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Evaluation of the Efficacy of Organic Peroxyacids for Eradicating Dairy Biofilms Using an Approach Combining Static and Dynamic Methods
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Deactivation efficiency of stabilized bactericidal emulsions.

Renata Vyhnalkova1, Adi Eisenberg, Theo G M van de Ven

  • 1Pulp and Paper Research Centre, McGill University, 3420 University Street, Montreal, Québec H3A 2A7, Canada.

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|August 10, 2011
PubMed
Summary

This study developed biocide emulsions using polyethyleneimine (PEI) and poly(caprolactone)-b-poly(acrylic acid) (PCL-b-PAA) for effective bacteria deactivation. Both agents stabilized the emulsions, with PEI showing inherent biocidal activity against E. coli.

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Area of Science:

  • Materials Science
  • Microbiology
  • Chemical Engineering

Background:

  • Biocide emulsions are crucial for controlling bacterial contamination.
  • Effective stabilization of biocide emulsions is essential for sustained release and efficacy.
  • Thiocyanomethylthiobenzothiazole (TCMTB) is a potent biocide requiring optimized delivery systems.

Purpose of the Study:

  • To prepare and characterize biocide emulsions stabilized by polyethyleneimine (PEI) and poly(caprolactone)-b-poly(acrylic acid) (PCL-b-PAA).
  • To evaluate the efficiency of these stabilized emulsions in deactivating Escherichia coli (E. coli).
  • To investigate the release kinetics and structural integrity of the biocide emulsions.

Main Methods:

  • Preparation and characterization of biocide emulsions with varying stabilizing agents.
  • Testing the stabilizing effect of polyethyleneimine (PEI) and PCL(33)-b-PAA(33) on TCMTB emulsions.
  • Assessing bacterial deactivation of E. coli ATCC 11229 using emulsion absorbance measurements.
  • Studying emulsion dissolution kinetics via dialysis and analyzing residual structures with SEM.

Main Results:

  • Emulsion droplet sizes ranged from 325 to 500 nm.
  • PEI-stabilized emulsions showed E. coli deactivation, with PEI itself exhibiting biocidal properties.
  • PCL-b-PAA stabilized emulsions released TCMTB, leading to bacterial deactivation.
  • Biocide release occurred within approximately 250 minutes, leaving insoluble shells.

Conclusions:

  • Both PEI and PCL-b-PAA are effective stabilizing agents for TCMTB biocide emulsions.
  • The choice of stabilizer influences the mechanism of bacterial deactivation (direct PEI action vs. TCMTB release).
  • The developed emulsions demonstrate potential for controlled biocide delivery and bacterial control.