Comparison of Growth Rate and Nutrient Content of Five Microalgae Species Cultivated in Greenhouses
Maria N. Metsoviti | George Papapolymerou | Ioannis T. Karapanagiotidis | Nikolaos Katsoulas
The effect of different environmental conditions on the growth rate, biomass production, nutrient composition, and phenolic content of the microalgae species <i>Chlorella vulgaris</i>, <i>Botryococcus braunii</i>, <i>Chlamydomonas reinhardtii</i>, <i>Euglena gracilis</i>, and <i>Nannochloropsis oculata</i> was investigated. The experiments were conducted in open bioreactors in a greenhouse in three different periods (during October, March, and June), and in a controlled environment in a closed plant growth chamber. It was found that the growth rate and production of <i>C. vulgaris</i> and <i>B. braunii</i> was higher during March, <i>C. reinhardtii</i> and <i>N. oculata</i> grew better in June, and the growth of <i>E. gracilis</i> was similar in March and June. The lipid content of the biomass of all five species increased with increasing light intensity and temperature, while the nitrogen free extractable (NFE) content decreased and the protein, fiber, moisture, and ash content remained relatively unaffected. The phenolic content varied from species to species with <i>E. gracilis</i> having the highest and <i>N. oculata</i> the lowest content among the species studied. The results can be taken into account when cultivating the different microalgae studied in full scale applications, such as in open raceway bioreactors, where conditions could be adjusted to obtain the most favorable growth conditions, depending on the particular species cultivated.
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