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Fikobiliproteiny – barwne białka o nietypowej strukturze, interesujących właściwościach i zastosowaniu

Niemczyk Emilia, Pogrzeba Jerzy, Lipok Jacek

Wiadomości Chemiczne

2024

[Z] 78, 5-6

651--671

Phycobiliproteins - colorful proteins produced by microalgae and cyanobacteria, owe their unique properties to prosthetic groups, which are open-chain tetrapyrroles. As they are produced in the biosynthesis process, phycobiliproteins possess special biotechnological potential also due to their useful physicochemical properties. A classic example is the use of these proteins - especially phycocyanin with an intense blue color - as natural dyes in the food, cosmetic and pharmaceutical industries. In the products to which they are added, they are responsible not only for color, but also for various biological activities, providing these products with additional values. In this category, the most frequently mentioned are the antioxidant properties of phycobiliproteins, which may be used in the treatment of neurodegenerative diseases, and the fluorescent properties, especially of phycoerythrin, which also predispose these proteins to use in biomedical research. The results of contemporary work on the acquisition and use of phycobiliproteins indicate that the key to the wider use of these substances is to understand the process of biosynthesis of individual groups of these colored proteins, as well as developing ways to effectively control their production. Due to the different physicochemical properties and biological activity of individual, structurally diverse phycobiliproteins, the specificity of the actions taken is extremely important in this case. Since there are real reasons to increase the scale of production of these substances by modifying the conditions of microalgae cultivation, we believe that obtaining larger amounts of specific phycobiliproteins in pure form will intensify the current use and open up new possibilities for the use of these valuable proteins.

From 3G biofuels to high-value-added bioproducts

Ledakowicz Stanisław, Antecka Anna, Gluszcz Paweł, Klepacz-Smolka Anna, Pietrzyk Damian, Szelag Rafał, Slezak Radosław, Daroch Mauycy

Chemical and Process Engineering : New Frontiers

2024

Vol. 45, nr 2

art. no. e59

The paper focused on the co-production of high-value-added product thermostable C-phycocyanin (C-PC) and biomass, further utilized in pyrolysis. The photobiosynthesis of CPC was carried out by the thermophilic cyanobacteria Synechococcus PCC6715 cultivated in the helical and flat panel photobioreactors (PBR). Despite the application of different inorganic carbon sources, both PBRs were characterized by the same growth efficiency and similar C-PC concentration in biomass. To release the intracellular C-PC the biomass was concentrated and disintegrated by the freeze-thaw method. The crude C-PC was then further purified by foam fractionation (FF), aqueous two-phase extraction (ATPE), membrane techniques (UF) and fast protein liquid chromatography (FPLC). Each of the tested methods can be used separately; however, from a practical and economic point of view, a three-stage purification system (FF, FPLC and UF) was proposed. The purity ratio of the final C-PC was about 3.9, which allows it to be classified as a reactive grade. To improve the profitability of 3G biorefinery, the solid biomass residue was used as a substrate to pyrolysis process, which leads to production of additional chemicals in the form of oils, gas (containing e.g. H 2) and biochar.