Figure 8.

Comparison of 60 MHz (benchtop) and 600 MHz (high-field) ¹H NMR spectra obtained from an extract of saffron in DMSO-d6, with annotations of the main features identified in the 60 MHz spectrum. The benchtop spectral profile is dominated by resonances attributed to picrocrocin, a major saffron metabolite, the structure of which is given in the inset panel. The isolated peak at 10.05 ppm is in a generally uncrowded region of the spectrum and provides a useful indicator of the presence of saffron in a sample. Reprinted from [50], with permission from Elsevier, Copyright 2020.