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Enhanced production of exopolysaccharides by supplementation of toluene in submerged culture of an edible mushroom Collybia maculata TG-1

Paper ID Volume ID Publish Year Pages File Format Full-Text
36425 45132 2006 7 PDF Available
Title
Enhanced production of exopolysaccharides by supplementation of toluene in submerged culture of an edible mushroom Collybia maculata TG-1
Abstract

The exopolysaccharides (EPS) production in an edible mushroom Collybia maculata was substantially increased by supplementation of organic solvents into the medium. Among the organic solvents tested as stimulating agents, 0.3% (v/v) toluene gave maximum EPS production (3.81 g/l) when supplemented at the late growth phase, by which the EPS production increased by 86% in flask cultures. This result was similarly reproduced in a bioreactor, where the maximum EPS concentration indicated 3.94 g/l after 4.5 d. A prolonged culture time after supplementation of toluene (preferably 12 h in this study) resulted in additional enhancement in EPS production (max. 4.12 g/l). The compositional analysis of the EPS produced before and after toluene treatment revealed that the EPS did not contain significant amounts of other intracellular polymeric substances. The microscopic observations evidenced that a distinct morphological difference existed between the cells before and after toluene treatment. The altered outer cell structure, as observed from transmission electron microscope (TEM) appears to be the most likely explanation for the increased EPS production in toluene-treated culture. The solvent-assisted fermentation strategy presented in this study may be worth attempting with other mushroom fermentation processes for enhancing production of EPS, particularly those with industrial potential.

Keywords
Collybia maculata; Exopolysaccharide; Morphology; Mushroom; Submerged culture; Toluene supplementation
First Page Preview
Enhanced production of exopolysaccharides by supplementation of toluene in submerged culture of an edible mushroom Collybia maculata TG-1
Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 41, Issue 7, July 2006, Pages 1620–1626
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering