4-methylumbelliferone, hesperidin, rutin, hesperidin methylchalcone, isoquercetin, resorcinol, phloroglucinol, methanol, ethanol, butanol, n-propanol, isopropanol, isoamyl alcohol, 2-phenylethanol, p-Nitrophenyl-β-d -glucopyranoside and p-Nitrophenyl-α-l -rhamnopyranoside were purchased in Sigma Chemical (Sigma, St. Louis, MO, USA). Narcissin, tulipanin and myrtillin were purchased in Extrasynthese company (Extrasynthese, Genay Cedex, France). HPLC-grade methanol (LiChrosolv®) was obtained from Merck (Merck, Darmstadt, Germany). The 4-methylumbelliferyl-rutinoside reagent was synthesized as described in Mazzaferro et al. [29 (link)].
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