Composition and accumulation of secondary carotenoids in Chlorococcum sp.

  • D. H. Zhang
  • Y. K. Ng
  • S. M. Phang
Article

Abstract

A locally isolated Chlorococcum sp. could accumulate astaxanthin and its esters as secondary carotenoids. The secondary carotenoids could reach a concentration of 5.2 mg g−1 d. wt, and were located in the cytoplasm and chloroplast as globules. Cells grew best at pH 8.0 and 30 °C, at which the growth rate was about 0.066 h−1. Acidic condition (pH 5.5 and 6.5) and slightly elevated temperature (35 °C) enhanced the cellular accumulation of astaxanthin. Outdoor studies indicated that Chlorococcum sp. grew well in a tubular photobioreactor. In medium containing 2 mM and 10 mM NH4CI, the cellular contents of total secondary carotenoids and astaxanthin reached similar levels (5.0 mg g−1 d. wt and 2.0 mg g−1 d. wt, respectively) in the 15 days of cultivation, while the yield of total secondary carotenoids and astaxanthin in 10 mM NH4CI were higher (45 mg L−1 and 18 mg L−1, respectively). The advantages of tolerance to high temperature and extreme pH values, relative fast growth rate and ease of cultivation in outdoor system suggest that Chlorococcum sp. could be a potential candidate for mass production of secondary carotenoids in particular astaxanthin.

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Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • D. H. Zhang
    • 1
  • Y. K. Ng
    • 1
  • S. M. Phang
    • 2
  1. 1.Department of Microbiology, Faculty of MedicineNational University of SingaporeSingapore
  2. 2.Institute of Advanced StudiesUniversity of MalayaKuala LumpurMalaysia

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