The antioxidant capacity of PSP extracts was measured by the oxygen radical absorbance capacity method (ORAC) and the results expressed in lM Trolox equivalents per mL (lM TE/mL) (Ou, Hampsch-Woodill, & Prior, 2001). Individual anthocyanin glycosides and non-anthocyanin phenolic acids were tentatively characterized by HPLCESI- MSn using a Thermo Finnigan LCQ Deca XP Max ion trap mass spectrometer equipped with an ESI ion source run in positive ionization mode (ThermoFisher, San Jose, CA, USA) according to a previous developed method by Pacheco-palencia, Hawken, and Talcott
(2007).