Organic Carbon Is Ineffective in Enhancing the Growth of <i>Dunaliella</i>
Gleison de Souza Celente | Tiele Medianeira Rizzetti | Rosana de Cassia de Souza Schneider | Patricia J. Harvey | Yixing Sui
(1) Background: Mixotrophic growth is commonly associated with higher biomass productivity and lower energy consumption. This paper evaluates the impact of using different carbon sources on growth, protein profile, and nutrient uptake for <i>Dunaliella tertiolecta</i> CCAP 19/30 to assess the potential for mixotrophic growth. (2) Methods: Two experimental sets were conducted. The first assessed the contribution of atmospheric carbon to <i>D. tertiolecta</i> growth and the microalgae capacity to grow heterotrophically with an organic carbon source to provide both carbon and energy. The second set evaluated the impact of using different carbon sources on its growth, protein yield and quality. (3) Results: <i>D. tertiolecta</i> could not grow heterotrophically. Cell and optical density, ash-free dry weight, and essential amino acids index were inferior for all treatments using organic carbon compared to NaHCO<sub>3</sub>. Neither cell nor optical density presented significant differences among the treatments containing organic carbon, demonstrating that organic carbon does not boost <i>D. tertiolecta</i> growth. All the treatments presented similar nitrogen, phosphorus, sulfur recovery, and relative carbohydrate content. (4) Conclusions: Based on the results of this paper, <i>D. tertiolecta</i> CCAP 19/30 is an obligated autotroph that cannot grow mixotrophically using organic carbon.
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