Journal
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
Volume 65, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.algal.2022.102752
Keywords
Galdieria sulphuraria; Glucose and xylose; Heterotrophic; Mixotrophic; Phycocyanin; Corn stover hydrolysates
Categories
Funding
- Universidad Nacional Autonoma de Mexico (UNAM) -PAPIIT-DGAPA-UNAM Grant [IT201119]
- CONACyT
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Research found that using glucose under heterotrophic conditions can improve the growth rate, biomass volumetric productivity, and biomass yield of microalgae Galdieria sulphuraria, but inhibits the production of phycocyanin. Using hemicellulosic corn stover hydrolysates may hinder microalgae growth.
The production of cell mass and phycocyanin (PC) was evaluated with the extremophile microalgae Galdieria sulphuraria 2919, under mixotrophic and heterotrophic conditions, in media supplemented with glucose, xylose, or a mixture of both sugars, and hemicellulosic and cellulosic hydrolysates from corn stover. Compared to xylose, cultivations with glucose under heterotrophic conditions showed 51%, 42%, and 66% higher specific growth rate, biomass volumetric productivity, and biomass yield, respectively. Glucose caused a suppression of xylose consumption and PC content was 54.4% lower when xylose was used, suggesting it inhibits the production of this pigment-protein. The use of hemicellulosic corn stover hydrolysates, hindered microalga growth because acetate at low concentrations (approximately 0.6 g L-1) caused inhibition of G. sulphuraria growth. The cellulosic fraction of corn stover was saccharified using cellulases to obtain a syrup containing glucose without acetate. When G. sulphuraria was cultivated under heterotrophic conditions on this syrup, the microalgae accumulated up to 165 mgPC gSolubleProtein1 .
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