Dry Microbial Cell Powder Stabilization via Carbohydrate Addition
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Solution Overview
Problem
The industrial production and storage of β-galactosidase from Sporobolomyces singularis are hindered by the enzyme's tight binding to cell walls, leading to high costs and contamination risks due to the need for dilute microbial cell liquids, which are difficult to store and distribute effectively.
Innovation Solution
A method involving the addition of carbohydrates to microbial cell liquids before spray drying or lyophilization to maintain enzymatic activity, resulting in a stable dry microbial cell powder that can be stored for extended periods without significant enzyme titer loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If dilute microbial cell liquid is used to supply β-galactosidase, then the enzyme can be utilized, but storage and distribution costs increase significantly due to high water content
Solution Approach 1:
The patent applies freeze-drying (lyophilization) to transform the microbial cell liquid from liquid phase to solid phase, removing water while preserving enzymatic activity. This phase transition enables long-term storage and reduces distribution costs by eliminating the need to transport large volumes of water-containing liquid.
Solution Approach 2:
The patent adds stabilizing agents (carbohydrates, proteins, or mixtures) to the microbial cell liquid before drying. This preliminary action protects the enzyme structure and maintains catalytic activity during the drying process and subsequent storage, preventing enzyme denaturation and loss of function.
2Ease of manufacture
If dilute microbial cell liquid is used, then the enzyme is available, but long-term storage is difficult and microbial contamination risk increases
Solution Approach 1:
Freeze-drying transforms the liquid into a stable solid form with extremely low moisture content, creating an environment where microbial growth is inhibited and enzyme structure is preserved. This phase change enables storage at room temperature for extended periods without contamination risk.
Solution Approach 2:
Stabilizing agents are added before drying to form a protective matrix around the enzyme molecules. This preliminary protection prevents enzymatic inactivation and maintains structural integrity during storage, ensuring long-term reliability and preventing contamination.
3Ease of manufacture
If β-galactosidase is purified from cell walls, then the enzyme can be utilized, but the process becomes technologically difficult and costly
Solution Approach 1:
Instead of extracting and purifying the enzyme from cell walls, the patent takes out the entire microbial cell and stabilizes it in dry form. This approach eliminates the complex purification steps while maintaining enzyme availability, as the enzyme remains functional within the stabilized cellular structure.
Solution Approach 2:
The patent creates a composite system where the microbial cell, stabilizing agents (carbohydrates, proteins), and enzyme form a stable integrated structure. This composite approach allows the enzyme to function effectively without requiring separation from cellular components, simplifying the manufacturing process.
4Reliability
If demand-led production is used to avoid contamination, then contamination risk decreases, but production efficiency and cost-effectiveness are reduced
Solution Approach 1:
Freeze-drying transforms the product into a stable solid form that can be stored indefinitely without contamination. This enables bulk production ahead of demand, as the dried product maintains its integrity and prevents microbial growth during storage, eliminating the need for demand-led production schedules.
Solution Approach 2:
Stabilizing agents are added before drying to ensure long-term stability and contamination resistance. This preliminary stabilization allows the product to be produced in advance and stored safely, improving production efficiency by decoupling production timing from consumption timing.
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 allows for long-term storage of microbial cell powders with maintained enzymatic activity, reducing distribution costs and avoiding contamination issues, enabling efficient production and use in oligosaccharide production without practical problems.
Implementation Method 1
by adding a carbohydrate to a microbial cell liquid in advance, and then spray drying the liquid
Implementation Method 2
the enzymatic activity of a microorganism can be maintained for a long period of time in a state where dry microbial cells and a carbohydrate coexist
Data Source
AI summary
An object of the present invention is to develop a means capable of maintaining the enzymatic activity of a microorganism even in a dry state. Provided is a method for producing a dry microbial cell powder maintaining an enzyme titer, characterized by comprising adding a carbohydrate to a liquid of microbial cells having an enzymatic activity and then drying the liquid. Also provided is a dry microbial cell powder obtained by the method.