Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Growth and r-Linolenic Acid Production of Arthrospira (Spirulina) platensis in Heterotrophic Culture.

Arthrospira (Spirulina) platensis의 종속영양배양과 r-Linolenic Acid 생산

  • Choi, Gang-Guk (Biological Resource Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Bae, Myoung-Sook (Biological Resource Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Park, Je-Seop (Biotechnology Laboratory, R&D Center, Daesang Corporation) ;
  • Park, Bok-Jun (Biotechnology Laboratory, R&D Center, Daesang Corporation) ;
  • Ahn, Chi-Yong (Biological Resource Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Oh, Hee-Mock (Biological Resource Center, Korea Research Institute of Bioscience and Biotechnology)
  • Published : 2007.03.28
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Abstract

Arthrospira (Spirulina) platensis is one of the commercially important filamentous cyanobacteria. The heterotrophic cultivation of Arthrospira can be an alternative strategy for commercial mass production. In heterotrophic culture, the specific growth rate of A. platensis M9108, a glucose-resistant mutant of A. platensis PCC 9108, was $0.014h^{-1}$ which was 1.8 higher than that oi the previous report. The mutant possessed the facility to assimilate and to metabolize glucose efficiently under heterotrophic condition. However, the r-linolenic acid content of 6 Arthrospira strains was not increased in heterotrophic culture. Four Arthrospira strains out of 6 tested strains were able to utilize maltose as a carbon source under heterotrophic condition. The biomass production of these strains on maltose was similar to that on glucose. The specific growth rate of A. platensis M9108 increased with glucose concentration up to 5.0 g/L and then decreased at a glucose concentration of 10.0 g/L. Additionally, A. platensis M9108 under heterotrophic condition showed no aggregation during the cultivation in contrast to A. platensis PCC 9108.

Arthrospira에 대한 종속영양배양 결과, A. platensis M9108(A. platensis PCC 9108의 고농도 glucose 내성 돌연변이)은 glucose 5.0 g/L 첨가된 SOT 배지에서 8일 동안 배양하여 0.54 g/L의 생물량을 얻었으며, 일일생산량은 0.068 g/L/day을 보였고, specific growth $rate(\mu)$는 0.014/h를 보였다. A. platensis M9108의 일일생산량과 $\mu$는 모균주인 A. platensis PCC 9108에 비하여 각각 1.3배와 1.2배 향상된 결과를 보였으며, 이전에 보고된 결과에 비하여 각각 1.3배와 1.8배 증가하였다. Arthrospira의 건체량 중 지방산과 r-linolenic acid의 함량은 각각 $1.94\sim4.97%$와 $0.13\sim1.33%$로 균주에 따라 상당히 다양하였다. Arthrospira는 유기탄소원으로 glucose를 첨가한 조건에서 성장이 가장 좋았으며, A. platensis M9108의 경우 maltose의 이용능도 glucose 이용 능과 비슷하였다. A. platensis M9108의 성장은 glucose의 5.0 g/L까지는 증가하였지만, 10.0 g/L에서는 저해되는 양상을 보였다. 또한 고농도의 탄소원을 이용한 종속영양배양 중 발생하는 세포의 뭉침 현상이 A. platensis M9108에서는 관찰되지 않아 안정적으로 고농도 생산에 유용할 것으로 판단된다.

Keywords

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