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Degradation of aromatic compounds and lignin by marine protist Thraustochytrium striatum

Journal Article · · Process Biochemistry
 [1];  [2];  [3];  [2];  [4];  [5];  [6]
  1. Kansas State Univ., Manhattan, KS (United States); Chinese Academy of Sciences (CAS), Shanghai (China)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Clemson Univ., SC (United States)
  5. Xiamen Univ. (China)
  6. Kansas State Univ., Manhattan, KS (United States)

This paper aimed at studying a novel high biomass strain (HBS) of marine protist, Thraustochytrium striatum, for lignin valorization to lipids and carotenoids. In the screening of 15 aromatic compounds, T. striatum HBS can utilize most compounds while achieving the best growth on 3,4-dihydroxybenzoic acid (3,4-DHBA) and 4-hydroxybenzoic acid (4-HBA). The maximum cell mass concentration reached 2-3 g/L under 5 g/L of 3,4-DHBA or 2 g/L of 4-HBA, which was comparable to that under equivalent concentration of glucose. The long-chain fatty acids content was 13 % and 7 % with 3,4-DHBA and 4-HBA, respectively. The adoption of fed-batch fermentation mode improved the degradation of carbon source and prevented the inhibitory effect caused by overloading of aromatic compounds. Further, both final cellular fatty acids and carotenoids contents were doubled in the fermentation of 3,4-DHBA. T. striatum HBS exhibited limited lignin depolymerization (~24 %) ability on technical lignins.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1787927
Journal Information:
Process Biochemistry, Journal Name: Process Biochemistry Vol. 107; ISSN 1359-5113
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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