Extraction with different concentrations of ethanol (20–100%) had no significant influence on anthocyanin content in frozen BCE (P>0.05) but could significantly affect the antioxidant activities (Pb0.05) of BCE: the reducing power, ABTS•+ scavenging activity up to a maximum at 40% ethanol, and DPPH• scavenging activity up to a maximum at 60% ethanol (which had no significant difference compared with 40% ethanol).