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Related Experiment Videos

Horseradish peroxidase activity in a reverse catanionic microemulsion.

Sekh Mahiuddin1, Audrey Renoncourt, Pierre Bauduin

  • 1Material Science Division, Regional Research Laboratory, Jorhat-785 006, Assam, India.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 1, 2005
PubMed
Summary

Enzymatic superactivity was observed in catanionic microemulsions, even with cationic surfactant presence. These findings advance understanding of enzyme behavior in novel surfactant systems.

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Area of Science:

  • Biochemistry
  • Physical Chemistry
  • Colloid Science

Background:

  • Reverse microemulsions are versatile media for enzymatic reactions.
  • Catanionic microemulsions, mixtures of anionic and cationic surfactants, offer unique properties.
  • Understanding enzyme behavior in these systems is crucial for biocatalysis.

Purpose of the Study:

  • To investigate enzymatic activities in a novel catanionic microemulsion.
  • To determine the effect of cationic surfactant (DTAB) on enzyme performance.
  • To explore the influence of pH and co-surfactant (hexanol) on enzymatic activity.

Main Methods:

  • Enzymatic assays were conducted in a catanionic microemulsion system.
  • The system comprised sodium dodecyl sulfate (SDS), dodecyltrimethylammonium bromide (DTAB), n-hexanol, citrate buffer, and n-dodecane.

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  • Variations in surfactant ratios, pH, and hexanol content were systematically studied.

    • Main Results:

    • Enzymatic activities were observed in the catanionic microemulsion.
    • Dodecyltrimethylammonium bromide (DTAB) showed an inhibiting effect on the enzyme.
    • Enzymatic superactivities were achieved even at 15% DTAB to total surfactant ratio (3% weight fraction).
    • pH and hexanol content influenced the observed enzymatic activities.

    Conclusions:

    • Catanionic microemulsions can support enzymatic activity, with potential for superactivity.
    • The cationic surfactant DTAB has an inhibitory effect, but superactivity is still attainable.
    • Optimizing conditions like pH and hexanol content is key for maximizing enzyme performance in these systems.