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Related Experiment Videos

Solid-state properties and crystal structure of gliclazide

C S Winters1, L Shields, P Timmins

  • 1Department of Pharmacy, University of Bradford, West Yorkshire, U.K.

Journal of Pharmaceutical Sciences
|March 1, 1994
PubMed
Summary

This study characterizes gliclazide, an antidiabetic drug, revealing its crystal structure and a unique calcium complex formation. This complex is crucial for insulin secretion by pancreatic beta cells.

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Area of Science:

  • Pharmaceutical Sciences
  • Solid-State Chemistry
  • Structural Biology

Background:

  • Gliclazide is a widely used oral hypoglycemic agent.
  • No prior analytical standard or detailed solid-state characterization existed for gliclazide.
  • Understanding its solid-state properties is crucial for drug formulation and efficacy.

Purpose of the Study:

  • To perform comprehensive solid-state characterization of gliclazide.
  • To determine the crystal and molecular structure of gliclazide.
  • To elucidate the mechanism of calcium complex formation relevant to insulin secretion.

Main Methods:

  • Single-crystal X-ray diffraction was employed for structural determination.
  • Extensive structural and physical analytical examinations were conducted.

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  • Conformational analysis was performed to understand molecular articulation.

    • Main Results:

    • Gliclazide crystallizes in the monoclinic space group P2(1)/n.
    • Unit cell dimensions: a = 10.828(2) Å, b = 14.342(19) Å, c = 11.005(6) Å, β = 106.97(2)°.
    • A novel gliclazide:calcium complex was identified, involving two gliclazide molecules and one calcium atom, facilitating calcium ion transport.

    Conclusions:

    • The study provides the first detailed solid-state characterization and crystal structure of gliclazide.
    • The identified gliclazide:calcium complex adopts an extended conformation essential for its function.
    • This structural insight is vital for understanding gliclazide's role in stimulating insulin secretion.