Glucosamine sulfate metal chloride compositions and process of preparing same
US5902801A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1998 |
| Grant date | May 11, 1999 |
| Priority date | — |
| Expiry date | Nov 13, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07H5/10
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Glucosamine compositions comprising the compounds glucosamine sulfate metal chloride, wherein the metal, i.e. the cation, is lithium, sodium, magnesium, zinc or manganese. The compounds have purity levels of at least about 97%, with water present in a maximum amount of about 10 wt. %, based on the weight of the composition. The compounds are prepared by contacting glucosamine hydrochloride with the metal sulfate in the presence of water to form an aqueous solution of glucosamine sulfate metal chloride and thereafter freeze-drying the solution at a temperature and at a reduced pressure for such period of time that at least about 90 wt. % of the water is removed and decomposition of the compound glucosamine sulfate metal chloride is limited to a maximum of about 3%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.