DEMONSTRATION OF MARINE MICROALGAE AS AN ALTERNATIVE TO ANTIBIOTICS AGAINST BACTERIAL DISEASES OF POULTRY

Abstract

Antimicrobial activity of the methanolic extract of dried marine microalgae Tetraselmis sp, Nannochloropsis sp. and Chlorella sp. was studied against Gram-negative Escherichia coli and Stenotrophomona smaltophilia and Gram-positive Staphylococcus saprophyticus. The largest inhibition zone (8.30 mm in diameter) appeared around the disc loading of extract of Chlorella against Escherichia coli. Moreover, Tetraselmis showed strong antimicrobial activity (20mg/ml) against Stenotrophomonas maltophilia, andChlorella against E. coli and Staphylococcus (10mg/ml).The observed antimicrobial activities might be linked to the contents of the extracts in fatty acid, carotenoids, chlorophylls, hycocyanin, phycoerythrin, phycobiliprotein and phenolic compounds that need to be determined. The studied microalgae could be considered as a potential natural source of bioactive compounds with antimicrobial activities