Effect of temperature and nitrogen concentration on biomass composition of Heterochlorella luteoviridis
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Sociedade Brasileira de Ciência e Tecnologia de Alimentos
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The interest in microalga as a food supplement has grown due their high contents of carotenoids, polyunsaturated fatty acids and proteins. This study evaluated the effect of different temperatures (22, 27 or 32 °C) and sodium nitrate concentrations (12, 24, 36, 48 or 60 mg L -1 of N-N D 3 ) in culture medium on Heterochlorella luteoviridis biomass production and composition. The highest biomass concentration (3.35 g L -1 ) was observed at the highest N-N D 3 concentration. The N-N D 3 concentration positively affected protein, carbohydrate and carotenoids contents of biomass. Dn the other hand, cells cultured at the lowest N-N D 3 concentration showed a slight increment in lipid content. The major carotenoid was lutein (30.7 ± 1.4% of total carotenoids), and the polyunsaturated fatty acids were 37 ± 2% of total fatty acids. Low temperature improved the biosynthesis of ω3 type fatty acids by lowering the ω6:ω3 ratio. D verall, our results indicate H. luteoviridis can yield high biomass concentration under autotrophic growth, resulting in a biomass rich in carotenoids, mainly lutein, and ω3 polyunsaturated fatty acids.
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