Detection of The Antibacterial Activity of Bacteriocin from Local Isolates of Pseudomonas fluorescens Against Gram Positive Bacteria

Abstract

The antibacterial activity of local isolates of Pseudomonas fluorescens (P1and P2) were tested against some pathogenic bacteria, Staphylococcus aureus, S. epidermidis, Streptococcus faecalis, Streptococcus faecium isolated from stool urine and wounds by modified agar block method at 370C for 24 hr. The isolates of P. fluorescens were positive as producer of bacteriocin with a wide inhibition range on growth of gram positive pathogenic bacteria. P1 inhibited the bacterial growth of S. aureus isolates with a range of inhibition zone (12-20) mm. while P2 inhibited the bacterial growth with a range of inhibition zone was (13-22) mm .The range of inhibition zones of S.epidermidis by P1 were (10-18) mm. while the range by P2 was (9-20) mm. The isolate P1 inhibited the growth of all the tested isolates of S. faecalis with a range of inhibition zone between (12-19) mm. The range of inhibition zones of S. faecalis by P2 were (10-18) mm. The bacterial growth of S. faecium isolates were inhibited by P1 with a range of (15-19) mm. and (16-19) mm. with P2. Agar block method was suitable and easy for screening of bacteriocin production from this bacterium.