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High lovastatin production by Aspergillus terreus in solid-state fermentation on polyurethane foam: An artificial inert support

Paper ID Volume ID Publish Year Pages File Format Full-Text
22055 43251 2009 6 PDF Available
Title
High lovastatin production by Aspergillus terreus in solid-state fermentation on polyurethane foam: An artificial inert support
Abstract

A novel solid-state fermentation (SSF) process, using high-density polyurethane foam (PUF) as an inert support, was developed for the production of lovastatin. Results indicated that forced aeration is not conducive to metabolite production since it reduces the solid medium's moisture content. The highest level of production was achieved in closed flasks (CF), in which 7.5 mg of lovastatin was generated per gram of dry culture, equivalent to 493 μg/mg dry mycelium. However, since mycelial growth is aeration-dependent, the CF cultures presented the lowest level of growth: 15.19 mg/gdc (milligrams per gram of dry culture). It was possible to increase the biomass concentration to 24.4 mg/gdc by increasing the culture medium concentration to 2.5× and the initial moisture content of the solid medium to 85%. Results also revealed that the density of the culture support is a key parameter in determining lovastatin production; high yields were only obtained on PUF at a density of 17 or 20 kg/m3. SSF using the latter reached a lovastatin level of 19.95 mg/gdc, with specific production of 815 μg/mg dry mycelium. A comparative study showed that lovastatin production during PUF SSF was two-fold higher than that of the better-known system of bagasse SSF. Moreover, lovastatin yields on PUF were 30 times higher than those of liquid submerged fermentation (SmF; 0.57 mg/ml) and lovastatin biomass was almost 15 times more productive.

Keywords
CF, closed flask; FLA, flasks with limited aeration; mg/gdc, milligrams per gram of dry culture; PUF, polyurethane foam; SmF, submerged fermentation; SSF, solid-state fermentationLovastatin; Production; Polyurethane foam; Artificial inert support; Solid-s
First Page Preview
High lovastatin production by Aspergillus terreus in solid-state fermentation on polyurethane foam: An artificial inert support
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Bioscience and Bioengineering - Volume 108, Issue 2, August 2009, Pages 105–110
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering