Natural and medical sciences

2022 Issue №1

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On physicochemical properties of microalgae of the Baltic Sea



Microalgae are common in soil, marine and freshwater ecological systems. They are able to accumulate valuable biologically active substances in the course of life. At present, microalgae have not been studied well enough. Thus, the purpose of this project was to study the physicochemical properties of microalgae of the Baltic Sea in the Kaliningrad region. The amount of protein was determined by the Bradford method, while lipids were assessed by the Folch method. As a result of the work, it was proved that the maximum value of the indicator — optical density — was noted in the microalgae Chlorella vulgaris. Pleurochrysis carterae and Arthrospira platensis are characterized by the highest suspension density after 7 days of cultivation. The smallest is Chlorella vulgaris. High values of dynamic viscosity were found in suspensions of Dunaliella salina and Pleurochrysis carterae microalgae. Suspension of microalgae Arthrospira platensis is characterized by the lowest value of dynamic viscosity. It has been established that the value of the active acidity of the suspension of all the studied samples of microalgae have different values, but all the studied microalgae is found to grow and actively develop in an alkaline environment. It has been shown that during the cultivation of microalgae cell culture, the largest amount of protein accumulates in Arthrospira platensis. The amount of protein in the cultivation of Dunaliella salina and Chlorella vulgaris cell cultures was approximately the same. It is planned to create dietary supplements and functional foods from secondary metabolites of microalgae.