Polyamorphism?

Polyamorphism is defined as the existence of two distinct amorphous states of the same material separated by a clear phase transition. However, this phenomenon is presumably not so relevant for pharmaceuticals. A more pharmaceutical relevant concern is that different isolation and storage conditions can give amorphous samples with significantly different physical properties. Such differences are not strictly polyamorphs but the differences can exist for significant periods of time and must be monitored and characterized thoroughly.

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