title: The Healing Effect of Licorice on Pseudomonas aeruginosa Infected Burn Wounds in Experimental Rat Model.
abstract: BACKGROUND
  Burn is still one of the most devastating injuries in emergency medicine while improvements in wound healing knowledge and technology have resulted into development of new dressings. This study was undertaken to evaluate the healing effect of licorice in Pseudomonas aeruginosa infected burn wounds of experimental rat model.
  
  
  METHODS
  One hundred and twenty female Sprague-Dawley rats were randomly allocated to 4 equal groups. Group A received silver sulfadiazine ointment, Group B received 10% licorice extract and Group C was considered as control group and received gel base as the base of medication. Group D did not receive any medication and just underwent burn injury. A standard 3rd degree burn wound was produced by a hot plate with similar size about 20% of total body surface area (TBSA) and at identical temperature. After 24 h of burn production, 10(8) colony forming units (CFU) of toxigenic strains of P. aeruginosa (PA 103) were inoculated subcutaneously into the burnt area. After 3, 7, 14, 21 and 28 days of therapy, the animals were sacrificed and burn areas were macroscopically examined and histologically evaluated.
  
  
  RESULTS
  Decrease in size of the burn wounds, in inflammation and re-epithelialization were poor in groups B-D. Infection to P. aeruginosa was still visible in groups B-D but was absent in Group A. The mean histological score, tensile strength, maximum stress, yield strength and stiffness in groups B-D were lower compared with Group A.
  
  
  CONCLUSIONS
  Licorice extract in 10% concentration was shown not to be effective in healing of P. aeruginosa infected burn wounds.
authors.affiliation: Shiraz Burn Research Center, Pharmacology Department, Shiraz University of Medical Sciences, Shiraz, Iran;
authors.forename: Nader
authors.initials: N
authors.lastname: Tanideh
authors.affiliation: Student Research Committee, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran;
authors.forename: Pedram
authors.initials: P
authors.lastname: Rokhsari
authors.affiliation: Stem Cell and Transgenic Technology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran;
authors.forename: Davood
authors.initials: D
authors.lastname: Mehrabani
authors.affiliation: Nano Drug Delivery Research Center, Faculty of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran;
authors.forename: Soleiman
authors.initials: S
authors.lastname: Mohammadi Samani
authors.affiliation: School of Veterinary Medicine, Shiraz University, Shiraz, Iran;
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Sabet Sarvestani
authors.affiliation: Pathology Department, Shiraz University of Medical Sciences, Shiraz, Iran;
authors.forename: Mohammad Javad
authors.initials: MJ
authors.lastname: Ashraf
authors.affiliation: Laboratory Animal Center, Shiraz University of Medical Sciences, Shiraz, Iran;
authors.forename: Omid
authors.initials: O
authors.lastname: Koohi Hosseinabadi
authors.affiliation: Mad Veterinary Clinic, Shiraz, Iran.
authors.forename: Shahram
authors.initials: S
authors.lastname: Shamsian
authors.affiliation: School of Veterinary Medicine, Shiraz University, Shiraz, Iran;
authors.forename: Nasrollah
authors.initials: N
authors.lastname: Ahmadi
keywords: Burn; Healing; Licorice; P. aeruginosa; Silver sulfadiazine; Wound