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pH-mediated degradation of delphinidin: in low pH, 1–2 red colored flavylium cations are observed, in alkaline pH 8–10 blue-color quinonoidal bases, in pH 4–6 colorless carbinol pseudobase and chalcone, and in pH > 7, degradation products of delphinidin, 2,4,6-trihydroxybenzaldehyde and gallic acid, are observed (45, 46).
