Abstract
Spirulina, a photosynthetic cyanobacteria, has bioactive molecules such as phycobiliproteins which are useful in bioindustries. Aqueous two-phase extraction, an industrially effective process, have been applied to extract invaluable molecules from Spirulina, but mainly focused on optimal extraction of C-Phycocyanin. This research is to selectively remove chlorophyll a-pertaining photosystem polypeptides by stably forming interfacial layer between two phases of polyethylene glycol/potassium phosphate. Under an optimal condition of aqueous two-phase extraction, a stable interfacial layer was formed, while preserving purification efficiency of C-Phycocyanin. Through UV, fluorescence, and gel electrophoresis, chlorophyll a-pertaining photosystem polypeptides were ascertained to be extracted in the interfacial layer. C-Phycocyanin was mainly present in the top phase and allophycocyanin was in the bottom phase. In addition, the safety of the purified C-Phycocyanin was confirmed by examining cytotoxicity of C-Phycocyanin. In conclusion, a stable formation of interfacial layer was proved to be helpful in understanding the selective extraction of chlorophyll a-pertaining photosystem polypeptides, and the purified C-Phycocyanin can be used without cytotoxicity.
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Acknowledgement
This research was supported by Korea Institute of Marine Science & Technology Promotion (KIMST) funded by the Ministry of Oceans and Fisheries (20220380), and also by the Ministry of Trade, Industry & Energy(MOTIE), Korea, under the “Regional Cooperation Innovative Growth R&D Program(R&D, P0021579)” supervised by the Korea Institute for Advancement of Technology(KIAT).
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Cho, Y.J., Lee, B.M., Baek, Y. et al. Selective Extraction of Chlorophyll a/Photosystem Polypeptides from Spirulina maxima Using Aqueous Two Phase Extraction. Biotechnol Bioproc E 27, 1014–1021 (2022). https://doi.org/10.1007/s12257-022-0098-5
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DOI: https://doi.org/10.1007/s12257-022-0098-5