Antibacterial Activity of the Hydro-Alcoholic Extract of Juglans regia L. Stem Bark on Human Bacterial Infection

Document Type : Original Article

Authors

1 Microbiology Department, Veterinary Medicine Faculty, Shahid Chamran University, Ahvaz, Iran

2 Veterinary Medicine Faculty, Shahid Chamran University, Ahvaz, Iran

Abstract

Aims Bovine mastitis continues to be the most costly disease to the dairy farmers. It
dominates in Iran as one of the most prevalent diseases in dairy cattle among the dairy farms.
Mastitis treatment with antibiotics leads to the development of antibiotic resistant strains
and consumer health problem.This study was performed for the first time to analyze in vitro
effects of hydro-alcoholic extract of Juglans regia L. stem bark on 6 mastitis pathogens.
Materials & Methods the susceptibility of 6 strains of bacteria (Staphylococcus aureus,
Escherichia coli, Klebsiella pneumoniae, Streptococcus spp., Pasteurella multocida and
Mannheimia haemolytica) were analyzed against hydro-alcoholic extract of Juglans regia
L. stem bark with minimum inhibitory concentration (MIC) and minimum bactericidal
concentration (MBC) methods.
Findings Hydro-alcoholic extract did not have antibacterial effects on E. coli and K.
pneumoniae. Minimum inhibitory concentration for S. aureus, P. multocida, M. haemolytica
and Streptococcus spp. was 62.5mg/ml of hydro-alcoholic extract. There was not any
significant response with concentrations below 100mg/disc on S. aureus, Streptococcus
species, P. multocida and M. haemolytica. Minimum bactericidal concentration of this extract
was 100mg/ml in all isolates.
Conclusion Juglans regia L. have some antibacterial effects on S. aureus, P. multocida, M.
haemolytica and Streptococcus species.

Keywords