The present invention relates to an improved process for the preparation of cefadroxil of the formula (I), more particularly, the present invention relates to an improved process for the preparation of cefadroxil having water content in the range of 4-5%.
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Method for producing crystalline cefadroxil hemihydrate
申请人:Rifar S.R.L.
公开号:US04904776A1
公开(公告)日:1990-02-27
The invention relates to a method for producing crystalline cefadroxil hemihydrate. According to the method a cefadroxil solvate is slurried with a mixture methanol:isopropyl alcohol 30:70 to 70:30 by volume containing from 5% to 12% of water, a temperature from +45.degree. C. to +55.degree. C. and then isolating the so obtained crystalline compound.
The invention relates to a novel crystalline cefadroxyl hemihydrate having a K.F. between about 3.5 and 2.0%: such compound is more stable than other cefadroxyl molecules. The novel cefadroxyl is obtained preparing and isolating a novel cefadroxil solvate of dimethylacetamide, or of N-methyl-2-pyrrolidone or of monomethylformamide, slurrying said solvate with a mixture methanol/isopropyl alcohol 30:70 to 50:50 by volume at a temperature of about +45.degree. C. to +55.degree. C. and then filtering the so obtained compound.
Active agent delivery systems and methods for protecting and administering active agents
申请人:Mickle Travis
公开号:US20070232529A1
公开(公告)日:2007-10-04
The present invention relates to active agent delivery systems and more specifically to compositions that comprise amino acids, as single amino acids or peptides, covalently attached to active agents and methods for administering conjugated active agent compositions.
ACTIVE AGENT DELIVERY SYSTEMS AND METHODS FOR PROTECTING AND ADMINISTERING ACTIVE AGENTS
申请人:Mickle Travis
公开号:US20090253792A1
公开(公告)日:2009-10-08
The present invention relates to active agent delivery systems and more specifically to compositions that comprise amino acids, as single amino acids or peptides, covalently attached to active agents and methods for administering conjugated active agent compositions.