Phenylalanine ammonia lyase (PAL) enzyme activity and antioxidant properties of some cyanobacteria isolates

► Antioxidant properties and PAL activity of cyanobacterial isolates evaluated together. ► Microalgae have the possibility of usage as natural antioxidant and PAL sources. ► l-phe induces the total phenolic accumulation in cyanobacteria. ► Cyanobacteria may have the potential to be used in the treatment of phenylketonuria.