2.2. Analysis of Red Beetroot Juice Samples by NMR Spectroscopy
All spectra were recorded at 298 K on a JEOL JNM-ECZR (JEOL Ltd., Tokyo, Japan) spectrometer equipped with a magnet that works at 14.09 T and at 600.17 MHz for the Quantities were expressed in mmol/mL through comparison of the relative integrals with the reference concentration and normalized to the number of protons (TSP: 9 protons) and to the starting milliliter of sample. The final concentration was expressed as mg/100 mL.