Related Experiment Video

Updated: Jul 6, 2026

Evaluation of Antimicrobial Activities of Nanoparticles and Nanostructured Surfaces In Vitro
11:52

Evaluation of Antimicrobial Activities of Nanoparticles and Nanostructured Surfaces In Vitro

Published on: April 21, 2023

Antimicrobial activity of parabens in submicron emulsions stabilized with lecithin

Malgorzata Młynarczyk1, Malgorzata Sznitowska, Dorota Watrobska-Swietlikowska

  • 1Bacteriological Laboratory, Warsaw Pharmaceutical Works POLFA S.A., Warsaw, Poland. msznito@amg.gda.pl

Drug Development and Industrial Pharmacy
|April 11, 2008
PubMed

Insights

Methyl and propylparaben combinations showed poor antimicrobial efficacy in submicron emulsions, failing to meet pharmacopoeial standards. The formulation

Area of Science:

  • Pharmaceutical Sciences
  • Microbiology
  • Formulation Science

Background:

  • Submicron emulsions are increasingly used in pharmaceutical and cosmetic applications.
  • Effective preservation is crucial for the safety and stability of these formulations.
  • Parabens are common preservatives, but their efficacy in complex emulsions needs evaluation.

Purpose of the Study:

  • To investigate the antimicrobial efficacy of a methyl and propylparaben combination in submicron emulsions.
  • To assess the impact of oil and lecithin concentration on preservative effectiveness and microbial growth.
  • To determine if submicron emulsions possess inherent protective or growth-promoting properties against microbes.

Main Methods:

  • Antimicrobial efficacy testing of methyl and propylparaben combinations in submicron emulsions.
  • Evaluation of microbial growth inhibition and multiplication of reference strains.
  • Analysis of the correlation between oil/lecithin ratio and preservative efficacy.

Main Results:

  • Parabens were ineffective at standard and doubled concentrations, failing to meet pharmacopoeial criteria.
  • Submicron emulsions demonstrated protective properties, allowing microbial growth despite preservative presence.
  • No significant correlation was found between the oil/lecithin ratio and paraben efficacy.

Conclusions:

  • The tested paraben combination is not suitable as a preservative for these submicron emulsions.
  • The formulation's composition, particularly lipophilic domains, may hinder preservative activity.
  • Further research is required to develop stable, safe, and effectively preserved submicron emulsion formulations.

More Related Videos

Generation of Greater Bacterial Biofilm Biomass using PCR-Plate Deep Well Microplate Devices10:57

Generation of Greater Bacterial Biofilm Biomass using PCR-Plate Deep Well Microplate Devices

Published on: April 22, 2022

Related Concept Videos

Antimicrobial Effectiveness01:28

Antimicrobial Effectiveness

The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
Surface Membrane Barriers01:18

Surface Membrane Barriers

The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
Surface Active Agents01:27

Surface Active Agents

Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...