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Effect of pH of the extraction solvent on the phenolic contents and antioxidant activity of blueberry pomace ethanolic extracts from ultrasound assisted-extraction (50% ethanol, 40 °C/40 min). TPC, TFC, TAC: total phenolic, flavonoid and anthocyanin contents, respectively; DPPH, antioxidant activity by DPPH assay. Means (n = 3 replicates) ± SD. Different letters indicate significant effect (p ≤ 0.05).
