Assessment of novel halo- and thermotolerant desert cyanobacteria for phycobiliprotein production

Four indigenous cyanobacteria isolates identified as QUCCCM 34: Chroococcidiopsis sp., 54: Pleurocapsa 77: Euhalothece and 129: Cyanobacterium sp. were investigated during this study. Temperatures salinities observed in outdoor reproduced indoor, using small-scale photobioreactors, culture conditions optimized for maximum biomass phycobiliprotein productions. The strains showed their halo thermotolerance capacity. highest productivity was 125 ± 1.1 mg x L?1 d?1 sp.at 30 °C–40 ppt. major phycobiliproteins phycocyanin, the content strain age dependent. sp reached phycocyanin (up to 160 2.6 mgPC gx-1) after 4, 8, 10 days, respectively, while it only up 100 3.5 gx-1 at day 40 °C–60 Increasing temperature salinity stimulated synthesis sp, whereas increment enhanced pigments production(both phycoerythrin phycocyanin) Finally, all pigment extracts exhibited an antioxidant radical scavenging activity which maximal from with ? 60 mM Trolox equivalent gx?1 50%, respectively.