Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Biological Co2 Fixation to Antioxidant Carotenoids by Photosynthesis Using the Green Microalga Haematococcus pluvialis

광합성 녹색 미세조류 Haematococcus pluvialis를 이용한 이산화탄소 고정화 및 항산화성 카로티노이드 생산

  • Kang, Chang Duk (School of Chemical and Biological Engineering, Seoul National University) ;
  • Park, Tai Hyun (School of Chemical and Biological Engineering, Seoul National University) ;
  • Sim, Sang Jun (Department of Chemical Engineering, Sungkyunkwan University)
  • 강창덕 (서울대학교 화학생물공학부) ;
  • 박태현 (서울대학교 화학생물공학부) ;
  • 심상준 (성균관대학교 화학공학과)
  • Received : 2005.11.29
  • Accepted : 2005.12.28
  • Published : 2006.02.28
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Abstract

As one of the $CO_2$ reduction strategies, a biological method was proposed to convert $CO_2$ to useful biomass with antioxidant carotenoids by photosynthetic microorganisms. One of the photoautotrophs, Haematococcus pluvialis is a freshwater green microalga and accumulates the secondary carotenoid astaxanthin during induction of green vegetative cells to red cyst cells. In this study, $CO_2$ fixation and astaxanthin production using H. pluvialis was conducted by photoautotrophic culture in the $CO_2$ supplemented photo-incubator. Maximum growth rate of H. pluvialis was obtained at a 5％ $CO_2$ environment on basic N and P conditions of NIES-C medium. The photoautotrophic induction consisted of 5％ $CO_2$ supply and high light illumination promoted astaxanthin synthesis in H. pluvialis, yielding an astaxanthin productivity of $9.6mg/L{\cdot}day$ and a $CO_2$ conversion rate of $27.8mg/L{\cdot}day$ to astaxanthin. From the results the sequential photoautotrophic culture and induction process using H. pluvialis is expecting an alternative $CO_2$ reduction technology with a function of valuable biosubstance production.

광합성 미생물을 이용하여 $CO_2$를 항산화성 카로티노이드를 다량 함유하고 있는 바이오매스로 전환하는 새로운 방법의 생물학적 $CO_2$ 저감 기술이 제시되었다. 본 연구에서 담수 녹색 미세 조류인 Haematococcus pluvialis가 광합성 미생물로 사용되었으며, 이 균주는 녹색의 성장 세포에서 적색의 포낭 세포로 전환될 때 2차 카로티노이드인 astaxanthin을 세포 내에 다량 축적하는 것으로 알려졌다. 균주의 이러한 특성을 이용하여 $CO_2$가 연속적으로 공급되는 광 반응기에서 자가 영양 배양 방식으로 $CO_2$ 고정화 및 그것을 통한 astaxanthin 생산 연구가 수행되었다. 녹색 성장 세포의 성장은 5％ $CO_2$ 공급 환경 및 기본 NIES-C 배지에서 최대로 이루어졌다. 적색 포낭 세포로 효과적인 전환을 위해 5％ $CO_2$ 주입과 강한 빛 조사로 이루어진 자가 영양 유도법을 적용하였으며, 이 공정을 통해 $9.6mg/L{\cdot}day$의 astaxanthin 생산성을 획득하였다. 이때 astaxanthin으로 전환되는 $CO_2$의 균주 내 고정화 속도는 $27.8mg/L{\cdot}day$로 나타났다. 본 연구를 통해 제시된 H. pluvialis를 이용한 자가 영양 배양, 유도 공정은 $CO_2$ 고정화뿐만 아니라 고부가 생리 물질 생산기능을 겸비하여 새로운 $CO_2$ 저감기술로 적용될 수 있을 것으로 기대된다.

Keywords

Acknowledgement

Supported by : 과학기술부

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