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New Medium for Pharmaceutical Grade Arthrospira.

Amro A Amara1, Alexander Steinbüchel2

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This study developed a novel saline medium and photobioreactor method to isolate pure Arthrospira. This process effectively inhibits competing microalgae, yielding pharmaceutical-grade Arthrospira for various applications.

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Area of Science:

  • Biotechnology
  • Microbiology
  • Phycology

Background:

  • Arthrospira (Spirulina) is a valuable cyanobacterium for nutritional and pharmaceutical use.
  • Cultivating pure Arthrospira from mixed cultures presents challenges due to competing microalgae like Chlorella.
  • Existing methods often struggle with efficient separation and achieving pharmaceutical-grade purity.

Purpose of the Study:

  • To develop a novel cultivation medium and method for producing pharmaceutical-grade, single-cell Arthrospira from a mixed culture.
  • To optimize conditions for Arthrospira growth while inhibiting the growth of contaminating microalgae, specifically Chlorella.
  • To establish a scalable photobioreactor-based process for pure Arthrospira production.

Main Methods:

  • A new saline medium was formulated by combining elements of George's and Zarrouk's media.
  • A mixed culture of Arthrospira and Chlorella was used to test and refine the medium composition and cultivation parameters.
  • An 80-liter photobioreactor was employed for controlled cultivation, utilizing a high-salinity medium (2xA-St) followed by a reduced concentration (1.5x).

Main Results:

  • The developed medium and cultivation strategy successfully inhibited Chlorella growth.
  • Arthrospira growth was significantly enriched, leading to a pure single-cell product.
  • The photobioreactor system demonstrated effective control over the cultivation process.

Conclusions:

  • A novel method using a specifically designed saline medium in a photobioreactor enables the production of pure, pharmaceutical-grade Arthrospira.
  • This technique is effective in eliminating contaminating microalgae like Chlorella.
  • The established process is suitable for the large-scale production of Arthrospira for medicinal, pharmaceutical, and single-cell protein applications.