Compound identification is possible using NMR spectra. This might be a straightforward peak comparison or it can include extra tests related to peak splitting and integral intensities depending on the level of specificity required. Here, we demonstrate a technique for identifying ascorbic acid, a common vitamin found in many dietary supplements as well as on its own.

Because neither test provides the necessary specificity on its own, the United States Pharmacopeia method for ascorbic acid identification uses both FT-IR and a chemical test using reducing sugar. In order to swiftly identify ascorbic acid, a single NMR spectrum is acquired and examined using three separate tests: peaks, multiple, and nuclides count comparisons. For sodium ascorbate, the same battery of tests is applied.