title: Selective production of cis-9,trans-11 isomer of conjugated linoleic acid from trans-vaccenic acid methyl ester by Delacroixia coronata.
abstract: OBJECTIVE
  Bio-process development for isomer selective and efficient production of cis-9,trans-11-octadecadienoic acid (CLA) from trans-vaccenic acid (t-VA, trans-11-octadecenoic acid) through microbial fatty acid Delta9-desaturation reaction.
  
  
  RESULTS
  A total of 550 strains of fungi and yeasts were screened for CLA production from t-VA through Delta9 desaturation. Delacroixia coronata IFO 8586 was selected as a potent producer of CLA from t-VA. Efficient CLA production was observed during cultivation in medium supplemented with the methyl ester of t-VA (t-VAME). Under the optimal conditions with 33.3 mg ml(-1) of t-VAME as substrate, 10.5 mg ml(-1) CLA was produced by D. coronata IFO 8586 after 7 days of cultivation in the medium containing dextrin (5.0%), tryptone (2.0%) and thiourea (0.83 micromol ml(-1)). The strain produced the cis-9,trans-11 isomer of CLA selectively (98% of total CLA), with a small amount of the trans-9,trans-11 isomer (2% of total CLA), mainly in the form of triacylglycerols (69% of total CLA).
  
  
  CONCLUSIONS
  A practical bio-process for selective production of cis-9,trans-11 isomer of CLA using filamentous fungus D. coronata IFO 8586 was successfully established.
  
  
  CONCLUSIONS
  Isomer selective bio-process for the practical production of cis-9,trans-11-CLA was first established. The process is benefitable for expanding the application of CLA for medicinal and nutraceutical purposes.
authors.affiliation: Laboratory of Fermentation Physiology and Applied Microbiology, Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Ando
authors.forename: J
authors.initials: J
authors.lastname: Ogawa
authors.forename: S
authors.initials: S
authors.lastname: Sugimoto
authors.forename: S
authors.initials: S
authors.lastname: Kishino
authors.forename: E
authors.initials: E
authors.lastname: Sakuradani
authors.forename: K
authors.initials: K
authors.lastname: Yokozeki
authors.forename: S
authors.initials: S
authors.lastname: Shimizu
mesh_terms: D003470:Culture Media; D005658:Fungi / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007536:Isomerism; D044243:Linoleic Acids, Conjugated / Q000737:chemistry / Q000378:metabolism*; D009829:Oleic Acids / Q000737:chemistry / Q000378:metabolism*; D013696:Temperature; D013997:Time Factors
chemical_list: D003470:Culture Media; D044243:Linoleic Acids, Conjugated; D009829:Oleic Acids; C050413:11-octadecenoic acid