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Bioprocess strategies for enhancing biomolecules productivity in Chlorella fusca LEB 111 using CO 2 a carbon source
Author(s) -
Moraes Luiza,
Santos Lucielen O.,
Costa Jorge A. V.
Publication year - 2019
Publication title -
biotechnology progress
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.572
H-Index - 129
eISSN - 1520-6033
pISSN - 8756-7938
DOI - 10.1002/btpr.2909
Subject(s) - biomass (ecology) , productivity , carbon dioxide , carbon fixation , carbon fibers , food science , bioconversion , chemistry , zoology , bioenergy , biology , biofuel , botany , microbiology and biotechnology , agronomy , fermentation , organic chemistry , mathematics , composite number , economics , macroeconomics , algorithm
The aim of this study was to evaluate the influence of different carbon dioxide (CO 2 ) concentrations on the distribution of carbon forms in the culture medium and the biomass production and biomolecules productivity of the strain Chlorella fusca LEB 111. In this study, experiments were carried out in which C. fusca cultures were exposed to different CO 2 concentrations, 0.03% (0.08 ml CO2 ml medium −1 days −1 ), 5% (0.18 ml CO2 ml medium −1 days −1 ), and 15% vol/vol CO 2 (0.54 ml CO2 ml medium −1 days −1 ). Among the carbon chemical species distributions in the culture medium, bicarbonate was predominant (94.2–98.9%), with the highest quantitative percentage in the experiment receiving a 15% CO 2 injection. C. fusca LEB 111 cultivated with 15% CO 2 showed the highest biomass productivity (194.3 mg L −1 days −1 ) and CO 2 fixation rate (390.9 mg L −1 days −1 ). The carbohydrate productivity in the culture that received 15% CO 2 was 46.2% higher than the value verified for the culture with the addition of CO 2 from the air (0.03% CO 2 ). In addition, CO 2 concentration providing increases of 0.03–15% to C. fusca cultures resulted in a 31.6% increase in the lipid productivity. These results showed that C. fusca can be used for CO 2 bioconversion and for producing biomass with potential applications for biofuels and bioproducts.