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HPLC chromatogram (regime 2) of dried quercetin oxidation products (initial compound with tR 25.68 min is absent). Component with tR 4.15 min – phloroglucinol; 4.890 min – 2,4,6-trihydroxybenzoic acid; 6.05 min – 3,4-dihydroxybenzoic acid; 12.02 – intermediate depside (2); 20.97 min – unidentified compounds. Each peak is 100 % pure as there is no co-elution of compounds.
