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Stabilizing effect of organic solvents on oxyhemoglobin
N Nedjar-Arroume1, D Guillochon, J M Piot
1Laboratoire de Technologie des Substances Naturelles IUT A, Lille I, Villeneuve d'Ascq, France.
Biotechnology and Applied Biochemistry
|June 1, 1991
Summary
Researchers identified specific solvents that significantly slow down hemoglobin autoxidation, a key challenge for its use in biotechnology and medicine. Glycerol, glycols, and alcohols proved most effective in stabilizing hemoglobin solutions.
Area of Science:
- Biotechnology
- Biochemistry
- Materials Science
Background:
- Hemoglobin solutions are valuable oxygen carriers in biotechnology, for applications like biocatalyst oxygen supply and blood substitute development.
- A major obstacle to hemoglobin's use is the autoxidation of heme iron during preparation, storage, and application.
- Understanding factors influencing hemoglobin stability is crucial for advancing its biotechnological applications.
Purpose of the Study:
- To investigate the impact of various solvents on the autoxidation kinetics of oxyhemoglobin.
- To identify solvents that can stabilize hemoglobin and mitigate heme iron autoxidation.
- To elucidate the mechanisms by which solvents affect hemoglobin stability.
Main Methods:
- Studied the autoxidation kinetics of oxyhemoglobin in 56 different solvents under non-denaturing conditions.
- Classified solvents based on their effect on autoxidation rates (destabilizing, low stabilization, strong stabilization).
- Analyzed solvent properties and their correlation with hemoglobin stabilization, considering globin solvation and hydrophobic interactions.
Main Results:
- 27 out of 56 solvents demonstrated a concentration-dependent reduction in oxyhemoglobin autoxidation rates compared to water.
- Solvents were categorized into three groups based on their stabilizing or destabilizing effects.
- Glycerol, glycols, and alcohols were identified as the most effective stabilizing solvents, with stabilization ratios (k(H2O)/k(solvent)) greater than 20.
Conclusions:
- Specific solvents, particularly glycerol, glycols, and alcohols, can significantly inhibit oxyhemoglobin autoxidation.
- The stabilizing effect of hydroorganic solvents is linked to their influence on water structure and reduced hydrophobic interactions with globin.
- These findings offer a pathway to overcome a critical barrier in the development and application of hemoglobin-based oxygen carriers.