Biomass and phycobiliprotein production of Galdieria sulphuraria, immobilized on a twin-layer porous substrate photobioreactor

Dora Allegra Carbone*, Giuseppe Olivieri, Antonino Pollio, Michael Melkonian

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

The extremophile red alga Galdieria sulphuraria was successfully grown immobilized in a twin-layer porous substrate bioreactor (TL-PSBR). A maximal biomass growth rate of 10 g dry weight m−2 day−1 was measured at a photon fluence rate of 200 μmol photons m−2 s−1 with addition of 1% CO2 and a temperature of 34 °C. Under these conditions, a maximal biomass value of 232 g m−2 was attained after 33 days of growth. Phycobilin productivity, however, was highest at a lower photon fluence rate of 100 μmol photons m−2 s−1 and reached a phycobilin value of 14 g m−2, a phycobilin content in the biomass of 63 mg g−1 and a phycobilin growth rate of 0.28 g m−2 day−1 for phycocyanin and 0.23 g m−2 day−1 for allophycocyanin. Addition of CO2 was essential to enhance growth and phycobilin production in G. sulphuraria and further optimization of the cultivation process in the TL-PSBR appears possible using a multi-phase approach, higher growth temperatures and optimization of nutrient supply. It is concluded that autotrophic cultivation of G. sulphuraria in a TL-PSBR is an attractive alternative to suspension cultivation for phycobilin production and applications in bioremediation.

Original languageEnglish
JournalApplied Microbiology and Biotechnology
Volume104
DOIs
Publication statusPublished - 14 Feb 2020

Keywords

  • Biomass
  • Extremophile organism
  • Galdieria sulphuraria
  • Phycocyanin
  • Twin layer

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