L-Lactic Acid → Calcium Lactate

Beteiligte Stoffe

Reaktionsschritte

External skeletons of Hemicentrotus pulcherrimus, from which ovaries had been already extracted, were washed with water and dried spontaneously, and then baked in a baking furnace at about 1,100° C. for one hour to give calcium oxide, which was fully hydrated and converted into calcium hydroxide. 1,000 g of thus obtained calcium hydroxide was dissolved in 10 liter of water, about 5,000 g of 50% L-lactic acid was added and reacted at a temperature of 75° C. for 15 min to produce calcium lactate from sea urchin shells. In this case, lactic acid was added in such a little stoichiometrically excessive amount that the pH value of the aqueous solution be at a prescribed value in a range of about 5 to 6 after the reaction, and the reaction process was finished at the time the pH value was settled. To this aqueous solution, 150 g of reducing maltose and about 15 g of chondroitin sulfate composition at 20% purity (ratio of 20% chondroitin sulfate composition to calcium: about 0.5%, ratio of chondroitin sulfate (100%) to calcium: about 0.6%) were added, and dried by a spray-drier to give highly water-soluble particles of 60 μm or less in average diameter which were almost white and had a slightly peculiar taste.

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