Application of oil refinery waste in the biosynthesis of glycolipids by yeast

Bioresour Technol. 2004 Oct;95(1):15-8. doi: 10.1016/j.biortech.2004.01.009.

Abstract

Candida antarctica or Candida apicola synthesized surfactants (glycolipids) in the cultivation medium supplemented with oil refinery waste, either with soapstock (from 5.0% to 12.0% v/v) or post-refinery fatty acids (from 2.0% to 5.0% v/v). The efficiency of glycolipids synthesis was determined by the amount of waste supplemented to the medium and was from 7.3 to 13.4 g/l and from 6.6 to 10.5 g/l in the medium supplemented with soapstock and post-refinery fatty acids, respectively. The studied yeast also synthesized glycolipids in the non-supplemented medium however, by the enrichment of medium with the oil refinery waste, a 7.5-8.5-fold greater concentration of glycolipids was obtained in the post-culture liquid then in the medium without addition of oil refinery waste. The yeast synthesized from 6.6 to 10.3 g dry biomass/l and the intra-cellular fat content was from 16.8% to 30.2%. The efficiency of glycolipids synthesis was determined by yeast species, medium acidity and culture period. The surface tension of the post-culture liquid separated from yeast biomass was reduced to 35.6 mN/m, which corresponded to the surface tension obtained at the critical micelle concentration of glycolipids.

MeSH terms

  • Candida / metabolism*
  • Culture Media
  • Fatty Acids / metabolism
  • Glycolipids / biosynthesis*
  • Industrial Microbiology / methods*
  • Industrial Waste*
  • Petroleum / metabolism*
  • Soaps / metabolism
  • Surface Properties
  • Surface-Active Agents / chemistry

Substances

  • Culture Media
  • Fatty Acids
  • Glycolipids
  • Industrial Waste
  • Petroleum
  • Soaps
  • Surface-Active Agents