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Related Experiment Videos

Three structural roles for water in bone observed by solid-state NMR.

Erin E Wilson1, Ayorinde Awonusi, Michael D Morris

  • 1Department of Chemistry, University of Michigan, Ann Arbor, USA.

Biophysical Journal
|February 28, 2006
PubMed
Summary

This study reveals bound water and hydroxide ions within bone mineral using solid-state NMR. These findings clarify bone structure and mineral-organic interactions, crucial for understanding bone health.

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Area of Science:

  • Biomineralization
  • Solid-state NMR Spectroscopy
  • Bone Physiology

Background:

  • Bone is a composite material primarily composed of hydroxyapatite mineral and an organic matrix.
  • Understanding the precise structure and chemical environment of bone mineral is critical for comprehending bone's mechanical properties and pathological changes.
  • The role of structurally bound water and specific ions within the bone mineral matrix remains an area of active investigation.

Purpose of the Study:

  • To investigate hydrogen-bearing species within the bone mineral environment.
  • To elucidate the structural roles of bound water and hydroxide ions in bone mineral.
  • To explore the interactions between bone mineral and the organic matrix.

Main Methods:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy was employed.

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  • Techniques included magic-angle spinning (MAS) and cross-polarization (CP).
  • Heteronuclear correlation experiments ((1)H-(31)P) were utilized for detailed structural analysis.

    • Main Results:

    • Three types of structurally bound water were identified in bone mineral, carbonated apatite, and deproteinated bone.
    • Two water types stabilize defect sites within the apatite crystal lattice.
    • A third water type at the mineral surface suggests a role in mineral-organic interactions; hydroxide ions were confirmed in both unmodified and deproteinated bone, participating in hydrogen bonding.

    Conclusions:

    • Bound water molecules and hydroxide ions are integral components of the bone mineral matrix.
    • These species play significant roles in stabilizing the mineral structure and mediating interactions with the organic components of bone.
    • Solid-state NMR provides powerful insights into the complex chemistry of bone.