The antibacterial effects of Quercus brantii var. persica extracts against Lactococcus garvieae under in vitro condition

Document Type : Disease


1 Departement of Marine Science, Khorramshar University, Khozestan, Iran

2 Department of Aquatic Animal Health, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran

3 Environmental Engineering Islamic Azad University, Science and Research Branch, Yazd, Iran.


The aim of this study was to evaluate the antibacterial effects of inner layer of Oak fruit (Jaft) (Q. brantii) extracts to Lactococcus garvieae. The ethanolic and aqueous extracts of Jaft were obtained by soaking method. Antibacterial studies were performed using disk diffusion and well method. The ethanolic extract had a potent inhibition zone with the diameter of 7.72±0/64 mm in disc diffusion assay. Also, aqueous extract of Jaft showed antibacterial effect against L. garvieae with the inhibition zones of 7.12±0/83 mm in well assay. The minimum inhibitory concentrations (MIC) for the ethanolic and aqueous extracts were 0.75 and 1.5−1, respectively. There was a significant difference (P<0.05) between the anti-bacterial activities of aqueous and ethanolic extracts of Jaft when compared with erythromycin, ampicillin and chloramphenicol. The best anti-bacterial activity was seen by the ethanolic and aqueous extracts, respectively.