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Related Experiment Videos

Stabilized hemoglobin vesicles

E Tsuchida1

  • 1Department of Polymer Chemistry, Waseda University, Tokyo, Japan.

Artificial Cells, Blood Substitutes, and Immobilization Biotechnology
|January 1, 1994
PubMed
Summary
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Haemoglobin-vesicles as artificial oxygen carriers: present situation and future visions.

Journal of internal medicine·2007

Novel hemoglobin (Hb)-vesicles encapsulate concentrated Hb for superior oxygen transport. These biocompatible, stable vesicles offer potential as an artificial oxygen carrier, overcoming limitations of traditional blood substitutes.

Area of Science:

  • Biomaterials Science
  • Biotechnology
  • Nanotechnology

Background:

  • Hemoglobin (Hb)-based oxygen carriers (HBOCs) are explored as blood substitutes.
  • Challenges include Hb toxicity and short circulation times.
  • Developing safe and effective HBOCs with adequate oxygen carrying capacity is crucial.

Purpose of the Study:

  • To develop and characterize Hb-vesicles (HbVs) as advanced oxygen carriers.
  • To optimize oxygen transport properties and storage stability.
  • To evaluate the biocompatibility and functional performance of HbVs.

Main Methods:

  • HbVs prepared by extruding lipid dispersions through 0.2-micron filters.
  • Coencapsulation of Hb (>40 g/dl) and allosteric effectors.
  • Membrane stabilization using polyphospholipid or glycolipid.

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  • Storage stability assessed at 4°C, frozen, and dried states.
  • In vitro testing of oxygen affinity and vasorelaxation.

    • Main Results:

    • HbVs demonstrated high Hb encapsulation (>40 g/dl) and excellent oxygen transport.
    • Satisfying rheological properties (oncotic pressure, viscosity) were achieved.
    • Sterilizable vesicles (<0.2 micron) with enhanced oxygen affinity were produced.
    • Long-term storage stability (4°C, frozen, dried) confirmed without changes.
    • Reduced inhibition of EDRF-mediated vasorelaxation observed.

    Conclusions:

    • Hb-vesicles represent a promising artificial oxygen carrier with superior oxygen transport.
    • Their stability and storage potential (including dried form) are significant advantages.
    • HbVs show improved biocompatibility, with reduced impact on vasorelaxation, making them a viable alternative to traditional blood substitutes.