Microfluidic Device Layered Meshes Aflatoxin Concentration
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Solution Overview
Problem
Current liquid chromatography techniques are limited in their ability to identify the source of aflatoxin contamination in milk at dairy farms, as testing is typically done at processing facilities where milk is blended, making it difficult to trace the source of contamination.
Innovation Solution
A microfluidic device with a layered configuration of meshes, each with different functionalizing materials and aperture sizes, is used to capture and concentrate aflatoxin from milk samples, allowing for on-site testing and identification of the contaminant source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional liquid chromatography is used at dairy processing facilities, then aflatoxin detection is possible, but the source of contamination cannot be identified due to milk blending
Solution Approach 1:
The device segments the chromatography process into distinct functional zones within a single microfluidic chip: sample introduction, chromatographic separation via affinity media, and detection. This integration allows farm-level testing to identify contamination sources without the complexity of traditional laboratory chromatography systems
Solution Approach 2:
The patent transitions from macro-scale liquid chromatography to micro-scale microfluidics, reducing the device dimensions to micrometer scale. This dimensional change enables portable, field-deployable testing at dairy farms while maintaining separation and detection capabilities
2Device complexity
If microfluidic devices with meshes are used, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The device employs porous affinity media in the form of meshes with controlled pore structures. These porous materials provide both the chromatographic separation function and the structural framework, reducing overall device complexity while the pore dimensions are optimized to balance manufacturing feasibility with functional performance
Solution Approach 2:
The patent optimizes mesh parameters including aperture size (10-100 micrometers), wire diameter (1-10 micrometers), and mesh density to achieve effective aflatoxin capture. These parameter adjustments balance manufacturing precision requirements with device functionality, allowing standard fabrication techniques to produce effective devices
3Adaptability or versatility
If conventional chromatography systems are used, then separation capability is achieved, but portability and field deployment capability are lost
Solution Approach 1:
The patent scales down the entire chromatography system to microfluidic dimensions, reducing device volume from laboratory-scale to portable handheld size. This dimensional reduction enables field deployment at dairy farms while preserving the essential separation and detection functions through optimized micro-scale fluid dynamics
Solution Approach 2:
The device merges multiple functions into a single integrated microfluidic chip: sample loading, chromatographic separation using affinity media, analyte concentration, and detection. This functional integration eliminates the need for separate laboratory equipment, enabling portable field deployment
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 device effectively concentrates aflatoxin, enabling detection and tracing of contamination sources, with a compact and cost-effective system suitable for field use, such as dairy farms, achieving a concentration factor of up to 20.4 times in under 20 minutes.
Implementation Method 1
an affinity media is selected to have affinity with the analyte of interest
Implementation Method 2
a microfluidic device including meshes and used in a bioassay
Data Source
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AI summary
A microfluidic device has a cavity in which a functionalised mesh is arranged in a layered configuration to provide a high surface area. The cavity is housed in a body that is easily configured for sample flow to concentrate the analyte, heat release of the analyte from the mesh, and elution of the released analyte. The microfluidic device can be used in a variety of applications by functionalising the mesh with a suitable affinity media.