title: Evaluation of dermal wound healing and in vitro antioxidant efficiency of Bacillus subtilis SPB1 biosurfactant.
abstract: BACKGROUND
  Lipopeptide microbial surfactants are endowed with unique surface properties as well as antimicrobial, anti-wrinkle, moisturizing and free radical scavenging activities. They were introduced safely in dermatological products, as long as they present low cytotoxicity against human cells. The present study was undertaken to evaluate the in vitro antioxidant activities and the wound healing potential of Bacillus subtilis SPB1 lipopeptide biosurfactant on excision wounds induced in experimental rats.
  
  
  RESULTS
  The scavenging effect of Bacillus subtilis SPB1 biosurfactant on 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical at 1mg/mL was 70.4% (IC50=0.55mg/mL). The biosurfactant produced by Bacillus subtilis SPB1 also showed good reducing power and significant effects in terms of the β-carotene test (IC50=2.26mg/mL) when compared to BHA as a reference standard. Moreover, an interesting ferrous ion chelating activity (80.32%) was found for SPB1 biosurfactant at 1mg/mL. Furthermore, the topical application of Bacillus subtilis SPB1 biosurfactant based gel on the wound site in a rat model every two days, increased significantly the percentage of wound closure over a period of 13days, when compared to the untreated and CICAFLORA™-treated groups. Wound healing effect of SPB1 biosurfactant based gel was confirmed by histological study. Biopsies treated with SPB1 lipopeptides showed wholly re-epithelialized wound with a perfect epidermal regeneration.
  
  
  CONCLUSIONS
  The present study provides justification for the use of Bacillus subtilis SPB1 lipopeptide biosurfactant based gel for the treatment of normal and complicated wounds as well as skin diseases.
authors.affiliation: Enzymes and Bioconversion Research Unit, Department of biological engineering, National School of Engineers of Sfax (ENIS), BP W, 3038 Sfax, Tunisia; Higher Institute of Biotechnology of Sfax (ISBS), BP 261, 3000 Sfax, Tunisia.
authors.forename: Raida
authors.initials: R
authors.lastname: Zouari
authors.affiliation: Laboratory of Pharmacology, Faculty of Medicine of Sfax, 3028 Sfax, Tunisia.
authors.forename: Dorsaf
authors.initials: D
authors.lastname: Moalla-Rekik
authors.affiliation: Laboratory of Pharmacology, Faculty of Medicine of Sfax, 3028 Sfax, Tunisia.
authors.forename: Zouheir
authors.initials: Z
authors.lastname: Sahnoun
authors.affiliation: Laboratory of Histology Embryology and Reproductive Biology, Faculty of Medicine of Sfax, 3028 Sfax, Tunisia.
authors.forename: Tarek
authors.initials: T
authors.lastname: Rebai
authors.affiliation: Enzymes and Bioconversion Research Unit, Department of biological engineering, National School of Engineers of Sfax (ENIS), BP W, 3038 Sfax, Tunisia.
authors.forename: Semia
authors.initials: S
authors.lastname: Ellouze-Chaabouni
authors.affiliation: Enzymes and Bioconversion Research Unit, Department of biological engineering, National School of Engineers of Sfax (ENIS), BP W, 3038 Sfax, Tunisia; Higher Institute of Biotechnology of Sfax (ISBS), BP 261, 3000 Sfax, Tunisia. Electronic address: dhouhag@yahoo.fr.
authors.forename: Dhouha
authors.initials: D
authors.lastname: Ghribi-Aydi
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D001412:Bacillus subtilis / Q000737:chemistry*; D001672:Biocompatible Materials / Q000494:pharmacology*; D001713:Biphenyl Compounds / Q000737:chemistry; D004848:Epithelium / Q000187:drug effects / Q000473:pathology; D005260:Female; D016166:Free Radical Scavengers / Q000494:pharmacology; D006487:Hemostasis / Q000187:drug effects; D007501:Iron / Q000378:metabolism; D007502:Iron Chelating Agents / Q000494:pharmacology; D016014:Linear Models; D055666:Lipopeptides / Q000494:pharmacology; D010084:Oxidation-Reduction; D010851:Picrates / Q000737:chemistry; D017208:Rats, Wistar; D012867:Skin / Q000187:drug effects / Q000473:pathology*; D013501:Surface-Active Agents / Q000494:pharmacology*; D014945:Wound Healing / Q000187:drug effects*; D019207:beta Carotene / Q000378:metabolism
chemical_list: D000975:Antioxidants; D001672:Biocompatible Materials; D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D007502:Iron Chelating Agents; D055666:Lipopeptides; D010851:Picrates; D013501:Surface-Active Agents; D019207:beta Carotene; C004931:1,1-diphenyl-2-picrylhydrazyl; D007501:Iron
keywords: Antioxidant activity; Bacillus subtilis; Biosurfactant; Lipopeptides; Wound-healing efficiency