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Journal of Dairy Science Vol. 43 No. 9 1216-1223
© 1960 by American Dairy Science Association ®
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Methanol-Soluble Complexes of Lactose and of Other Carbohydrates

K. B. Domovs and E. H. Freund

Research and Development Division, National Dairy Products Corp., Oakdale, Long Island, New York

ABSTRACT

Lactose, sucrose, maltose, galactose, fructose, and many other carbohydrates and derivatives are found highly soluble in cold absolute methanol containing sufficient calcium chloride. From a highly concentrated viscous solution prepared from lactose, calcium chloride, and methanol in a molar ratio such as 1:3:24, a complex of ß-lactose, calcium chloride, and methanol in the molar ratio of 1:1:4 slowly crystallizes. After about 6 M of water are added to such a concentrated solution per mole of calcium chloride, a complex of {alpha}-lactose, calcium chloride, and water in the molar ratio 1:1:7 soon crystallizes. The equilibrium ratio of {alpha}- to ß-lactose in the concentrated solutions is about 5:3. The dilution of such a concentrated solution with methanol causes lactose to crystallize in the same anomeric ratio as exists in the solution. Within the investigated range, the logarithm of the solubility of this crystallized lactose in methanol is a linear function of the calcium chloride concentration.




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