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Two anthocyanin extracts from purple sweet potato (PSP) were prepared by means of microwave baking (MB) and acidified electrolysed water (AEW) or 95% ethanol. The extraction yield in AEW (pH 3.0) was up to 35.0% nearly 2.5 times higher than in ethanol. When pH ≤ 3.0, the lower the pH values of the extracts in solution were, the darker the red extracts were. Total flavonoids, phenolic and monomeric...
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