Oil-Phase Microfluidic Sensor for Droplet Analyte Detection
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Solution Overview
Problem
Current droplet microfluidic technologies lack effective methods for sensing analytes, particularly in aqueous phases, due to the limited availability of suitable molecular probes and interference from aqueous samples, which restricts the detection of electrolytes and other analytes in clinical and diagnostic applications.
Innovation Solution
The use of an oil phase with embedded signaling, recognition, and optionally exchanger molecules that form droplets from aqueous samples, allowing for selective chemical sensing without requiring aqueous solubility of sensing molecules and minimizing optical interference, enabling the detection of ions and uncharged analytes in microfluidic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescence-based detection methods are used in droplet microfluidics, then measurement speed and sensitivity are improved, but the detection is restricted to specifically designed enzyme assays and metabolite detection using fluorogenic substrates
Solution Approach 1:
The patent changes the fundamental parameter of the sensing phase from aqueous to oil-based. By using an oil phase containing sensing molecules instead of aqueous fluorogenic substrates, the system expands detection capabilities to include ions, uncharged analytes, and polar analytes that cannot be detected by traditional fluorescence methods in water-immiscible environments
Solution Approach 2:
The oil phase acts as an intermediary medium between the aqueous droplet containing the analyte and the detection system. The sensing molecules embedded in the oil phase interface with the aqueous droplet to detect analytes, enabling detection of various analyte types including ions and uncharged molecules that are inaccessible to traditional aqueous-based fluorescent probes
2Difficulty of detecting and measuring
If molecular probes are used for sensing analytes in aqueous phases, then detection capability is improved, but the availability of suitable probes is limited and optical interference from aqueous samples occurs
Solution Approach 1:
Instead of placing sensing molecules in the aqueous phase as in traditional approaches, the patent inverts the arrangement by embedding sensing molecules in an oil phase that forms droplets from aqueous samples. This inversion eliminates optical interference from aqueous samples and expands probe availability to include sensing molecules that are insoluble in water but soluble in oil
Solution Approach 2:
The patent extracts the sensing function from the aqueous phase and relocates it to an oil-based phase. By removing the requirement for aqueous solubility of sensing molecules, the system eliminates optical interference from turbid or colored aqueous samples while maintaining effective analyte detection through the oil-aqueous interface
3Productivity
If droplet microfluidics is used for high-throughput analysis, then productivity is improved, but effective sensing methods for electrolytes and analytes are lacking
Solution Approach 1:
The oil phase sensing system provides universal detection capability for multiple analyte types including ions, uncharged analytes, and polar analytes within the same droplet microfluidic platform. This multi-functionality maintains high throughput while expanding detection capabilities beyond what is possible with analyte-specific fluorescent substrates
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 approach enables in-situ sensing of electrolytes and other analytes with high selectivity and sensitivity, facilitating advanced diagnostics and analytical capabilities in microfluidic systems, including the detection of ions and uncharged analytes in small volumes, such as those found in biological samples.
Implementation Method 1
an oil phase that both segments samples (e.g., biological samples, environmental samples) into droplets and provides oil segments (e.g., in the sub-nanoliter or nanoliter range) that are highly selective chemical sensors for adjacent aqueous droplets
Data Source
AI summary
Provided herein is technology relating to microfluidics and particularly, but not exclusively, to devices, methods, and systems for detecting and/or quantifying analytes in samples using a microfluidic sensor device comprising an oil phase that segments aqueous samples into droplets and provides oil segments that are highly selective chemical sensors for adjacent aqueous droplets.