1 H‐NMR Fingerprinting of Vaccinium vitis‐idaea Flavonol Glycosides

The present study fully interpreted the complex 1 H NMR fingerprints of quercetin (Q) glycosides (QGs) obtained from the berries of V. vitis‐idaea and provided complete and unambiguous signal assignments. QGs were purified by long‐bed gel permeation chromatography and identified by comparison to commercially available compounds using LC‐MS‐IT‐TOF and 1D/2D NMR. Q‐3‐ O ‐β‐glucopyranoside and Q‐3‐ O ‐β‐glucuronopyranoside were revealed in the berries of V. vitis‐idaea for the first time, and the structures of Q‐3‐ O ‐[4″‐(3‐hydroxy‐3‐methylglutaroyl)]‐α‐rhamnopyranoside, Q‐3‐ O ‐α‐rhamnopyranoside, Q‐3‐ O ‐β‐galactopyranoside, Q‐3‐ O ‐a‐arabinofuranoside, Q‐3‐ O ‐b‐xylopyranoside, and Q‐3‐ O ‐a‐arabinopyranoside were unambiguously confirmed.