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Related Experiment Videos

[Inactivation of soman by beta-cyclodextrin].

S Saint-André, B Désiré

    Comptes Rendus De L'Academie Des Sciences. Serie III, Sciences De La Vie
    |January 1, 1985
    PubMed
    Summary

    Beta-cyclodextrin (beta-CD) effectively inactivates the nerve agent soman (pinacolyl methylphosphonofluoridate) by forming a complex. This beta-CD mediated inactivation is significantly faster than natural hydrolysis.

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    Area of Science:

    • Biochemistry
    • Chemical kinetics
    • Toxicology

    Context:

    • Soman (pinacolyl methylphosphonofluoridate) is a potent nerve agent.
    • Beta-cyclodextrin (beta-CD) is a cyclic oligosaccharide with a hydrophobic cavity.
    • Understanding soman inactivation mechanisms is crucial for developing countermeasures.

    Purpose:

    • To investigate the inactivation rate and mechanism of soman by beta-cyclodextrin.
    • To determine the binding affinity and reaction kinetics of the soman-beta-CD complex.
    • To assess the stereospecificity of soman inactivation by beta-CD.

    Summary:

    • Beta-cyclodextrin (beta-CD) significantly inactivates soman (pinacolyl methylphosphonofluoridate) in Tris buffer at pH 7.40 and 25°C.
    • The dissociation constant (Kd) is 0.53 mM and the rate constant (k2) is 5.9 x 10⁻² min⁻¹, indicating a 2,600-fold faster inactivation than hydroxide hydrolysis.
    • Inactivation is stereospecific, with P(-) isomers reacting faster than P(+) isomers, and proceeds similarly in human plasma.

    Impact:

    • Beta-cyclodextrin demonstrates a highly efficient and stereospecific mechanism for soman inactivation.
    • The findings suggest potential applications of beta-CD or its derivatives in soman detoxification strategies.
    • This research provides valuable kinetic and mechanistic insights into the interaction between cyclodextrins and organophosphorus compounds.

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