Microporous Enzyme Structure for Rapid Pathogen Lysis
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Solution Overview
Problem
Current methods for pathogen cell lysis are slow and inefficient, requiring prolonged enzyme incubations and the use of detergents or chaotropic salts, which can inhibit downstream PCR and complicate sample processing, especially in microfluidic devices where residence time is limited.
Innovation Solution
A microfluidic device with a microporous structure, such as a polymer or silica monolith or packed beads with immobilized enzymes like lysozyme and proteinase K, that enables rapid continuous flow lysis of pathogen cells by providing sufficient residence time and minimizing interference with downstream processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chemical cell lysis is used with lysis buffer and enzyme incubation, then complete cellular lysis can be achieved, but the process requires prolonged incubation time and agitation
Solution Approach 1:
The patent applies preliminary action by pre-coating the microporous structure with lyophilized enzymes before sample introduction. This pre-preparation of the lysis surface eliminates the need for prolonged incubation during sample processing, as the enzymes are already positioned and activated on the porous structure to immediately act on cells as they pass through
Solution Approach 2:
The patent implements continuous flow lysis where cells continuously pass through the microporous structure coated with enzymes. This continuous action replaces the batch processing with intermittent agitation, maintaining constant enzymatic contact with cells to achieve complete lysis in minutes rather than hours
2Productivity
If mechanical lysis using rigid microstructures is used for continuous flow, then processing speed is improved, but it is extremely challenging for pathogen cells due to their small size
Solution Approach 1:
The patent uses a microporous structure as the substrate for enzyme coating, where the porous architecture provides high surface area for enzyme attachment while maintaining appropriate pore sizes to accommodate and effectively lyse small pathogen cells. The porous material enables both continuous flow throughput and effective mechanical-enzymatic action on small cells
Solution Approach 2:
The patent creates a composite system by coating lyophilized enzymes onto the microporous structure surface. This composite of porous material and enzymatic layer combines the mechanical flow-through capability with targeted biochemical lysis action, effectively addressing both the speed and reliability requirements for pathogen cell lysis
3Device complexity
If enzymes are simply mixed with sample while flowing through a microfluidic channel, then device simplicity is maintained, but there is not enough residence time in the channel for cell lysis to be effective
Solution Approach 1:
The patent applies the skipping principle by using lyophilized enzymes that are rapidly rehydrated and activated as cells pass through the microporous structure. This approach rushes through the traditional long incubation period by utilizing the high surface area and concentrated enzyme loading on the porous structure to achieve effective lysis in the brief residence time of continuous flow
4Loss of time
If detergents or chaotropic salts are used for rapid lysis, then processing time is reduced, but they can inhibit downstream PCR and necessitate additional separation steps
Solution Approach 1:
The patent extracts and eliminates the harmful lysis buffer components (detergents and chaotropic salts) from the process by using only lyophilized enzymes on the microporous structure. This extraction of the problematic substances while retaining the effective lysis mechanism eliminates PCR inhibition and the need for additional buffer removal steps
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
Enables rapid and efficient lysis of pathogen cells, reducing processing time from hours or days to minutes, while avoiding the use of detergents and chaotropic salts, thus improving the efficiency of DNA extraction and reducing healthcare costs associated with delayed diagnoses.
Implementation Method 1
an enzyme immobilized on a surface of the microporous structure which is configured to lyse pathogen cells
Data Source
AI summary
The present invention relates to methods and systems for cell lysis in a microfluidic device. More specifically, embodiments of the present invention relate to methods and systems for rapid continuous flow pathogen cell lysis. In one embodiment, the microfluidic device comprises a microfluidic channel, a microporous structure within the channel, and an enzyme immobilized on the surface of the microporous structure configured to lyse pathogen cells in fluid flowing through the microfluidic channel.