Carbonic Acid → Carbonic Acid

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Simultaneous mixing of solution containing a carbonic acid, a hydrogencarbonic acid, or a carbonic acid and a hydrogencarbonic acid (solution A), a solution containing iron (solution B), and a solution of partial hydrolyzates of casein solution (solution C) using hydrolyzates of casein prepared by partial hydrolysis of casein with a protease in advance to give carbonic acid-and/or hydrogencarbonic acid-iron-partial hydrolyzates of casein complex of the present invention. However, the molar concentration of iron ion in solution B is made 1/3 or less of those of a carbonic acid and a hydrogencarbonic acid ions dissolved in a mixed solution of A, B and C, and molar number of partial hydrolyzates of casein in solution C is adjusted to 11/1,000 molar number of iron ion in solution B calculated as casein before partial hydrolysis.

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