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Bacterial cellulose production by fed-batch fermentation in molasses medium.
1Chemical Resources Laboratory, Tokyo Institute of Technology, R1-29-4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
Biotechnology Progress
|October 2, 2004
Summary
Optimized molasses treatment significantly boosted bacterial cellulose (BC) production by Acetobacter xylinum. Fed-batch fermentation strategies further enhanced BC yields, achieving 7.82 g/L in intermittent fed-batch and optimal rates in continuous fed-batch processes.
Area of Science:
- Biotechnology
- Microbial Production
- Biomaterials Engineering
Background:
- Bacterial cellulose (BC) is a versatile biomaterial with numerous applications.
- Optimizing BC production using cost-effective carbon sources like molasses is crucial for industrial scalability.
- Acetobacter xylinum is a key microorganism for BC biosynthesis.
Purpose of the Study:
- To enhance bacterial cellulose (BC) production by Acetobacter xylinum BPR2001 using molasses.
- To investigate the effects of molasses pre-treatment and different fermentation strategies (batch, intermittent fed-batch, continuous fed-batch) on BC yield.
- To determine optimal fermentation conditions for maximizing BC concentration.
Main Methods:
- Cultivation of Acetobacter xylinum BPR2001 in a jar fermentor.
- Molasses carbon source subjected to H2SO4-heat treatment to improve BC production.
- Comparison of batch fermentation with varying initial sugar concentrations.
- Optimization of intermittent fed-batch (IFB) and continuous fed-batch (CFB) fermentation strategies.
Main Results:
- H2SO4-heat treatment of molasses increased maximum BC concentration by 76% and the specific growth rate 2-fold.
- Batch fermentation yielded a maximum BC concentration of 5.3 g/L at an initial sugar concentration of 20 g/L.
- Intermittent fed-batch (IFB) fermentation achieved the highest BC production of 7.82 g/L with five additions of 0.2 L molasses medium.
- Continuous fed-batch (CFB) fermentation identified an optimal feeding rate of 6.3 g-sugar/h for maximum BC concentration.
Conclusions:
- H2SO4-heat treatment is an effective method for improving molasses quality for BC production.
- Fed-batch fermentation strategies, particularly intermittent fed-batch, significantly enhance BC yields compared to batch processes.
- The study provides optimized conditions for large-scale bacterial cellulose production using molasses, contributing to cost-effective biomaterial manufacturing.