Mass spectrometric scan was performed in positive mode with
a scanning interval 500–1200 m/z. Nebulization was conducted at
350 C aided by concurrent N2 flow at 10 psi; capillary and cone
voltages were set at 3.5 kV and 40 V; drying gas flow rate was
5 L/min. Mass of precursor ions and reactions of fragments loss
were evaluated. Data were analysed using Bruker Hystar Post Processing
software (Bruker, Bremen, Germany). Anthocyanin compounds
were identified by HPLC retention time, absorbance
spectra pattern, and matching MS fragment database according
to previous publications