Fig. 4

a HPLC–DAD (extracted at 450 nm) of the extracts of all the red threads of the sample set (all chromatograms are presented in the same scale, and stacked for the sake of clarity); b HPLC-ESI-Q-ToF extracted ion chromatograms (EIC) of anthraquinones (C15H8O7, C15H8O6, C15H10O5, C14H8O4, C14H8O5, C15H10O4) from the extracts of sample MNAAHP-009. Negative acquisition mode