Biofilm prevention by dicephalic cationic surfactants and their interactions with DNA.
OBJECTIVE
The studies were aimed to contribute to the elucidation of the relationships between structure of the double-headed cationic surfactants-N,N-bis[3,3'-(dimethylamine)- propyl]alkylamide dihydrochlorides and N,N-bis[3,3'-(trimethylammonio)propyl]alkylamide dibromides (alkyl: n-C9 H19 , n-C11 H23 , n-C13 H27 , n-C15 H31 ) and their antibacterial and biofilm preventing activity.


RESULTS
The minimal inhibitory and bactericidal concentrations (MIC and MBC) of dicephalic surfactants against Staphylococcus epidermidis and Pseudomonas aeruginosa were tested using standard methods. Pseudomonas aeruginosa was resistant to studied compounds but MBC values against Staph. epidermidis reached 0·48-0·01 mmol l(-1) . The influence of dicephalic surfactants on bacterial biofilm and adhesion to the various surfaces was investigated with crystal violet staining or colony counting. The reduction in bacterial adhesion was observed, especially in the case of glass and stainless steel. The condensation of the DNA was shown in the ethidium bromide intercalation assay.


CONCLUSIONS
Dicephalic surfactants exhibited antibacterial activity against Staph. epidermidis. The activity of studied compounds depended on the hydrocarbon chain length and the counterion. Surfactants deposited on different materials reduced Staph. epidermidis adhesion, dependently on the surfactant structure and the substratum. Dicephalic surfactants showed the ability of DNA compaction.


CONCLUSIONS
This study points the possibility of application of dicephalic surfactants as the surface-coating agents to prevent biofilm formation. These compounds efficiently condensed DNA and are potential candidates for further studies towards the transfection.
Institute of Genetics and Microbiology, University of Wrocław, Wrocław, Poland.
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Piecuch
Department of Organic and Pharmaceutical Technology, Faculty of Chemistry, Wrocław University of Technology, Wrocław, Poland.
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Lamch
Institute of Genetics and Microbiology, University of Wrocław, Wrocław, Poland.
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Paluch
Institute of Genetics and Microbiology, University of Wrocław, Wrocław, Poland.
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Obłąk
Department of Organic and Pharmaceutical Technology, Faculty of Chemistry, Wrocław University of Technology, Wrocław, Poland.
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Wilk
D000577:Amides / Q000737:chemistry / Q000494:pharmacology*; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001422:Bacterial Adhesion / Q000187:drug effects; D018441:Biofilms / Q000187:drug effects*; D004269:DNA, Bacterial / Q000737:chemistry; D005898:Glass; D009690:Nucleic Acid Conformation / Q000187:drug effects; D011137:Polystyrenes; D011550:Pseudomonas aeruginosa / Q000187:drug effects* / Q000502:physiology; D000644:Quaternary Ammonium Compounds / Q000737:chemistry / Q000494:pharmacology*; D012828:Silicones; D013193:Stainless Steel; D013203:Staphylococcal Infections / Q000382:microbiology; D013212:Staphylococcus epidermidis / Q000187:drug effects* / Q000502:physiology; D013501:Surface-Active Agents / Q000494:pharmacology*; D037521:Virulence Factors / Q000378:metabolism
D000577:Amides; D000900:Anti-Bacterial Agents; D004269:DNA, Bacterial; D011137:Polystyrenes; D000644:Quaternary Ammonium Compounds; D012828:Silicones; D013501:Surface-Active Agents; D037521:Virulence Factors; D013193:Stainless Steel
DNA complexation; adhesion; biofilm; dicephalic cationic surfactants; disinfectants