Sweetpotato vines hydrolysate promotes single cell oils production of Trichosporon fermentans in high-density molasses fermentation

Bioresour Technol. 2015 Jan:176:249-56. doi: 10.1016/j.biortech.2014.11.045. Epub 2014 Nov 15.

Abstract

This study investigated the co-fermentation of molasses and sweetpotato vine hydrolysate (SVH) by Trichosporon fermentans. T. fermentans showed low lipid accumulation on pure molasses; however, its lipid content increased by 35% when 10% SVH was added. The strong influence of SVH on lipid production was further demonstrated by the result of sensitivity analysis on effects of factors based on an artificial neural network model because the relative importance value of SVH dosage for lipid production was only lower than that of fermentation time. Scanning electron microscope observation and flow cytometry of yeast cells grown in culture with and without SVH showed that less deformation cells were involved in the culture with SVH. The activity of malic enzyme, which plays a key role in fatty acid synthesis, increased from 2.4U/mg to 3.7U/mg after SVH added. All results indicated SVH is a good supplement for lipid fermentation on molasses.

Keywords: Artificial neural network; Molasses; Single cell oils (SCOs); Sweetpotato vines hydrolysate; T. fermentans.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bioreactors
  • Fermentation
  • Flow Cytometry
  • Ipomoea batatas / chemistry*
  • Lipid Metabolism
  • Microscopy, Electron, Scanning
  • Molasses*
  • Neural Networks, Computer
  • Trichosporon / metabolism*
  • Trichosporon / ultrastructure