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Related Experiment Videos

Bond cleavage reactions in solid aqueous carbohydrate solutions

L Streefland1, A D Auffret, F Franks

  • 1Pafra Biopreservation, Cambridge, UK.

Pharmaceutical Research
|July 1, 1998
PubMed
Summary

Chemical reactions occur in water-soluble glasses below their glass transition temperatures (Tg), but at significantly reduced rates. The stability of these glassy matrices varies, impacting the long-term storage of therapeutic agents.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Biotechnology

Background:

  • Water-soluble glasses are increasingly used as matrices for stabilizing therapeutic agents.
  • Understanding chemical reactivity within these glassy states is crucial for drug formulation and storage.

Purpose of the Study:

  • To investigate the chemical reactivity of molecules within water-soluble glasses below their glass transition temperatures (Tg).
  • To determine the influence of different glassy matrices on reaction kinetics and stability.

Main Methods:

  • Measured reaction rates of peptide bond cleavage and unimolecular dissociation in freeze-dried and freeze-concentrated carbohydrate solutions above and below Tg.
  • Utilized ninhydrin-based reactions and spectrophotometric detection to monitor product formation.

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Main Results:

  • Chemical reactions proceed at reduced rates in glassy matrices below Tg.
  • No significant rate enhancement was observed near Tg.
  • Different excipients (e.g., sucrose, Ficoll, dextran) conferred varying degrees of stability, likely due to matrix density and reactant mobility.

Conclusions:

  • Glassy matrices below Tg do not guarantee indefinite stability for therapeutic agents.
  • The choice of excipient significantly impacts the stabilization properties and should be considered in product formulation.