Biofertilizer Growth Medium for Nitrogen-Fixing Microorganism Culturing
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Solution Overview
Problem
The limited availability of metabolic substrates bottlenecks plant- and soil-beneficial functions, and existing bioprocesses for producing biofertilizers face challenges in maintaining cell viability during processing, storage, and transport due to non-optimal conditions.
Innovation Solution
A growth medium for nitrogen-fixing microorganisms is formulated with a compound nutrient source, a salt, a buffer, a carbon source, and a metal source, which includes ammonium magnesium phosphate hexahydrate, ferric citrate, and other soluble salts, to enhance cell density and accumulation of microbial intracellular storage compounds (MISC) like polyhydroxyalkanoates (PHA).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional culturing systems are used to produce biofertilizers, then the process is simple and cost-effective, but cell density remains low and intracellular storage compounds are not accumulated
Solution Approach 1:
The patent modifies the growth medium composition by incorporating specific intracellular storage compound precursors (polyhydroxyalkanoate monomers, polyphosphate salts, lipids) and controlling environmental parameters (aeration, agitation, feeding strategies) to induce high cell density and MISC accumulation without requiring complex bioreactor systems
Solution Approach 2:
The microorganisms utilize the provided carbon sources and energy substrates to autonomously synthesize and accumulate intracellular storage compounds, transforming external nutrients into internal reserves that enhance their viability and function without requiring external intervention or complex processing
2Quantity of substance
If high cell density cultures are achieved through repeated nutrient additions, then cell density increases, but the process becomes complex and inhibitory byproducts accumulate
Solution Approach 1:
The growth medium is pre-formulated with optimized carbon sources, energy substrates, and intracellular storage compound precursors that enable high cell density and MISC accumulation in a single batch culture, eliminating the need for repeated nutrient additions and preventing inhibitory byproduct accumulation
Solution Approach 2:
The patent optimizes the chemical composition of the growth medium, specifically the ratio of carbon sources to energy substrates and the inclusion of MISC precursors, to enable high cell density cultures without generating inhibitory metabolic byproducts, thereby changing the biochemical parameters of the system
3Reliability
If microbial intracellular storage compounds are accumulated, then cell viability and efficacy are enhanced, but the accumulation does not reliably occur under conventional culturing systems
Solution Approach 1:
The microorganisms autonomously convert provided carbon sources and energy substrates into intracellular storage compounds through their own metabolic pathways, reliably accumulating MISC without requiring complex external control systems or specialized equipment
Solution Approach 2:
The patent modifies the growth medium composition by incorporating specific intracellular storage compound precursors (polyhydroxyalkanoate monomers, polyphosphate salts, lipids) and adjusting environmental parameters to induce reliable MISC accumulation in high cell density cultures maintained under simple, conventional culturing systems
4Reliability
If supplemental metabolites are added to augment microbial viability, then cell viability increases, but non-specific metabolites can be utilized by contaminants and pathogens
Solution Approach 1:
The growth medium provides specific intracellular storage compound precursors that are selectively utilized by the target microorganisms to accumulate MISC, while the formulation and culture conditions are designed to prevent contaminants and pathogens from accessing or utilizing these specific metabolites
Solution Approach 2:
The microorganisms utilize the provided carbon sources and energy substrates to autonomously synthesize and accumulate intracellular storage compounds, transforming external nutrients into internal reserves without requiring external intervention or complex processing
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 formulation achieves high cell density cultures and enhanced accumulation of MISC, thereby enriching soils and enhancing crop yields, yield quality, and soil health, while reducing the need for synthetic fertilizers and minimizing environmental impact.
Implementation Method 1
Microorganisms require energy-dense biochemical substrates to drive their metabolic processes, including simple cell maintenance and viability, as well as the plant- and soil-beneficial functions
Data Source
AI summary
The disclosure provides a growth medium and a culturing system for a nitrogen-fixing microorganism. The disclosure also provides methods of enhancing the accumulation of a microbial intracellular storage compound (MISC) in a nitrogen-fixing microorganism. The disclosure further provides biofertilizers comprising a nitrogen-fixing microorganism, as well as methods of improving and/or maintaining crop or plant yield, yield quality, or plant aesthetics, and/or improving soil health using the biofertilizers.