Journal of Basic and Environmental Sciences

Vol.7 No.1

Effect of ultraviolet-B radiation on Biochemical composition and antibacterial activities of Spirulina platensis
Khalil M. DomanAhmed M. Abd El-Monem and Mohamed M. Gharieb


Biomass production of S. platensis has been evaluated under ultraviolet-B (UV-B) radiation stress to maximize the algal growth. It was cultivated in Zarrouk’s media with applying some stress was treated under high dose rates of (UV-B) with altered time durations of (15, 30 and40 mins). The highest content of its dry weigh, chlorophyll a, carotenoids, protein and carbohydrates are recorded at UVB light (312 nm) for 15 mins. . As its phenolic content was maximized with acetone extract at control while flavonoids were detected with ethanol extract at UV- 45mins. Antibacterial activity of S. platensis was prepared in 70% (acetone, methanol and ethanol) at different (UV-B) radiation and tested against some pathogenic bacterial. Its highest antibacterial activities were reported with 70% acetone extract. The impact of UV-B radiation on S. platensis led to a drop in protective mechanisms with associated decline in growth and at high intensity studied Antimicrobial activity of S. platensis.

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