Alginate Hydrogel Encapsulation for Microbial Viability
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Solution Overview
Problem
Existing methods for stabilizing beneficial microorganisms for agricultural applications, such as seed treatments, face challenges in maintaining viability and stability during storage and application due to sensitivity to temperature and humidity variations, particularly for non-spore forming bacteria and fungi.
Innovation Solution
The development of encapsulated microbial compositions using a microbe embedded in a polymeric matrix with alginate hydrogel and a divalent cation, which are processed to have low water content and increased tapped density, enhancing stability through a slower drying method with controlled evaporation rates and temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microorganisms are stored using existing formulation approaches, then they can be prepared for agricultural applications, but they lose viability during storage and shipping due to sensitivity to temperature and humidity variations
Solution Approach 1:
The patent applies encapsulation using hydrogel matrices and polymeric coatings that form flexible protective shells around microorganisms. These encapsulating structures act as physical barriers that protect the microorganisms from environmental stressors including temperature fluctuations and humidity variations during storage and shipping, thereby maintaining microbial viability while improving storage stability.
Solution Approach 2:
The patent employs composite material systems combining hydrogels (such as alginate, gelatin, or carrageenan) with polymeric matrices and cross-linking agents. These composite materials provide both structural integrity and protective functionality, creating a stable encapsulating environment that maintains microbial viability under varying storage conditions while improving overall composition stability.
2Adaptability or versatility
If non-spore forming bacteria and fungi are used for agricultural applications, then they provide beneficial functions, but they are particularly sensitive to storage and formulation conditions
Solution Approach 1:
The patent modifies physical and chemical parameters of the storage environment by using hydrogel-based encapsulating compositions with controlled water content (less than 10%, preferably less than 5%). The encapsulation process creates a protected microenvironment that maintains optimal conditions for non-spore forming bacteria and fungi, reducing their sensitivity to external storage conditions while preserving their agricultural functionality.
Solution Approach 2:
The patent creates an inert protective environment through encapsulation in hydrogel and polymeric matrices that isolate microorganisms from harmful external conditions. This encapsulated environment acts as a buffer against temperature extremes, humidity variations, and other stressors, allowing non-spore forming bacteria and fungi to maintain viability during storage while retaining their adaptability for agricultural applications.
3Duration of action of stationary object
If existing stabilization methods are used for biological materials, then some protection is provided, but long-term stability at varying temperatures and humidity is not achieved
Solution Approach 1:
The patent applies preliminary protective action by pre-encapsulating microorganisms in hydrogel and polymeric matrices before storage. This pre-protection through encapsulation with cross-linking agents establishes a stable protective structure in advance, enabling the microorganisms to withstand long-term storage conditions and varying temperatures and humidity without losing viability or stability.
Solution Approach 2:
The patent provides beforehand cushioning by using hydrogel-based encapsulating compositions that create a protective buffer around microorganisms. This cushioning effect absorbs and mitigates the impact of environmental stressors including temperature fluctuations and humidity variations during long-term storage, thereby maintaining microbial stability and reliability over extended periods.
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 encapsulated microbial compositions demonstrate improved stability, with minimal loss of colony-forming units over extended periods at varying conditions, making them suitable for long-term storage and effective application in agricultural settings.
Implementation Method 1
solidifying the precursor mixture with a cross-linking agent to form an intermediate microbial composition
Implementation Method 2
drying the intermediate microbial composition to form the encapsulated microbial composition. The drying can be performed at a drying temperature of greater than or equal to about 15° C. with an evaporation rate of less than or equal to about 25,000 g/hr/m2
Data Source
AI summary
Encapsulated microbial compositions with increased stability, which, for example, can be applied to a plant seed to promote growth and/or provide pest control, and methods for preparing such encapsulated microbial compositions with increased stability are described. The method can include combining a microbe and at least one hydrogel, such as an alginate, to form a precursor mixture, solidifying the precursor mixture with a cross-linking agent including a divalent cation, a divalent cation salt, or a combination thereof to form an intermediate microbial composition, and drying the intermediate microbial composition to form the encapsulated microbial composition.