Production process of high-purity lactulose syrup
Patent 5034064 Issued on July 23, 1991. Estimated Expiration Date: 
August 31, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 31, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesProcess for preparing lactulose from lactose, in the form of a syrup or a crystalline product Patent #: 4536221 InventorsApplicationNo. 401300 filed on 08/31/1989US Classes:127/46.3, For ion exclusion127/46.2Involving ion manipulation, e.g., ion exchange, etc.ExaminersPrimary: Morris, TheodoreAssistant: Brunsman, David Attorney, Agent or FirmInternational ClassC13K 005/00Foreign Application Priority Data1988-09-01 JPAbstractA lactulose syrup suitable for use in the production of foods and drugs is produced by the alkali isomerization of lactose. Elimination of monosaccharides formed in the reaction mixture, such as galactose, is conducted by passing the reaction mixture through a column packed with beads of a strongly-acidic chromatographic cation-exchange resin, said beads having substantially the same crosslinking degree, and then collecting lactulose-containing eluate fractions. This process is suitable for the industrial production of a high-purity lactulose syrup.Other References
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