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Anthocyanin content as function of storage time at different pH buffers; (a,d) pH = 4, (b,e) pH = 7 and (c,f) pH = 10. Samples extracted with ethanol/citric acid (BCS) and ethanol/acetic acid (BCA), samples after resin column (BCSR and BCAR), and microencapsulated samples using TEOS (TBCS, TBCA, TBCSR, TBCAR).
