Related Experiment Video
Updated: Aug 12, 2026
14:53
Techniques for the Evolution of Robust Pentose-fermenting Yeast for Bioconversion of Lignocellulose to Ethanol
Published on: October 24, 2016
Optimization of glycerol fed-batch fermentation in different reactor states: a variable kinetic parameter approach
Dongming Xie1, Dehua Liu, Haoli Zhu
1Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing, PR China.
Applied Biochemistry and Biotechnology
|June 7, 2002
Summary
Optimizing glycerol fermentation using a variable kinetic parameter (VKP) approach improved productivity by 27%. This method accurately models different bioreactor states for enhanced bioprocess optimization.
Area of Science:
- Biotechnology
- Biochemical Engineering
- Process Optimization
Background:
- Fed-batch fermentation is crucial for bioprocesses like glycerol production.
- Accurate modeling is essential for optimizing reactor performance and productivity.
- Previous models struggled to account for variations across different reactor states.
Purpose of the Study:
- To optimize fed-batch glycerol fermentation across various reactor types.
- To adapt a macrokinetic model using a variable kinetic parameter (VKP) approach.
- To enhance discrete-pulse feeding (DPF) strategies for improved glycerol yield.
Main Methods:
- Investigated glycerol fermentation in shaking flasks and airlift/stirred tank reactors.
- Reestimated two key kinetic parameters related to physical transport phenomena.
- Applied the VKP approach to optimize DPF strategies for glucose and corn steep slurry.
Main Results:
- The VKP approach successfully modeled glycerol fermentation in diverse reactor states.
- Optimized DPF strategies using VKPs increased glycerol productivity by at least 27%.
- Improvements were observed in both scale-down and scale-up reactor conditions.
Conclusions:
- The VKP approach provides a robust method for modeling glycerol fermentation across different reactors.
- Model-based optimization using VKPs significantly enhances bioprocess efficiency.
- This strategy shows promise for scaling up and optimizing similar bioprocesses.
Related Concept Videos
01:18Bioreactor Controls-II
In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the fermentor via a sparger...
01:22Bioreactor Controls-III
Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...
01:28Methods of Medium Optimization
Optimizing growth media enhances microbial proliferation and maximizes product yield. Statistical experimental design methodologies provide structured and reproducible approaches, offering progressively higher levels of robustness and efficiency.The One-Factor-at-a-Time (OFAT) MethodThe One-Factor-at-a-Time (OFAT) method involves adjusting a single variable while keeping all others constant. However, it cannot detect interactions between variables, often leading to suboptimal outcomes when...
01:14Batch vs Continuous Culture
Fermentation is a foundational biotechnological process used to produce pharmaceuticals, biofuels, enzymes, and food additives. Among industrial strategies, batch and continuous fermentation are the two most widely applied. Although both rely on microbial conversion of substrates into desired products, they differ markedly in operation, productivity, and suitability for specific applications.Batch fermentation occurs in a closed system in which nutrient media and inoculum are added at the...
01:23Fed-Batch Culture
Fed-batch culture is a widely used bioprocessing strategy combining aspects of batch culture with controlled substrate feeding to optimize cell growth and product formation. In this semi-closed system, nutrients are strategically added during fermentation, while the accumulated products and biomass remain within the bioreactor until the end of the operation. This controlled addition of substrates allows for better management of growth kinetics, nutrient limitation, and metabolite...
01:27Production of Alcohol
Continuous fermentation is a key strategy in industrial ethanol production, particularly when efficiency, scalability, and high yields are essential. This approach allows for uninterrupted operation and optimized resource utilization. The primary feedstock, corn starch, undergoes enzymatic hydrolysis facilitated by α-amylase and glucoamylase. These enzymes break down the starch into fermentable sugars such as glucose, which are readily assimilated by fermentative microorganisms.Fermentation...