DSC Thermal Analysis for Electric Field Cryopreservation
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Solution Overview
Problem
Current methods for biological material cryopreservation, such as rapid cooling and cryoprotectant addition, face challenges like uneven cooling rates, operational complexity, and toxicity, and lack effective real-time monitoring and quantitative analysis of ice crystal formation during low-temperature freezing, which limits their applicability, especially for large-sized materials.
Innovation Solution
A Differential Scanning calorimetry (DSC) thermal analysis method that embeds electrodes in a crucible to monitor heat flow changes during freezing and reheating under an applied electric field, generating DSC curves and calculating phase transformation rates using dielectric and thermodynamic theories to optimize electric field parameters for inhibiting ice crystal formation and improving cryopreservation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If rapid cooling method is used, then cooling speed is improved, but cooling uniformity deteriorates
Solution Approach 1:
The patent segments the cooling process into multiple stages with different cooling rates. The cooling process is divided into rapid cooling stage, intermediate cooling stage, and slow cooling stage, allowing each stage to optimize for its specific purpose while maintaining overall cooling uniformity throughout the biological material.
Solution Approach 2:
The patent implements periodic temperature adjustments during the cooling process, alternating between rapid cooling periods and stabilization periods. This periodic action allows the system to achieve high cooling speeds while periodically correcting temperature gradients to maintain uniformity.
2Object-affected harmful factors
If cryoprotectant adding method is used, then ice crystal formation is inhibited, but operational complexity increases
Solution Approach 1:
The patent extracts and removes the need for cryoprotectant chemicals by replacing the chemical protection method with a physical method - controlled electric field application during freezing. This eliminates the complexity of cryoprotectant addition, mixing, and removal while maintaining ice crystal inhibition.
Solution Approach 2:
The patent substitutes the chemical mechanism (cryoprotectants) with an electric field mechanism to achieve the same protective effect. The electric field controls water molecule orientation and freezing behavior, replacing the need for chemical additives and simplifying the overall process.
3Object-affected harmful factors
If cryoprotectant adding method is used, then ice crystal formation is inhibited, but toxicity increases
Solution Approach 1:
The patent completely removes toxic cryoprotectant chemicals from the cryopreservation process by using electric field control instead. This extraction of harmful chemicals eliminates toxicity while maintaining the protective function against ice crystal formation.
Solution Approach 2:
The patent converts the normally harmful effect of electric fields into a beneficial protective mechanism. By applying controlled electric fields during freezing, the system protects biological materials from ice crystal damage without introducing chemical toxins, turning a potential stressor into a protective agent.
4Illumination intensity
If microscopic observation method is used, then ice crystal visualization is improved, but measurement precision deteriorates
Solution Approach 1:
The patent replaces the optical observation system with a thermal measurement system. Instead of visually observing ice crystals through microscopes, the system uses differential scanning calorimetry to precisely measure heat flow changes during freezing, providing quantitative data on ice crystal formation and phase transformation.
Solution Approach 2:
The patent introduces thermal energy measurement as an intermediary to indirectly observe and quantify ice crystal formation. The differential scanning calorimeter measures heat flow as an intermediary parameter that directly correlates with phase transformation, providing precise quantitative information without the limitations of direct visual observation.
5Measurement precision
If DSC thermal analysis method is used, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent enhances the differential scanning calorimeter with multi-functionality, enabling it to perform both traditional thermal analysis and electric field-controlled freezing analysis. The instrument can apply electric fields, control temperature programs, and measure heat flow, combining multiple functions in a single platform that justifies the increased complexity through expanded capabilities.
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 method allows for real-time monitoring and accurate calculation of heat flow changes, providing a theoretical basis for optimizing electric field parameters to reduce ice crystal damage and enhance cryopreservation efficiency, particularly for large biological tissues.
Implementation Method 1
Since water molecules are polar molecules, they will generate dipole polarization under the action of an applied electromagnetic field. This polarization effect will interfere with the balance of water molecule clusters, and then affect the liquid-solid phase change property of the water molecules.
Implementation Method 2
Differential Scanning calorimetry (DSC) can measure a relationship between heat flows and temperatures of input and output samples and a reference when a tested sample is heated, cooled or at a constant temperature.
Implementation Method 3
Studies have shown that the application of an appropriate electromagnetic field can inhibit the crystallization of the water molecules in the biological tissues to a certain extent, thereby reducing the degree of damage to the biological materials caused by low-temperature freezing.
Data Source
AI summary
A Differential Scanning calorimetry (DSC) thermal analysis method for the action of an applied electric field includes: step 1, in an experiment module of a differential scanning calorimeter, placing a microelectrode crucible and a reference crucible on corresponding sensors, connecting electrode wires of the microelectrode crucible with a signal generator, setting signal parameters to be output, placing a tested sample in a gap between electrodes, closing a microelectrode crucible lid, and closing the experiment module; step 2, at a temperature-varying stage, measuring a DSC curve of the tested sample under the action of an electric field, and at a reheating stage, measuring a DSC curve of the tested sample with no electric field; and step 3, analyzing the DSC curves in combination with the related theories of dielectrics and thermodynamics, and calculating an electric field intensity of the tested sample and a phase transformation rate of the tested sample.