Crystalline minocycline base and processes for its preparation
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United States of America Patent
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Sep 4, 2012
Grant Date -
Nov 11, 2010
app pub date -
Feb 22, 2008
filing date -
Feb 23, 2007
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Abstract
The invention provides crystalline minocycline base. In particular, three crystalline polymorphic forms, designated Form I, Form II and Form III, of minocycline base are provided. These are characterized by XRD and IR data. Processes for preparing the new polymorphic forms are also provided. For example, Form I is prepared by dissolving and/or suspending amorphous minocycline base in an organic solvent chosen from ethers followed by crystallization from the mixture.
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