Direct and highly productive conversion of cyanobacteria Arthrospira platensis to ethanol with CaCl2 addition

Biotechnology for Biofuels
Shimpei AikawaAkihiko Kondo

Abstract

The cyanobacterium Arthrospira platensis shows promise as a carbohydrate feedstock for biofuel production. The glycogen accumulated in A. platensis can be extracted by lysozyme-degrading the peptidoglycan layer of the bacterial cell walls. The extracted glycogen can be converted to ethanol through hydrolysis by amylolytic enzymes and fermentation by the yeast Saccharomyces cerevisiae. Thus, in the presence of lysozyme, a recombinant yeast expressing α-amylase and glucoamylase can convert A. platensis directly to ethanol, which would simplify the procedure for ethanol production. However, the ethanol titer and productivity in this process are lower than in ethanol production from cyanobacteria and green algae in previous reports. To increase the ethanol titer, a high concentration of A. platensis biomass was employed as the carbon source for the ethanol production using a recombinant amylase-expressing yeast. The addition of lysozyme to the fermentation medium increased the ethanol titer, but not the ethanol productivity. The addition of CaCl2 increased both the ethanol titer and productivity by causing the delamination of polysaccharide layer on the cell surface of A. platensis. In the presence of lysozyme and CaCl2, ethanol ti...Continue Reading

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Citations

Jul 29, 2019·Folia Microbiologica·Gergely Ernő LakatosJiří Masojídek
May 4, 2021·Frontiers in Microbiology·McKenna HicksDavid L Bernick

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Methods Mentioned

BETA
transfection
delamination
light scattering

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