Methylobacterium Fermentation Using Solid-Phase Inoculum Expansion
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Solution Overview
Problem
Existing methods for producing Methylobacterium bacteria are inefficient, requiring long production times and using costly components, and there is a need for improved fermentation processes to enhance bacterial yields and applications in plant growth promotion and bioremediation.
Innovation Solution
A method for culturing Methylobacterium involves the use of a liquid phase and a solid phase that can be suspended in a liquid phase comprising a solid phase that provides for growth of the Methylobacterium and wherein the media is essentially free of contaminating microorganisms. In certain embodiments, the solid substance is an agriculturally acceptable adjuvant or agriculturally acceptable excipient. In certain embodiments, the solid phase comprises a polysaccharide, a chitinous polysaccharide, a salt crystal, or a polysaccharide, and the polysaccharide is selected from the group of a cellulosic polysaccharide, a chitinous polysaccharide, and a galactan polysaccharide. In certain embodiments, the Methylobacterium are at a titer of at least about 5×108 colony-forming units per milliliter to at least about 6×1010 colony-forming units per milliliter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional liquid-phase fermentation methods are used to produce Methylobacterium, then the production process is simple to operate, but the production time is long and the bacterial yield is low
Solution Approach 1:
The fermentation process is segmented into two distinct phases: a solid-phase initial fermentation that generates high cell density, followed by a liquid-phase expansion phase that multiplies the biomass. This segmentation allows each phase to optimize for its specific function, resolving the contradiction between production speed and yield.
Solution Approach 2:
The solid-phase fermentation is performed as a preliminary action to generate a concentrated inoculum before transitioning to liquid-phase fermentation. This preliminary high-cell-density culture serves as the foundation for subsequent large-scale production, significantly reducing the time required to achieve high yields.
2Productivity
If expensive components are used in the culture medium, then the bacterial growth and yield are improved, but the production cost increases
Solution Approach 1:
The invention uses inexpensive, readily available materials such as molasses, corn steep liquor, and other agricultural byproducts as culture medium components. These cheap substrates replace expensive defined media components while maintaining high bacterial yields, directly addressing the cost-yield contradiction.
Solution Approach 2:
The culture medium composition is optimized by adjusting parameters such as carbon-to-nitrogen ratio, pH, and aeration conditions to maximize bacterial growth on inexpensive substrates. This parameter optimization enables high yields without requiring expensive media components.
3Quantity of substance
If high cell density is achieved through extended fermentation, then the bacterial yield increases, but the risk of contamination and metabolic stress increases
Solution Approach 1:
The fermentation is segmented into solid-phase and liquid-phase stages, with the solid phase achieving high cell density under controlled conditions and the liquid phase serving as a fresh, sterile expansion medium. This segmentation resets the cultural conditions, reducing contamination risk and metabolic stress while maintaining high yields.
Solution Approach 2:
The solid-phase fermentation serves as a preliminary step to generate high cell density inoculum under optimal controlled conditions. By completing the density-building phase first in a controlled solid medium, the subsequent liquid phase can focus on expansion without the same contamination risks, maintaining both high concentration and culture health.
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
The method significantly reduces production time and enhances Methylobacterium yields, allowing for high-titer cultures and efficient application in plant growth promotion, bioremediation, and production of valuable products such as poly-3-hydroxy butyric acid, 1,3-propanediol, and oxazopyrroloquinolines.
Implementation Method 1
Methanotrophs possess the enzyme methane monooxygenase, that incorporates an atom of oxygen from O2 into methane, forming methanol
Implementation Method 2
a solid phase that provides for growth of the Methylobacterium
Data Source
AI summary
The present invention provides methods for the cultivation of the Methylobacterium genus of bacteria. In particular the method provides methods for the efficient and inexpensive cultivation of these bacteria. Additionally, the invention provides methods for the utilization of these bacterial cultures to improve plant agriculture.