发明名称 |
Polymorphic forms α, &bgr; and γ of rifaximin |
摘要 |
Crystalline polymorphous forms of rifaximin (INN) antibiotic named rifaximin α and rifaximin &bgr;, and a poorly crystalline form named rifaximin γ, useful in the production of medicinal preparations containing rifaximin for oral and topical use and obtained by means of a crystallization carried out by hot-dissolving the raw rifaximin in ethyl alcohol and by causing the crystallization of the product by addition of water at a determinate temperature and for a determinate period of time, followed by a drying carried out under controlled conditions until reaching a settled water content in the end product, are the object of the invention.
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申请公布号 |
US8158781(B2) |
申请公布日期 |
2012.04.17 |
申请号 |
US201113041332 |
申请日期 |
2011.03.04 |
申请人 |
VISCOMI GIUSEPPE CLAUDIO;CAMPANA MANUELA;BRAGA DARIO;CONFORTINI DONATELLA;CANNATA VINCENZO;RIGHI PAOLO;ROSINI GOFFREDO;ALFA WASSERMANN, S.P.A. |
发明人 |
VISCOMI GIUSEPPE CLAUDIO;CAMPANA MANUELA;BRAGA DARIO;CONFORTINI DONATELLA;CANNATA VINCENZO;RIGHI PAOLO;ROSINI GOFFREDO |
分类号 |
C07D498/22 |
主分类号 |
C07D498/22 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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