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Related Experiment Videos

Stroma-free hemoglobin solutions purified by chloroform and pasteurization.

T I Pristoupil1, T Marík, J Suttnar

  • 1Institute of Hematology and Blood Transfusion, Prague, Czechoslovakia.

The International Journal of Artificial Organs
|June 1, 1990
PubMed
Summary

Chloroform treatment offers a stable method for processing stroma-free hemoglobin (SFH) solutions, balancing purification with oxidative stability. Freeze-drying with fructose or sucrose further protects SFH, presenting a viable production compromise.

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Area of Science:

  • Biochemistry
  • Biotechnology
  • Materials Science

Background:

  • Stroma-free hemoglobin (SFH) solutions are potential blood substitutes, but their production requires efficient purification methods.
  • Current methods for processing outdated red blood cells (RBCs) into SFH need evaluation for efficacy, speed, and quality control.
  • Ensuring the stability and minimizing oxidation of SFH during storage and processing is crucial for its application.

Purpose of the Study:

  • To re-evaluate processing methods for native stroma-free hemoglobin (SFH) solutions based on current production and quality standards.
  • To compare the efficacy of chloroform treatment and pasteurization in removing impurities from RBC hemolysates.
  • To assess the impact of these purification methods on the stability and spontaneous methemoglobin formation of SFH during storage, particularly after freeze-drying.

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Main Methods:

  • Evaluated chloroform treatment and pasteurization for processing outdated red blood cells (RBCs) into stroma-free hemoglobin (SFH).
  • Assessed purification efficacy in removing stromata, phospholipids, and non-heme proteins using techniques like SDS-PAGE and isoelectric focusing.
  • Compared the influence of both treatments on spontaneous methemoglobin formation in freeze-dried SFH, with and without cryoprotectants (fructose, sucrose).

Main Results:

  • Pasteurization yielded superior purification and homogeneity but increased susceptibility to oxidation, likely due to heat-inactivated radical scavengers.
  • Chloroform treatment resulted in less purified SFH but demonstrated enhanced stability against oxidation.
  • Both fructose and sucrose effectively protected SFH from oxidation during freeze-drying, showing equal efficacy.

Conclusions:

  • Chloroform treatment presents a technically feasible and rapid method for SFH purification, offering better oxidative stability compared to pasteurization.
  • Pasteurization provides higher purity but compromises SFH stability due to potential inactivation of protective enzymes.
  • Combining chloroform treatment with freeze-drying using fructose or sucrose represents a promising technological compromise for SFH production, warranting further investigation.