signals by using dynamic nuclear polarization

A method for analyzing a two-phase sample based on dynamic nuclear polarization (DNP) based nuclear magnetic resonance (NMR), comprising:

• preparing a sample for analysis, wherein the sample comprises an oil phase and a water phase,
• adding a composition to the sample, wherein the composition comprises a free radical and a relaxation reagent, the free radical non-selectively enhances NMR signals of the oil phase and the water phase under the dynamic nuclear polarization, and the relaxation reagent selectively enhances relaxation of either the oil phase or the water phase, thereby, suppressing the NMR signals of the oil or water phase with the enhanced relaxation under the dynamic nuclear polarization,
• measuring the NMR signals of the sample under dynamic nuclear polarization, wherein the NMR signals of the sample are similar to or basically same as the NMR signals of either the water phase or the oil phase alone, wherein the water phase or the oil phase does not have the enhanced relaxation by the relaxation reagent,
• analyzing the NMR signals of the sample to obtain characteristics of the water or oil phase in the sample.