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Long-term biofouling formation mediated by extracellular proteins in Nannochloropsis gaditana microalga cultures at different medium N/P ratios
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  • Y. Soriano-Jerez,
  • Lorenzo López-Rosales,
  • MªCarmen Cerón-García,
  • Asterio Sanchez-Miron,
  • Juan Gallardo Rodríguez,
  • Francisco García,
  • Emilio Grima
Y. Soriano-Jerez
University of Almería
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Lorenzo López-Rosales
Universidad de Almeria
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MªCarmen Cerón-García
University of Almería
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Asterio Sanchez-Miron
UAL
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Juan Gallardo Rodríguez
University of Almería
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Francisco García
University of Almería
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Emilio Grima
Universidad de Almeria
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Abstract

Biofouling represents an important limitation in photobioreactor cultures. The biofouling propensity of different materials (polystyrene, borosilicate glass, polymethyl methacrylate and polyethylene terephthalate glycol-modified) and coatings (two spray-applied and nanoparticle-based superhydrophobic coatings and a hydrogel-based fouling release coating) was evaluated by means of a short-term protein test, using bovine serum albumin (BSA) as a model protein, and by the long-term culture of the marine microalga Nannochloropsis gaditana under practical conditions. The results from both methods were similar, confirming that the BSA test predicts microalgal biofouling on surfaces exposed to microalgae cultures; these secrete macromolecules, such as proteins, that have a high capacity for forming a conditioning film prior to cell adhesion. The hydrogel-based coating showed significantly reduced BSA and N. gaditana adhesion, whereas the other surfaces failed to control biofouling. Microalgal biofouling was associated with an increased concentration of sticky extracellular proteins at low N/P ratios (below 15).

Peer review status:ACCEPTED

26 Aug 2020Submitted to Biotechnology and Bioengineering
27 Aug 2020Submission Checks Completed
27 Aug 2020Assigned to Editor
01 Sep 2020Reviewer(s) Assigned
29 Sep 2020Review(s) Completed, Editorial Evaluation Pending
29 Sep 2020Editorial Decision: Revise Minor
03 Nov 20201st Revision Received
05 Nov 2020Assigned to Editor
05 Nov 2020Submission Checks Completed
06 Nov 2020Reviewer(s) Assigned
13 Nov 2020Editorial Decision: Revise Minor
13 Nov 2020Review(s) Completed, Editorial Evaluation Pending
14 Nov 20202nd Revision Received
16 Nov 2020Assigned to Editor
16 Nov 2020Submission Checks Completed
20 Nov 2020Review(s) Completed, Editorial Evaluation Pending
20 Nov 2020Editorial Decision: Accept