Fig. 1From: Assessment of geographical origin and production period of royal jelly by NMR metabolomics1H NMR spectrum of a representative Royal Jelly sample. a–d The enlarged and magnified spectral regions within the chemical-shift ranges of 0.8–3.1, 3.15–4.75, 5.15–5.95 (×3 magnification) and 5.95–8.65 (×20 magnification) ppm, respectively. The figure reports the assignment of the most intense signals. The labels 10-HDA, URI, NIC, GUA and ADE refer to 10-hydroxy-2-decenoic acid and uridinic-, nicotinamidic-, guanosinic- and adenosinic-like structures, respectivelyBack to article page