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Decrease in toxic potential of mixed tensides maintained below the critical micelle concentration: an in vitro study.

L Benassi1, G Bertazzoni, C Magnoni

  • 1Department of Dermatology, University of Modena and Reggio Emilia, Modena, Italy. benassi.luisa@unimo.it

Skin Pharmacology and Applied Skin Physiology
|April 5, 2003
PubMed
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Sodium lauryl sulphate (SLS) can cause skin irritation. Combining SLS with other tensides significantly reduces its cytotoxic effect on human keratinocytes, even at low concentrations.

Area of Science:

  • Dermatology
  • Toxicology
  • Biochemistry

Background:

  • Sodium lauryl sulphate (SLS) is a common anionic surfactant in topical products.
  • SLS can induce skin irritation and barrier damage.
  • Combining SLS with other surfactants can mitigate its adverse effects.

Purpose of the Study:

  • To investigate the reduction of SLS cytotoxicity by co-surfactants.
  • To evaluate the effect of surfactant combinations below critical micelle concentration (CMC).

Main Methods:

  • Normal human keratinocytes cultured in serum-free medium.
  • Treatment with SLS (0.0025%) combined with cocamidopropyl betaine, Tween 20, or Tween 80.
  • Cytotoxicity assessed via (3)H-thymidine incorporation, MTT assay, and neutral red uptake.

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Main Results:

  • All tested tensides significantly reduced SLS-induced cytotoxicity.
  • Cytotoxicity reduction was observed even at concentrations below the CMC.
  • Conductimetric assays explored the mechanism of toxicity reduction.

Conclusions:

  • Combinations of SLS with specific tensides mitigate its cytotoxic effects on keratinocytes.
  • This protective effect is achievable at sub-CMC concentrations.
  • Understanding surfactant interactions is key to developing safer topical formulations.