title: Inhibition of sodium hypochlorite antimicrobial activity in the presence of bovine serum albumin.
abstract: BACKGROUND
  This study investigated the inhibition of the antimicrobial activity of sodium hypochlorite (NaOCl) by bovine serum albumin (BSA). The killing of Enterococcus faecalis, Candida albicans, Staphylococcus epidermidis, and Escherichia coli by NaOCl in concentrations from 2% to 0.03% was measured in the presence of BSA in concentrations between 6.7% and 0.1%.
  
  
  METHODS
  NaOCl, BSA, and microorganism suspensions were mixed, and, after 30 seconds, 6 minutes, and 30 minutes, samples were taken and NaOCl was inactivated by 5% sodium thiosulphate. The microbes were incubated in tryptic soy broth broth for up to 7 days for the detection of growth.
  
  
  RESULTS
  All microorganisms were killed within 30 seconds by 0.03% NaOCl when BSA was not present. High concentrations of BSA significantly reduced the antimicrobial activity of NaOCl against the four species.
  
  
  CONCLUSIONS
  The inhibition of sodium hypochlorite by BSA was directly dependent on their quantitative relationships. The result partly explains the poorer performance in vivo of NaOCl as compared to in vitro experiments.
authors.affiliation: Division of Endodontics, Department of Semiology and Clinics, Faculty of Dentistry, Federal University of Pelotas, Pelotas, Brazil. ferpappen@yahoo.com.br
authors.forename: Fernanda Geraldes
authors.initials: FG
authors.lastname: Pappen
authors.forename: Wei
authors.initials: W
authors.lastname: Qian
authors.forename: Jolanta
authors.initials: J
authors.lastname: Aleksejūniene
authors.forename: Renato de Toledo
authors.initials: Rde T
authors.lastname: Leonardo
authors.forename: Mario Roberto
authors.initials: MR
authors.lastname: Leonardo
authors.forename: Markus
authors.initials: M
authors.lastname: Haapasalo
mesh_terms: D000818:Animals; D000891:Anti-Infective Agents, Local / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects; D002417:Cattle; D004202:Disinfectants / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D008826:Microbial Sensitivity Tests / Q000379:methods*; D012388:Root Canal Irrigants / Q000494:pharmacology; D012710:Serum Albumin, Bovine / Q000494:pharmacology*; D012973:Sodium Hypochlorite / Q000494:pharmacology*
chemical_list: D000891:Anti-Infective Agents, Local; D004202:Disinfectants; D012388:Root Canal Irrigants; D012710:Serum Albumin, Bovine; D012973:Sodium Hypochlorite