Comparative evaluation of biochemical composition of microalgae biomass Chlorella vulgaris and Scenedesmus оbliquus
V.А. Lukyanov, S.Yu. Gorbunova, I.V. Gribovskaya
Section: Population ecology
A comparative evaluation of the productivity, biochemical, mineral and fatty acid composition of dry biomass of two green microalgae Ch. vulgaris and S. obliquus was carried out. Under these conditions of cultivation, no significant differences between the values of the maximum productivity of microalgae were found. After 72 hours of cultivation, the maximum density of Ch. vulgaris and S. obliquus increased by 10 times. The superiority of S. obliquus biomass quality in the following biochemical parameters was established: protein - 68.7%, lipids - 27.6% carotenoids - 0.096 mg/g. It has been shown that when growing the studied species of microalgae on the same Tamiya nutrient medium, their biomass had a sufficiently distinct mineral composition. It has been experimentally established that the nitrogen content in S. obliquus cells was by 2,5% higher than in Ch. vulgaris cells, herewith the concentration of phosphorus was almost the same. The sodium content in Ch. vulgaris biomass was twice as little as its quantity in S. obliquus; potassium was 3 times less. Calcium, sulfur, magnesium, iron had a higher content in Ch. vulgaris microalgae. The concentrations of Сr и Pb were higher in S. obliquus biomass. The difference in the quantitative composition of fatty acids of the studied objects has been established. In Ch. vulgaris biomass the following acids predominated (their content was more than 5%): 16:0 – 23,63%, 16:2ω4 – 6,37%, 18:0 - 18,57%, 18:2ω6 – 16,73%, 18:3ω3 – 5,46% and 24:0 – 5,46%; as far as S. оbliquus biomass is concerned the acids whose content was more than 5% were the following: 16:0 – 18,82%, 16:4ω3 - 9,82%, 18:1ω9 – 10,81%, 18:2ω6 - 21,54% and 18:3ω3 – 10,74%.