Microfluidic eDNA Capture with Optical Flow Cell Routing
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Solution Overview
Problem
Current methods for collecting environmental DNA (eDNA) samples are labor-intensive and require manual collection, transportation, and preservation, which hinders efficient analysis and real-time monitoring of biodiversity and environmental changes.
Innovation Solution
A microfluidic system with an environmental sample inlet, preservative reagent inlet, and filter membranes, integrated with optical flow cells for real-time optical measurements and a bypass channel to selectively capture and concentrate eDNA samples, enabling intelligent fluid routing and filtration based on optical and pressure data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual collection and transportation of eDNA samples is used, then sample preservation can be achieved, but the process becomes labor-intensive and time-consuming
Solution Approach 1:
The patent combines sample collection, preservation, and concentration functions into a single integrated microfluidic device. The collection chamber directly connects to preservation reagent reservoirs and filter membranes within the same device, eliminating the need for separate manual steps of collection, transportation, and preservation while maintaining sample integrity through in-device preservation chemistry.
Solution Approach 2:
The microfluidic device performs self-preservation by automatically mixing collected samples with preservation reagents within the device chambers. The system uses passive diffusion and capillary action to ensure thorough mixing of samples with preservation chemistry, eliminating the need for external manual intervention or specialized transportation conditions.
2Reliability
If manual collection using sterile equipment is used, then sample contamination is prevented, but the process requires site visits and manual handling
Solution Approach 1:
The device features self-contained sterile barriers where sample collection occurs through integrated membranes and chambers that maintain sterile conditions without requiring external sterile equipment. The preservation reagents are pre-loaded into sealed reservoirs within the device, and sample-to-reagent mixing occurs automatically through passive diffusion, eliminating all manual handling steps while maintaining contamination prevention.
Solution Approach 2:
The device uses intermediate sterile membranes and sealed chambers as mediators between the external environment and the sample processing interior. These intermediate barriers allow sample intake while maintaining sterile separation, and the preservation chemistry acts as an intermediary that stabilizes samples without requiring manual intervention.
3Reliability
If stable transportation of samples to the lab is required, then sample integrity is maintained, but the process cannot provide real-time monitoring
Solution Approach 1:
The device performs self-concentration of eDNA through integrated filter membranes that trap genetic material while allowing water to pass through. This concentration process occurs automatically within the device using passive diffusion and filtration principles, maintaining sample integrity without requiring transportation to a laboratory, and preparing samples ready for immediate analysis upon device retrieval.
Solution Approach 2:
The device extracts and concentrates eDNA from large volumes of environmental water through integrated filter membranes. The filtration process separates and concentrates genetic material onto the membrane surface, extracting the essential analytical component from the bulk water sample while maintaining integrity, and this extraction occurs in-situ without requiring sample transportation.
4Measurement precision
If automated DNA sequencing is used, then identification accuracy is improved, but sample collection remains labor-intensive
Solution Approach 1:
The patent merges the sample collection, preservation, and concentration functions into a single automated microfluidic device that can be deployed in the field. This integrated approach automates the entire pre-analytical workflow, allowing high-accuracy DNA sequencing to be performed on samples that have been automatically collected and prepared, thereby eliminating the labor-intensive collection step while maintaining identification accuracy.
Solution Approach 2:
The device replaces manual mechanical collection processes with automated microfluidic flow systems. Passive diffusion, capillary action, and integrated pumping mechanisms automate sample uptake and processing, substituting manual labor with automated fluid handling while preserving sample quality for accurate sequencing analysis.
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 system enables efficient, automated, and real-time collection and concentration of eDNA samples, reducing labor and improving the accuracy of biodiversity assessments and early detection of harmful algal blooms and other environmental changes.
Implementation Method 1
at least one optical flow cell that enables at least one of light microscopy, fluorescence spectroscopy, light attenuation measurements, and scattered light intensity measurements
Implementation Method 2
at least one optical flow cell that enables at least one of light microscopy, fluorescence spectroscopy, light attenuation measurements, and scattered light intensity measurements
Implementation Method 3
at least one optical flow cell that enables at least one of light microscopy, fluorescence spectroscopy, light attenuation measurements, and scattered light intensity measurements
Implementation Method 4
at least one optical flow cell that enables at least one of light microscopy, fluorescence spectroscopy, light attenuation measurements, and scattered light intensity measurements
Implementation Method 5
one or more filter membranes for particle concentration
Data Source
AI summary
A microfluidic lab-on-a-chip (LOC) device, microfluidic systems, and associated methodology are described that allow for intelligently collecting environmental DNA (eDNA) and their associated metadata. Optical spectroscopy is integrated with filtration membranes on the microfluidic device. The microfluidic LOC device and systems can be used for selectively capturing targeted species based on optical characteristics and for recording relevant metadata on eDNA acquired by the filtration membranes.