Process for hydrolyzing lactose with immobilized lactose
AssigneeCorning Glass Works
InventorsJean-Luc A. G. Baret, Luc A. Dohan
Life of this patent
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Abstract
Lactose in whey is hydrolyzed with an immobilized lactase by a process which involves heating the whey to a temperature of from about 45.degree. to about 90.degree. C. for at least about 15 seconds, centrifuging the heated whey while it is still warm, contacting the centrifuged whey with an immobilized lactase, cleaning the immobilized lactase, and disinfecting the immobilized lactase. Preferably, lactase is immobilized on an inorganic support, and cleaning and disinfecting are carried out respectively by contacting the immobilized lactase with a solution of protease and with a solution of substituted diethylenetriamine.
Claims14
A process for treating whey whereby at least a portion of the lactose contained therein is hydrolyzed into glucose and galactose by means of an immobilized lactase, which process comprises the steps of:
- A. heating the whey to a temperature of from about 45.degree. to about 90.degree. C. for at least about 15 seconds;
- B. centrifuging the heated whey while it is still warm;
- C. contacting the centrifuged whey with an immobilized lactase under conditions sufficient to hydrolyze at least a portion of the lactose contained therein into glucose and galatose;
- D. cleaning the immobilized lactase by contacting the immobilized lactase with a solution of a protease which removes protein coating the immobilized lactase without significant deleterious effects on the enzymatic activity of the immobilized lactase;
- and
- E. disinfecting the immobilized lactase by contacting the immobilized lactase with a disinfecting solution which substantially kills the contaminating microorganisms without significant deleterious effects on the immobilized lactase;
- wherein the lactase is immobilized on an inorganic support.
A process for treating acid whey whereby at least a portion of the lactose contained therein is hydrolyzed into glucose and galactose by means of an immobilized lactase, which process comprises the steps of:
- A. clarifying the whey;
- B. heating the whey to a temperature of from about 45.degree. to about 90.degree. C. for at least about 15 seconds;
- C. contacting the heated whey with an immobilized lactase under conditions sufficient to hydrolyze at least a portion of the lactose contained therein into glucose and galactose;
- D. cleaning the immobilized lactase by contacting the immobilized lactase with a solution of a protease which removes protein coating the immobilized lactase without significant deleterious effects on the enzymatic activity of the immobilized lactase;
- and
- E. disinfecting the immobilized lactase by contacting the immobilized lactase with a disinfecting solution which substantially kills the contaminating microorganisms without significant deleterious effects on the immobilized lactase;
- wherein the lactase is immobilized on an inorganic support.
A process for cleaning an immobilized lactase having whey protein deposited thereon, which process comprises contacting the immobilized lactase with a solution of a protease which removes the whey protein coating the immobilized lactase without significant deleterious effects on the enzymatic activity of the immobilized lactase, wherein the lactase is immobilized on an inorganic support.
Dependencies are inferred from the claim text.