التحري عن إنتاج البكتريوسين و تحفيز إنتاجه بوساطة مستخلص نبات Brassica rapa

الملخص EN

The present study aimed to try to find natural substances stimulate the production of bacteriocin, as well as "for detection of bacteriocin producing isolates.

Two hundred and eighty ( 280) bacterial isolates, gram negative only, were collected from 760 different pathogenic samples, consist : (Urinary tract infection, septicemia, Vaginal inflammation and diarrhea).

The isolated bacteria are : Escherichia coli, Klebsiella pneumonia Pseudomonas aeruginosa,, Salmonella typhi, Enterobacter cloacae, Acinetobacter baumannii, Serratia liquefaciens, Citrobacter freundii, Proteus mirabilis and Serrattia odorifera.

Cup assay method was used to detect bacteriocin production.

Locally media prepared ( Nutriernt agar + Brassica rapa roots extract ) to detect bacterial bacteriocin production, compared with ( N.

agar ) only.

The results showed, the percentage of bacteria production of bacteriocin were (28.57 %) / (80) isolates only on N.

agar, while the ratio reached to (82.5 %)/ (231) isolates by local media.Also this media gave (45 mm) in dimeter of inhibition zone in E.

coli.

Brassica rapa roots extract was used to stimulate bacteriocin production compared with mitomycin-c (Mt-c ) in five isolates of the E.

coli.

It was found the extract emulate Mt-, in dimeter of inhibition zone , protein concentration and activity.

But it was better than Mt-c in some isolates.