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Efficient production of sophorolipids by Starmerella bombicola using a corncob hydrolysate medium

Paper ID Volume ID Publish Year Pages File Format Full-Text
20410 43173 2015 6 PDF Available
Title
Efficient production of sophorolipids by Starmerella bombicola using a corncob hydrolysate medium
Abstract

Sophorolipids (SLs) are amphiphilic compounds produced from a variety of saccharides and vegetable oils by the yeast Starmerella bombicola and related strains, and they have commercial uses as detergents. In the present study, SL production was investigated using a corncob hydrolysate (CCH) medium derived from lignocellulosic feedstocks as a source of hydrophilic carbon substrates. Excess sulfuric acid concentrations during pretreatment of the corncobs increased the furfural concentrations and turned the CCH dark brown. The optimal sulfuric acid concentration was 1% (w/v), and the treated CCH, containing 45 g/l glucose, allowed the production of 33.7 g/l of SLs following 4 days of cultivation. Additional autoclaving (121°C, 20 min) inhibited SL production and cell growth by 36% and 40%, respectively. Ammonium nitrate (0.1 g-N/l) restored SL production to the autoclaved CCH. Finally, a cost-effective SL production of 49.2 g/l, with a volumetric productivity of 12.3 g/l/day, was achieved using CCH medium during batch cultivation in a jar fermentor.

Keywords
Lignocellulosic biomass; Biosurfactant; Corncob hydrolysate; Surface-active glycolipid; Sophorolipids; Starmerella bombicola
First Page Preview
Efficient production of sophorolipids by Starmerella bombicola using a corncob hydrolysate medium
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Bioscience and Bioengineering - Volume 119, Issue 3, March 2015, Pages 317–322
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering