Anthocyanin identification was performed on an Acquity ultraperformance
liquid chromatography (UPLC) system coupled with a
quadrupole-time of flight (Q-TOF) MS instrument (UPLC/Synapt QTOF
MS, Waters Corp., Milford, MA, USA) with an electrospray ionisation
source (ESI). Separation was achieved on a Acquity™ BEH
C18 column (100 2.1 mm i.d., 1.7 lm; Waters).