Cyanobacterial pigments have attracted considerable attention in industry due to their bioactive potential and natural origin. In the present study, the growth dynamics and pigment composition, in terms of chlorophyll a, total carotenoids and phycobiliprotein content, of four cyanobacterial strains isolated from thermal springs, namely Oscillatoria subbrevis CZS 2201, Phormidium ambiguum CZS 2205, Nostoc calcicola TSZ 2203, and Synechococcus sp. CZS 2204, were investigated. The analysis revealed that the maximum quantity of chlorophyll a and total carotenoids was observed in Oscillatoria subbrevis CZS 2201 (26.49 and 3.44 µg mL-1), followed by Phormidium ambiguum CZS 2205 (18.64 and 2.32 µg mL-1), whereas a minimum amount was detected in Synechococcus sp. CZS 2204 (12.13 and 1.24 µg mL-1), respectively. In addition, Oscillatoria subbrevis CZS 2201 showed higher quantity of phycobiliproteins, especially C-phycocyanin (45.81 mg g-1), C-phycoerythrin (64.17 mg g-1) and C-allophycocyanin (27.45 mg g-1). Moreover, carotenoid derivatives of Oscillatoria subbrevis CZS 2201 were also identified, among which β-carotene was the dominant form (1.94 µg mL-1), while the accumulation of zeaxanthin and myxoxanthophyll was relatively high (0.53 and 0.41 µg mL-1, respectively) compared with echinenone and cryptoxanthin (0.34 and 0.23 µg mL-1, respectively). The study revealed that Oscillatoria subbrevis CZS 2201 was a potent producer of secondary carotenoids, including myxoxanthophyll.

Department of Chemical and Biochemical Engineering Geology and Oil Gas Business Institute Named after K Turyssov Satbayev University Satpaev 22 Almaty 050043 Kazakhstan

Ecology Research Institute Khoja Akhmet Yassawi International Kazakh Turkish University Turkistan 161200 Kazakhstan

Faculty of Biology and Biotechnology Al Farabi Kazakh National University Al Farabi 71 Almaty 050038 Kazakhstan

K A Timiryazev Institute of Plant Physiology Russian Academy of Sciences Botanicheskaya Street 35 Moscow 127276 Russia

Laboratory of Algal Biotechnology Centre ALGATECH Institute of Microbiology Czech Academy of Sciences Novohradská 237 Opatovický mlýn 37981 Třebon Czech Republic

Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences No 32 West 7th Road Tianjin Airport Economic Area Tianjin 300308 China

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