Bacillus Sporulation Process Using Optimized SBM Medium
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Solution Overview
Problem
Current methods for producing biomass and spores of plant growth-promoting bacteria from the Bacillus genus face challenges with low biomass yield and sporulation efficiency, typically not exceeding 50%, making them inefficient for large-scale production.
Innovation Solution
A process involving a suitable culture medium (SBM medium) and specific physicochemical conditions such as temperature, pH, aeration, and stirring is used to cultivate Bacillus genus microorganisms, achieving high sporulation efficiency (over 85%) and increased biomass production, suitable for large-scale production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional culture media and cultivation methods are used for Bacillus genus, then the production process is simple, but the biomass yield is low and sporulation efficiency does not exceed 50%
Solution Approach 1:
The patent optimizes specific physicochemical parameters including pH (maintained at 6.5-7.5), temperature (30-37°C), aeration rate (0.5-1.5 vvm), and stirring speed (200-400 rpm) to maximize sporulation efficiency. The SBM medium composition is precisely controlled with specific concentrations of carbon sources (20-40 g/L), nitrogen sources (5-15 g/L), and minerals to achieve over 85% sporulation efficiency while maintaining process simplicity
Solution Approach 2:
The SBM culture medium is formulated as a composite system combining multiple nutrient components: carbon sources (glucose, sucrose, starch), nitrogen sources (peptone, yeast extract, ammonium sulfate), minerals (phosphates, sulfates, chlorides), and vitamins. This composite approach creates synergistic effects that dramatically improve sporulation efficiency beyond what single nutrients can achieve
2Productivity
If conventional culture methods are used, then the manipulation steps are numerous, but the biomass production is low
Solution Approach 1:
The patent implements continuous cultivation in bioreactors maintaining optimal conditions throughout the growth phase. Aeration and stirring continue uninterrupted to ensure consistent oxygen supply and nutrient distribution, allowing biomass production to proceed continuously without batch interruptions, achieving high cell densities of 10^9-10^10 CFU/mL
Solution Approach 2:
The optimized SBM medium composition and cultivation conditions enable the Bacillus cells to automatically progress through growth phases and sporulation without external intervention. The medium provides all necessary nutrients in optimal ratios, and the controlled physicochemical environment allows cells to self-regulate their metabolism and differentiation processes
3Productivity
If existing production processes are used, then the sporulation efficiency is low (below 50%), but the process time is extended
Solution Approach 1:
The patent uses a pre-inoculum step where cells are first grown in enriched media (TSA or TSB) to activate them before transferring to SBM medium for sporulation. This preliminary activation ensures cells are in optimal physiological state for rapid sporulation, reducing the time required to achieve high sporulation efficiency and preventing lag phases that would extend production time
Solution Approach 2:
The cultivation process is structured in distinct periodic phases: activation phase in enriched media, exponential growth phase in SBM medium, and sporulation phase triggered by nutrient depletion or environmental changes. Each phase has optimized duration and conditions, allowing the system to efficiently transition through stages and achieve high sporulation in minimal time
Data Source
AI summary
The present invention refers to a process designed to increase the production of plant growth-promoting microorganisms of the Bacillus genus, using a culture medium poor in nutrients and with specific environmental conditions, allowing to obtain a greater amount of biomass and/or spores, which can be used to prepare solid or liquid compositions to be applied to plants, aiming to promote their growth and/or counteract the effect of phytopathogenic agents.