Decontamination of collagen biomatrices with combined pulsed electric field and nisin treatment

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Abstract

Pulsed electric field (PEF) treatment has been proposed as a decontamination method for labile matrices used in tissue engineering applications. Through the application of PEF, a non-thermal treatment that causes bacterial inactivation through the irreversible rupture of microbial cell membranes, inactivation is achieved without loss of scaffold structure and function. However, some microorganisms are less susceptible to PEF treatment. This study shows that treatment with PEF and nisin, a food preservative bacteriocin, has a synergistic effect on the inactivation of Staphylococcus epidermidis in collagen gels. Almost complete inactivation of a 103–104 CFU/mL S. epidermidis population was achieved when treated with a combination of PEF and 500 IU/mL nisin, with results demonstrating a 3.4 log10 reduction, compared with 0.66 log10 reduction with PEF alone. Nisin, at concentrations up to 3000 IU/mL, had no discernable toxicity to mammalian 3T3 cells when added to the culture medium or incorporated into the collagen gels. This combined decontamination method, involving PEF plus nisin, may provide a non-destructive process for inactivation of PEF-resistant bacteria in labile tissue engineering scaffolds.
Original languageEnglish
Pages (from-to)287-293
Number of pages7
JournalJournal of Biomedical Materials Research Part B: Applied Biomaterials
Volume96B
Issue number2
Early online date10 Dec 2010
DOIs
Publication statusPublished - Feb 2011

Keywords

  • tissue engineering scaffolds
  • bacterial inactivation
  • pulsed electric fields
  • nisin
  • collagen gels

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