Journal
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
Volume 92, Issue 4, Pages 781-786Publisher
WILEY
DOI: 10.1002/jctb.5059
Keywords
microalgae; mixotrophic cultivation; ethanol feed rates; organic carbon source; fed-batch
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Funding
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [10/51503-4]
- Coordenacao e Aperfeicoamento de Pessoal de Nivel Superior (CAPES/PNPD), Brazil
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [10/51503-4] Funding Source: FAPESP
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BACKGROUND: Ethanol may be an attractive carbon source for microorganism growth for the production of several biomolecules. Nonetheless, high amounts of ethanol may be harmful for microbial cells. This study evaluated the effect of adding ethanol to the cultivation of Scenedesmus obliquus, under batch and fed-batch processes. RESULTS: A single addition of ethanol up to 460.00mgL(-1) did not influence cell growth, but above this threshold, different concentrations of ethanol had positive effects on maximum cell concentration. On the other hand, when ethanol was added daily for a period of 10 days, even the smallest ethanol feed rate (5.75mg L-1 d(-1); total added ethanol concentration= 57.5mg L-1) positively influenced maximum cell concentration. Daily addition of 368mgL(-1) (fed-batch culture; total added ethanol concentration= 3680mgL(-1)) allowed the best cell growth of this study, with maximum cell concentration of 1068.70mgL(-1) and cell productivity of 113 +/- 7.13mgL(-1) d(-1). Under this condition, the maximum specific growth rate and maximum cell concentration obtained with mixotrophic growth were 2.83 and 2.70 times higher, respectively, than those obtained with autotrophic growth. CONCLUSION: Cultures supplied with ethanol significantly improved cell growth. Addition of ethanol by a fed-batch process allowed the highest biomass production with a total added ethanol concentration that hindered cell growth by batch process. (C) 2016 Society of Chemical Industry
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