Fermentation Temperature Control for 2-Butanol Yield
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Solution Overview
Problem
Current methods for producing 2-butanol by fermentation are limited by the toxicity of the product to the microbial host, leading to lower yields and higher production costs, and there is a need for a more robust and cost-effective process.
Innovation Solution
A method involving a recombinant microbial host that undergoes a decrease in temperature during fermentation, enhancing the host's tolerance to 2-butanol and increasing production yields by seeding the host into a fermentation medium, growing it at an initial temperature, and then lowering the temperature to optimize 2-butanol production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fermentation is conducted at constant temperature using recombinant microbial host, then fermentation process is simple to operate, but host tolerance to 2-butanol is low resulting in limited production yield
Solution Approach 1:
The patent applies dynamic temperature control during fermentation, transitioning from a constant temperature regime to a dynamic regime where temperature is adjusted in response to 2-butanol concentration and host tolerance levels. This resolves the contradiction by making the fermentation process adaptive rather than static, allowing simple operation to coexist with improved productivity through automated or controlled temperature adjustments.
Solution Approach 2:
The patent changes the temperature parameter during fermentation based on 2-butanol concentration and host tolerance. By dynamically adjusting this physical parameter, the system overcomes the limitation of constant temperature operation, enabling higher productivity while maintaining operational simplicity through parameter-based control strategies.
2Productivity
If higher 2-butanol concentrations are produced, then production efficiency increases, but host toxicity from 2-butanol increases limiting further production
Solution Approach 1:
The patent applies preliminary anti-action by anticipating host toxicity before it becomes limiting. Through dynamic temperature control, the system preemptively adjusts conditions to maintain host tolerance as 2-butanol accumulates, counteracting the harmful effect before it severely impacts production. This allows higher concentrations to be achieved by preventing toxicity from becoming the limiting factor.
Solution Approach 2:
The patent converts the harmful effect of 2-butanol accumulation into a beneficial control signal. The increasing 2-butanol concentration, which would normally be harmful, triggers temperature adjustments that enhance host tolerance. Thus, the harmful accumulation is transformed into a feedback mechanism that drives process optimization and enables higher final concentrations.
3Productivity
If temperature is decreased during fermentation to enhance host tolerance, then 2-butanol production yield increases, but fermentation process complexity increases
Solution Approach 1:
The patent implements feedback control where 2-butanol concentration and host tolerance measurements inform temperature adjustment decisions. This feedback mechanism automates the complex temperature management, reducing the perceived complexity for operators while achieving higher yields. The system self-regulates based on measured parameters, transforming manual complexity into automated control.
Solution Approach 2:
The fermentation system performs self-service through automated temperature adjustment based on 2-butanol concentration and host tolerance. Rather than requiring continuous manual intervention to manage temperature complexity, the system monitors its own state and makes appropriate adjustments, enabling high productivity while keeping operational complexity manageable through self-regulation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in higher titers of 2-butanol production by reducing host sensitivity to the product, thereby overcoming toxicity limitations and achieving more efficient and cost-effective commercial production.
Implementation Method 1
production of 2-butanol by fermentation using a recombinant microbial host
Implementation Method 2
employing a decrease in temperature during fermentation that results in more robust tolerance of the production host to the 2-butanol product
Data Source
AI summary
A method for the production of 2-butanol by fermentation using a microbial production host is disclosed. The method employs a reduction in temperature during the fermentation process that results in a more robust tolerance of the production host to the butanol product.