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RECOVERY OF LACTOSE FROM AQUEOUS SOLUTIONS: PRECIPITATION WITH CALCIUM CHLORIDE AND SODIUM HYDROXIDE
Author(s) -
OLANO AGUSTIN,
NICKERSON T. A.,
BERNHARD R. A.
Publication year - 1977
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1977.tb08405.x
Subject(s) - chemistry , lactose , aqueous solution , precipitation , reagent , inorganic chemistry , calcium hydroxide , sucrose , alkaline earth metal , acetone , magnesium , calcium , sodium hydroxide , sodium , nuclear chemistry , metal , organic chemistry , physics , meteorology
Comparative studies were made of lactose and sucrose precipitation from aqueous solutions by the formation of carbohydrate‐alkaline earth hydroxide complexes. Lactose can be recovered in the precipitate using lower concentrations of calcium hydroxide than can sucrose. Insoluble complexes with barium were not produced with lactose under conditions that yielded complexes with sucrose. Also studied was the influence of the concentration of reagents, the alkaline‐earth metal employed, and the addition of organic solvents. The ratio of Ca(OH) 2 /lactose in the precipitate depended on the ratio of reactants in the original solution rather than on the absolute concentrations of Ca(OH) 2 and lactose. Addition of organic solvents increased the recovery of lactose. Acetone was more effective than ethanol, methanol being the least effective.