Capillary-Assisted Vitrification for Biological Materials
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Solution Overview
Problem
Current methods for non-cryogenic vitrification of biological materials face challenges such as high concentrations of cryoprotectants, slow and non-uniform desiccation rates, and cellular injury due to osmotic stress during drying.
Innovation Solution
A method involving capillary-assisted fast drying using a vitrification composition comprising trehalose, glycerol, and an ionic buffer with large organic ions, along with a device featuring capillary channels for uniform moisture removal, enabling rapid and uniform vitrification of biological materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If evaporative drying of sessile droplets is used for desiccation, then the process is simple to operate, but the desiccation rate is slow and non-uniform
Solution Approach 1:
The invention uses a porous substrate with controlled pore size and distribution to enable capillary-driven water transport. The porous structure provides large surface area for evaporation while maintaining uniform water supply to the droplet, achieving both fast and uniform desiccation rates without complex equipment
Solution Approach 2:
The invention utilizes capillary action (a hydraulic principle) where the porous substrate's capillary forces automatically draw water from the droplet to the evaporation interface. This passive fluid transport mechanism eliminates the need for external pumps or complex control systems, maintaining ease of operation while dramatically increasing desiccation rate
2Reliability
If a glassy skin forms at the liquid/vapor interface during desiccation, then protection against degradation is provided, but further desiccation is slowed and spatial non-uniformity is induced
Solution Approach 1:
The porous substrate creates local quality variations in the droplet by providing preferential evaporation pathways through the substrate pores. This ensures uniform water removal from the entire droplet volume rather than allowing skin formation at the top surface, maintaining both high desiccation rate and spatial uniformity
Solution Approach 2:
The invention transitions the evaporation process from a surface phenomenon (droplet top interface) to a volumetric process by allowing water to escape through the porous substrate from throughout the droplet volume. This dimensional change prevents skin formation and enables uniform desiccation
3Productivity
If cells are exposed to prolonged osmotic stress during dry processing, then desiccation can be achieved, but cellular injury and degradation occur
Solution Approach 1:
The capillary-assisted desiccation method rapidly removes water from the droplet, quickly passing through the critical intermediate moisture content range where osmotic stress is most damaging. The fast desiccation rate minimizes the time cells are exposed to harmful osmotic conditions while still achieving complete vitrification
4Reliability
If high concentrations of cryoprotectants (6-8M) are used to avoid ice-nucleation, then vitrification is achieved, but toxic effects on cells occur and complex protocols are required
Solution Approach 1:
The invention changes the key parameter from cryoprotectant concentration to desiccation rate. By controlling the drying process through capillary action in a porous substrate, the method achieves vitrification at much lower CPA concentrations (0.5-2M), eliminating toxic effects while simplifying the protocol to a single-step process
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
This approach achieves fast and uniform desiccation, preserving the structural integrity of biological materials and maintaining cell viability, thereby facilitating long-term storage at non-cryogenic temperatures.
Implementation Method 1
desiccating away the vitrification mixture by capillary action until the vitrification mixture enters into a glassy state
Implementation Method 2
vitrification of biological materials by capillary assisted fast drying
Data Source
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AI summary
Disclosed are devices and methods for non-cryogenic vitrification of biological materials that include the steps of providing a plurality of capillary channels of which a first opening is operably in contact with a moisture containing vitrification mixture made of a biological material and a vitrification agent. The capillary absorbs and transports the moisture to the second opening through capillary action, and the moisture is subsequently evaporated into a surrounding low humidity atmosphere until the vitrification mixture enters into a vitrified state.