Protective Dry Powder Matrix for Stable Microorganism Drying
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Solution Overview
Problem
Existing drying processes for bioactive microorganisms and materials, such as live bacteria and viruses, are inefficient and unsuitable for industrial scale due to high temperatures, foam expansion, and ice crystal formation, leading to viability loss and instability under high temperature and humid conditions.
Innovation Solution
A formulation comprising a bioactive microorganism or material, a stabilizer agent, and a protective agent is prepared in a solution, cooled above its freezing temperature, and dried under vacuum with controlled expansion and elevated temperature to achieve a water activity of 0.3 or less, using a combination of primary and secondary drying steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If freeze-drying is used to preserve bioactive microorganisms, then stability during storage is improved, but energy consumption increases and drying time extends due to sub-zero temperature requirements
Solution Approach 1:
The invention changes the temperature parameter from sub-zero (freeze-drying) to above-freezing temperatures. The formulation allows drying at temperatures above the freezing point of water while maintaining stability, thereby reducing energy consumption and drying time while preserving bioactivity.
Solution Approach 2:
The invention uses a composite formulation containing stabilizer agents (such as sugars, proteins, or polymers) combined with the bioactive microorganisms. This composite structure protects the microorganisms during drying and storage, enabling stable preservation at above-freezing temperatures without requiring energy-intensive freeze-drying.
2Productivity
If spray drying or supercritical fluid drying is used to reduce drying time, then productivity improves, but high drying temperatures cause significant damage to the microorganisms
Solution Approach 1:
The invention optimizes the temperature parameter to a specific range above freezing but below the threshold for thermal damage. This allows rapid drying without the high temperatures that cause microorganism death, achieving both high productivity and preservation of bioactivity.
Solution Approach 2:
The stabilizer agent acts as an intermediary between the microorganisms and the drying environment. It forms a protective matrix that shields the microorganisms from thermal stress during rapid drying, enabling high productivity without thermal damage.
3Device complexity
If conventional vacuum drying is used to simplify the process, then device complexity reduces, but ice crystal formation occurs which damages the microorganisms
Solution Approach 1:
The invention performs preliminary protection of the microorganisms by incorporating stabilizer agents into the formulation before drying. This preliminary action prevents ice crystal formation and associated damage during vacuum drying, allowing simple equipment to be used without compromising microorganism integrity.
Solution Approach 2:
The stabilizer agent formulation acts as a disposable protective layer that is consumed during the drying process to prevent damage. This allows the use of simple, inexpensive vacuum drying equipment rather than complex freeze-drying systems, reducing device complexity while preventing ice crystal damage.
4Reliability
If cryoprotective agents are added to reduce ice crystal formation, then microorganism protection improves, but the agents may not penetrate adequately into cells to protect intracellular components
Solution Approach 1:
The invention uses a composite formulation with multiple stabilizer agents that work synergistically. The combination includes agents that protect extracellular structures and agents that can penetrate cells to protect intracellular components, achieving comprehensive protection without relying on a single agent.
Solution Approach 2:
The formulation contains different stabilizer agents with different properties tailored for different locations: some agents protect the cell membrane and extracellular environment, while others are designed to penetrate and protect intracellular components. This local quality approach ensures adequate protection throughout the entire cell structure.
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 results in a stable dry composition with minimal viability loss, enabling industrial scalability and extended storage stability under harsh conditions, retaining bioactivity for bioactive materials and microorganisms.
Implementation Method 1
cooled above its freezing temperature
Implementation Method 2
dried under vacuum with controlled expansion
Implementation Method 3
dried under vacuum
Implementation Method 4
supplying heat to the composition
Data Source
AI summary
The present invention relates to embedding live or dead microorganisms and/or bioactive materials in a protective dry formulation matrix, wherein the formulation includes the bioactive microorganism or material, a formulation stabilizer agent, and a protective agent. The formulation is prepared by dispersing all the solid components in a solution, with or without a vacuum, and cooling the solution to a temperature above its freezing temperature. The methods include a primary drying step of the formulation at a desired temperature and time period, and an accelerated secondary drying step under maximum vacuum and elevated temperature, to achieve a final desirable water activity of the dry material.