Abstract
The key factors influencing the production of C-phycocyanin (C-PC) and extracellular polymeric substances (EPS) by photoautotrophic culture of Arthrospira sp. were optimized using Taguchi method. Six factors were varied at either three or two levels as follows: light intensity at three levels; three initial culture pHs; two species of Arthrospira; three concentrations of Zarrouk’s medium; three rates of aeration of the culture with air mixed with 2% v/v carbon dioxide; and two incubation temperatures. All cultures ran for 14 days. The optimal conditions for the production of C-PC and EPS were different. For both products, the best cyanobacterium proved to be Arthrospira maxima IFRPD1183. The production of C-PC was maximized with the following conditions: a light intensity of 68 µmol photons m−2 s−1 (a diurnal cycle of 16-h photoperiod and 8-h dark period), an initial pH of 10, the full strength (100%) Zarrouk’s culture medium, an aeration rate of 0.6 vvm (air mixed with 2% v/v CO2) and a culture temperature of 30 °C. The concentration of Zarrouk’s medium was the most important factor influencing the final concentration of C-PC. The optimal conditions for maximal production of EPS were as follows: a light intensity of 203 µmol photons m−2 s−1 with the earlier specified light–dark cycle; an initial pH of 9.5; a 50% strength of Zarrouk’s medium; an aeration rate of 0.2 vvm (air mixed with 2% v/v CO2); and a temperature of 35 °C. Production of C-PC and EPS in raceway ponds is discussed.
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Abbreviations
- A 620 :
-
Spectrophotometric absorbance at 620 nm
- Ave:
-
Average value
- C b :
-
Dry biomass concentration
- C C-PC :
-
Concentration of C-PC
- C EPS :
-
Concentration of EPS
- C-PC:
-
C-phycocyanin
- DCW:
-
Dry cell weight
- DOFFactor :
-
Degree of freedom of factors
- EPS:
-
Extracellular polymeric substances
- \( \bar{F}_{i} \) :
-
Averages of signal-to-noise ratio of factors at each factor level
- F ratio :
-
F-ratio
- f :
-
A cyanobacterium-dependent constant
- N :
-
Noise
- n :
-
Number of experimental trials
- ODxxx :
-
Optical density at xxx nm
- Q C-PC :
-
Volumetric rate of C-PC production
- Q EPS :
-
Volumetric rate of EPS production
- SSError :
-
Sum of squares of error
- SSFactor :
-
Sum of squares of factors
- S :
-
Signal
- t d :
-
Doubling time
- \(\bar {T}\) :
-
Grand average of signal-to-noise ratio
- w :
-
Weight of the dry biomass in the culture broth
- y i :
-
Observed values of concentrations, productivities and yields of C-PC and EPS
- Y opt :
-
Expected values of concentrations, productivities and yields of C-PC and EPS
- Y C-PC/X :
-
C-PC yield on biomass
- Y EPS/X :
-
EPS yield on biomass
- µ :
-
Specific growth rate
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Acknowledgements
This work was supported by: Ministry of Science and Technology, Thailand; the Department of Biotechnology, Kasetsart University; the Center for Advanced Studies in Tropical Natural Resources, Kasetsart University Institute for Advanced Studies (KUIAS); and the Higher Education Research Promotion and National Research University Project of Thailand, Office of the Higher Education Commission.
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Dejsungkranont, M., Chisti, Y. & Sirisansaneeyakul, S. Optimization of production of C-phycocyanin and extracellular polymeric substances by Arthrospira sp.. Bioprocess Biosyst Eng 40, 1173–1188 (2017). https://doi.org/10.1007/s00449-017-1778-y
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DOI: https://doi.org/10.1007/s00449-017-1778-y