Preserving compositions containing chitosan and processes for making water soluble O-acetylated chitosan and chitosan
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United States of America Patent
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N/A
Issued Date -
Feb 14, 2002
app pub date -
Apr 19, 2001
filing date -
Apr 21, 2000
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention is directed to a pharmaceutical preserving composition comprising: (a) at least one chitosan or chitosan derivative and (b) at least one buffer solution, as well as methods of preserving contact lens solutions and disinfecting contact lens using such composition. The present invention is further directed to a method of preparing O-acetylated chitosan or chitosan derivatives comprising the steps of dissolving the chitosan or chitosan derivative into an aqueous acidic solution and reacting the chitosan or chitosan derivative with an acetylating agent in the presence of a phase transfer reagent.
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