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Why did the rice wine vinegar create more casein-plastic than the distilled white vinegar? Rice wine is least acidic? Answered

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Prfesser (author)2011-10-10

Casein will precipitate from almost any reasonably-acidic solution, but the maximum will be obtained at a particular pH (see "isoelectric point"). If memory serves that pH is around 4 or thereabouts.

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