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Related Experiment Videos

Elastic modulus measurements from individual lactose particles using atomic force microscopy.

Mark Perkins1, Stephen J Ebbens, Simon Hayes

  • 1Molecular Profiles Ltd., 8 Orchard Place, Nottingham Business Park, Nottingham NG8 6PX, UK.

International Journal of Pharmaceutics
|November 1, 2006
PubMed
Summary
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Atomic force microscopy (AFM) accurately measures the elastic modulus of single lactose crystals. This non-destructive technique reveals changes in amorphous lactose under pressure, suggesting a phase transition.

Area of Science:

  • Pharmaceutical Science
  • Materials Science
  • Solid-State Chemistry

Background:

  • The elastic modulus of pharmaceutical materials is critical for drug processes and formulation performance.
  • Current assessment relies on bulk methods like beam bending, which have limitations.

Purpose of the Study:

  • To accurately measure the elastic modulus of alpha monohydrate lactose single crystals using atomic force microscopy (AFM).
  • To establish criteria for elastic limit determination and Hertzian modeling.
  • To investigate the elastic response of amorphous lactose and potential pressure-induced phase transitions.

Main Methods:

  • Accurate measurement of elastic modulus on the (011) face of alpha monohydrate lactose single crystals via AFM.
  • Establishment of criteria for elastic limit and Hertzian modeling.

Related Experiment Videos

  • Comparison of AFM with bulk indentation techniques (Berkovich indenter).
  • Study of amorphous lactose's elastic response under repeated loading using AFM.

    • Main Results:

    • The elastic modulus of alpha monohydrate lactose single crystals was measured as 3.45+/-0.90 GPa.
    • Criteria for elastic limit and Hertzian modeling were successfully established.
    • Amorphous lactose exhibited changes in its physical state under repeated loading, behaving more crystalline.
    • A pressure-induced phase transition in amorphous lactose is suggested.

    Conclusions:

    • AFM provides a precise, non-destructive method for measuring the elastic modulus of pharmaceutical materials at the single-particle level.
    • The AFM approach requires minimal sample, avoids compact formation, and detects property variations.
    • Findings suggest amorphous lactose may undergo a pressure-induced phase transition, impacting its material properties.