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Second-generation perfluorocarbon emulsion blood substitutes.

K C Lowe1

  • 1School of Biological Sciences (Life Science), University of Nottingham, U.K.

Artificial Cells, Blood Substitutes, and Immobilization Biotechnology
|February 17, 2000
PubMed
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Novel perfluorocarbon (PFC) emulsions show promise as temporary blood substitutes. These injectable PFCs demonstrated anti-inflammatory and anti-thrombotic potential in preliminary studies.

Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Medical Chemistry

Background:

  • Perfluorocarbon (PFC) emulsions are investigated as temporary blood substitutes due to their oxygen-carrying capacity.
  • Developing stable and effective PFC emulsions requires careful selection of stabilizing agents.
  • Existing PFC formulations face challenges in long-term stability and potential biological interactions.

Purpose of the Study:

  • To synthesize and evaluate novel perfluorocarbon emulsions for use as injectable, temporary respiratory gas carriers.
  • To assess the stability and physical characteristics of PFC emulsions stabilized with lecithin and novel fluorinated surfactants.
  • To investigate the in vitro biological effects of these PFC emulsions, including anti-inflammatory and anti-thrombotic properties.

Main Methods:

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  • PFC emulsions were prepared using perfluorodecalin (C10F18) stabilized with lecithin and other agents like perfluorodimorpholinopropane or novel amphiphilic fluorinated surfactants (e.g., compound P6).
  • Emulsion stability was assessed over time (>300 days at 25°C).
  • In vivo studies involved injecting rats to evaluate effects on liver and spleen weights.
  • In vitro assays examined the inhibition of human polymorphonuclear leucocyte (PMNL) chemiluminescence and spontaneous platelet aggregation.

Main Results:

  • Emulsions were steam sterilisable and exhibited stability for over 300 days.
  • Rat injections (7.5 ml/kg) caused transient increases in liver and spleen weights (P < 0.05).
  • One emulsion formulation suppressed PMA-stimulated PMNL chemiluminescence, indicating potential anti-inflammatory effects.
  • The P6 fluoro-surfactant inhibited spontaneous platelet aggregation in human blood, suggesting anti-thrombotic activity.

Conclusions:

  • Novel PFC emulsions stabilized with lecithin and specific fluorinated surfactants demonstrate good stability and potential for biomedical applications.
  • These PFC emulsions exhibit promising anti-inflammatory and anti-thrombotic properties, warranting further investigation for therapeutic use.
  • The findings suggest potential applications as temporary respiratory gas carriers, in managing inflammation in ischemic tissues, and as anti-thrombotic agents.