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¹ Dokuz Eylül University, Faculty of Science, Chemistry Department, Biochemistry Division, 35160 Buca-Izmir, Turkey
² Dokuz Eylül University, Graduate School of Natural and Applied Sciences, Chemistry Department, 35160 Buca-Izmir, Turkey DOI : 10.4194/1303-2712-v19_10_07 Viewed : 3460 - Downloaded : 3402 The aim of this study was to investigate the effects of Mg2+ (0 - 4 mM), and Cu2+ (0 - 5 µM) concentrations on biomass and photosynthetic pigment-metabolites, and photosystem II activity in Arthrospira platensis Gomont 1892. The highest biomass was determined on control condition including both Mg²⁺ (0.8 mM) and Cu²⁺ (0.5 µM) as 49.1±1.6 mg mL^-1. lthough the levels of phycocyanin, allophycocyanin and chlorophyll a were varied due to Mg²⁺ concentration, phycocyanin and allophycocyanin were the major fractions. The highest chlorophyll a level was detected at 0.5 µM Cu²⁺. The major carotenoid was β-carotene, and its highest value was determined in the absence of Cu²⁺ as 2400±60 µg mL^-1. In addition, excessive and insufficient amounts of Mg²⁺ and Cu²⁺ caused a decrease in photosystem II activities of A. platensis. This work provides a good example for the production of carotenoids for use in various industries, such as food, cosmetic and pharmaceutical products. Keywords : Phycocyanin, Chlorophyll a, β-carotene, Cu2+, Mg2+, Photosystem II, Arthrospira platensis