ABSTRACT
The algal species Spirulina platensis have the potential to produce
a large number of antimicrobial substances that considered as suitable
bio-control agents for plant pathogenic bacteria. The present study aimed
to synthesize nano- material of S. platensis, use anti-bacteria material of
S. platensis using solvent extracts and tested them against pathogenic
bacteria by Standard well diffusion method for antibacterial activity.
Mullor Hinton Agar (MHA) plates and pure cultures of bacterial
pathogens were grown in Nutrient broth at 37OC for 18-24 hours. In the
present, the tested positive and negative gram bacteria were isolated from
water Omar Bek drainage water-Damietta branch of Nile River
The data of sodium-citrate extraction showed maximum zone of
inhibition against all the bacterial isolated while extraction of S. platensis
showed minimum inhibition zone against bacterial pathogens in
comparison to other solvent extracts. Nano material recorded the highest
zone of inhibition against Yersinia pestis (45mm) in comparison with Nacitrate
against Staphylococcus aureus (20mm) as an organic solvent
extract. The research concluded and recommended S. platensis should be
considered as an economic antibacterial agent than using medical
antimicrobials against pathogenic bacteria.