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  • 1UMET, Unité Matériaux et Transformations, CNRS, Univ. Lille, F 59 000 Lille, France.

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|January 31, 2016
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Summary

Mechanical milling can induce amorphous states in pharmaceutical crystals, influencing physical and chemical transformations. This review explores amorphisation conditions, the nature of milled amorphous states, and their impact on material properties.

Keywords:
AmorphousMillingPharmaceuticalsPhase transitionsPolymorphism

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Area of Science:

  • Materials Science
  • Pharmaceutical Science
  • Solid-State Chemistry

Background:

  • Mechanical milling is a key technique for modifying pharmaceutical materials.
  • Understanding the amorphous state is crucial for controlling material properties and performance.
  • Previous research has explored milling-induced transformations, but a comprehensive overview of the amorphous state's role is needed.

Purpose of the Study:

  • To provide an overview of recent advances in understanding the amorphous state in pharmaceutical materials induced by mechanical milling.
  • To address key questions regarding milling-induced amorphisation, its conditions, and its impact on material properties.
  • To establish a conceptual framework for rationalizing milling-induced transformations.

Main Methods:

  • Literature review of recent advances in mechanical milling and amorphous state characterization.
  • Analysis of studies investigating the conditions, nature, and transformations associated with milling-induced amorphous states.
  • Synthesis of findings to address specific questions about amorphisation and its consequences.

Main Results:

  • Milling can indeed amorphise crystalline pharmaceuticals under specific conditions.
  • The amorphous state can mediate crystal-to-crystal transformations and influence chemical stability.
  • Milling amorphous compounds can lead to accelerated aging or rejuvenation, depending on conditions.
  • The nature and recrystallisation behavior of milled amorphous states are complex and material-dependent.

Conclusions:

  • Mechanical milling is a powerful tool for generating amorphous pharmaceutical materials.
  • The amorphous state plays a critical role in physical and chemical transformations during milling.
  • Further research is needed to fully rationalize and conceptualize milling-induced amorphous states for pharmaceutical applications.