Semi-Permeable Hydrogel Capsules for Multi-Step Sample Processing
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Solution Overview
Problem
Existing methods for encapsulating biological samples in semi-permeable capsules fail to support multi-step reactions and analyses, such as genotypic and phenotypic analysis of individual cells, due to limitations in fluidic operations and the inability to perform buffer/reagent exchange.
Innovation Solution
The production of semi-permeable capsules with a Dextran-rich core and PEGDA-based hydrogel shell, formed through microfluidics and photo-illumination, allows for multi-step processing and analysis of encapsulated species like cells, viruses, and nucleic acids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If droplet or emulsion-based formats are used for high-throughput processing, then throughput is increased, but the ability to perform sequential multi-step reactions is limited
Solution Approach 1:
The system segments the reaction process into distinct steps, with each step performed in separate wells of a microtiter plate. Encapsulated cells are transferred from one well to another for each reaction step, allowing sequential processing while maintaining high-throughput capability through parallelization across multiple plates and wells.
Solution Approach 2:
The invention introduces encapsulated cells as an intermediary carrier that can be transferred between different reaction environments. The encapsulation shell protects the cells during transfer and allows controlled interaction with reagents in each step, enabling multi-step processing without requiring complex fluidic operations.
2Quantity of substance
If cell lysis is performed for genetic material amplification, then DNA extraction is enabled, but subsequent enzymatic steps are inhibited
Solution Approach 1:
The invention extracts only the necessary genetic material information through amplification reactions performed on encapsulated cells, avoiding complete cell lysis. This allows DNA extraction and amplification while maintaining cell integrity and viability for subsequent enzymatic steps, separating the DNA extraction function from complete cell destruction.
Solution Approach 2:
The system performs preliminary DNA amplification reactions on intact encapsulated cells before any lysis steps. This preliminary action enables genetic material analysis while cells remain viable, allowing subsequent enzymatic steps to proceed without inhibition from lysis reagents.
3Adaptability or versatility
If complex fluidic operations are used for multi-step processing, then reaction versatility is improved, but system complexity and required expertise increase
Solution Approach 1:
The encapsulated cells serve as self-contained reaction vessels that require minimal external manipulation. Each capsule maintains its own reaction environment and can be processed through standard microtiter plate operations without requiring complex fluidic control systems, reducing device complexity while maintaining reaction versatility.
Solution Approach 2:
The invention changes the physical state and properties of the reaction system by using solid/semi-solid encapsulated cells instead of liquid droplets. This parameter change allows standard microtiter plate handling and simplifies fluidic operations while maintaining the ability to perform diverse biochemical reactions.
4Adaptability or versatility
If standard microtiter plates are used for sequential processing, then multi-step reactions are enabled, but throughput is limited compared to droplet formats
Solution Approach 1:
The invention makes microtiter plates multi-functional by enabling them to handle both simple and complex sequential reactions with encapsulated cells. The system can perform single-step reactions, multi-step biochemical assays, and high-throughput screening all using the same platform, increasing productivity while maintaining versatility.
Solution Approach 2:
The system enables continuous processing of encapsulated cells through multiple reaction steps without intermediate handling or transfer complexities. Each well can undergo a sequence of reactions continuously, maximizing the useful action time and increasing throughput compared to traditional droplet-based methods that require repeated manipulation.
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 capsules enable high-throughput, massively parallel processing and analysis of biological samples, maintaining cell viability and facilitating reactions like DNA amplification and phenotypic screening, with stability under mechanical stress and temperature cycles.
Implementation Method 1
The production of semi-permeable capsules with a Dextran-rich core and PEGDA-based hydrogel shell, formed through microfluidics and photo-illumination
Implementation Method 2
systems for isolation of species such as cells, bacteria, viruses, nucleic acids, biochemical compounds, and/or other materials in semi-permeable capsules
Data Source
AI summary
This invention relates to methods and systems for isolation of species in semi-permeable capsules and processing of encapsulated species through series of steps and/or reactions. To produce capsules, first aqueous two-phase system (ATPS) droplets are generated using microfluidics system. Then the hydrogel shell layer is hardened by inducing polymerization. As exemplified in this invention to achieve concentric ATPS droplet formation density-matched PEGDA and Dextran polymer solutions can be used. Once a capsule is formed, its composition can be changed by adding new reagents or replacing out old ones (e.g. by resuspending capsules in desired aqueous solution). The hydrogel shell of semi-permeable capsules can be dissolved at selected step during multi-step procedures to release the encapsulated species. This invention exemplifies isolation of individual cells within capsules and using the encapsulated cells for genotypic and phenotypic analysis. This invention also exemplifies use of capsules in multi-step procedures to perform complex biological reactions.