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Folia Microbiologica

, Volume 58, Issue 1, pp 39–45 | Cite as

Evaluation of Arthrospira platensis extracellular polymeric substances production in photoautotrophic, heterotrophic and mixotrophic conditions

  • Lamia Trabelsi
  • Hatem Ben Ouada
  • Fatma Zili
  • Nahla Mazhoud
  • Jihen Ammar
Article

Abstract

The kinetic study of Arthrospira platensis extracellular polymeric substances (EPS) production under different trophic modes—photoautotrophy (100 μmol photons m−2 s−1), heterotrophy (1.5 g/L glucose), and mixotrophy (100 μmol photons m−2 s−1 and 1.5 g/L glucose)—was investigated. Under photoautotrophic and heterotrophic conditions, the maximum EPS production 219.61 ± 4.73 and 30.30 ± 1.97 mg/L, respectively, occurred during the stationary phase. Under a mixotrophic condition, the maximum EPS production (290.50 ± 2.21 mg/L) was observed during the early stationary phase. The highest specific EPS productivity (433.62 mg/g per day) was obtained under a photoautotrophic culture. The lowest specific EPS productivity (38.33 mg/g per day) was observed for the heterotrophic culture. The effects of glucose concentration, light intensity, and their interaction in mixotrophic culture on A. platensis EPS production were evaluated by means of 32 factorial design and response surface methodology. This design was carried out with a glucose concentration of 0.5, 1.5, and 2.5 g/L and at light levels of 50, 100, and 150 μmol photons m−2 s−1. Statistical analysis of the model demonstrated that EPS concentration and EPS yield were mainly influenced by glucose concentration and that conditions optimizing EPS concentration were dissimilar from those optimizing EPS yield. The highest maximum predicted EPS concentration (369.3 mg/L) was found at 150 μmol photons m−2 s−1 light intensity and 2.4 g/L glucose concentration, while the highest maximum predicted EPS yield (364.3 mg/g) was recorded at 115 μmol photons m−2 s−1 light intensity and 1.8 g/L glucose concentration.

Keywords

Extracellular Polymeric Substance Maximum Specific Growth Rate Heterotrophic Condition Mixotrophic Culture Mixotrophic Condition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Institute of Microbiology, Academy of Sciences of the Czech Republic, v.v.i. 2012

Authors and Affiliations

  • Lamia Trabelsi
    • 1
  • Hatem Ben Ouada
    • 1
  • Fatma Zili
    • 1
  • Nahla Mazhoud
    • 1
  • Jihen Ammar
    • 1
  1. 1.Laboratory of Marine Biodiversity and BiotechnologyNational Institute of Marine Sciences and TechnologyMonastirTunisia

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