Fig. 6
From: Assessment of geographical origin and production period of royal jelly by NMR metabolomics
PCA score-plot (58.2% of total variance explained) based on 1H NMR spectra of Royal Jelly samples produced by three Italian farms (Bo1, Bo6 and Gr5) on the 13th of June 2016 and deriving from a monofloral production conducted in the presence of either chestnut (orange circles), trifolium (green triangles) or linden (red squares) flowerings. The ellipses were arbitrarily generated to indicatively group the different RJ types. The name and orthogonal direction of most significant loading vectors involved in the differentiation among RJ types are reported along the plot borders (more details are reported in Additional file 1: Fig. S12)