Solvent extracts of five different microalgal strains including Tetraselmis sp., Dunaliella sp., Chlorella sp.,Synechocystis sp., and Oscillatoria sp. were screened for seven phytochemical activities. Antimicrobial activity of solvent extracts was tested against seven bacterial and three fungal strains. The antioxidant potential of solvent extracts was analyzed using the DPPH scavenging assay. Flavonoids were predominantly found in all the solvent extracts. Microalgal strains showed
better antifungal than antibacterial activity. Acetone extract of Dunaliella sp. showed highest percentage DPPH scavenging
activity. The extracts showing highest antimicrobial and DPPH scavenging activity were subjected to GC-HRMS. The results showed the presence of Octadecanoic acid-4-hydroxy-methyl ester, benzoic acid, hexadecanoic acid and Tetradecanoic acid, confirming the bioactive compounds in the algal extracts.