Digital Microfluidic Array for Automated Dried Sample Extraction
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Solution Overview
Problem
The existing methods for processing dried blood spot samples for mass spectrometry analysis are time-consuming and labor-intensive, particularly due to the extensive sample preparation regimen, which limits throughput and increases costs in high-volume applications like newborn screening.
Innovation Solution
A digital microfluidic platform is used for sample preparation, where a dried sample is contacted with an extraction solvent to extract analytes, and the extracted sample is then processed for derivatization, enabling direct interfacing with mass analysis devices through nano-electrospray, thereby reducing manual handling and increasing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional off-line sample preparation methods are used for dried blood spot analysis, then sample extraction can be achieved, but the process requires extensive manual handling including centrifugation, multiple transfer steps, and labor-intensive procedures that reduce throughput
Solution Approach 1:
The patent combines multiple separate sample preparation steps (extraction, centrifugation, transfer, derivatization) into a single integrated microfluidic device. The microfluidic chip integrates the extraction chamber, separation channel, and derivatization zone into one continuous flow path, eliminating the need for manual transfer between multiple instruments and significantly reducing preparation complexity while maintaining extraction efficiency
Solution Approach 2:
The patent introduces a microfluidic chip as an intermediary device between the dried blood spot sample and the mass spectrometer. This chip serves as a self-contained processing unit that performs all necessary sample preparation functions internally, replacing the need for complex external equipment and manual operations while enabling direct coupling to the mass spectrometer for high-throughput analysis
2Measurement precision
If extensive sample preparation steps including centrifugation and multiple transfers are performed, then analyte extraction is achieved, but the analysis time increases significantly reducing turn-around-time
Solution Approach 1:
The patent implements continuous flow processing through the microfluidic device, where the analyte extraction, separation, and derivatization occur in an uninterrupted sequence. The liquid phase continuously moves through the integrated channels, eliminating idle transfer times between discrete steps and maintaining constant processing action throughout the sample preparation workflow
Solution Approach 2:
The patent segments the sample preparation process into distinct functional zones within the microfluidic chip (extraction zone, separation channel, derivatization zone), allowing each function to occur simultaneously in parallel rather than sequentially. This spatial segmentation enables multiple processes to occur at the same time, dramatically reducing total preparation time while maintaining extraction efficiency
3Productivity
If manual sample handling and robotic sample preparation are used, then samples can be processed, but operator intervention and maintenance requirements increase costs
Solution Approach 1:
The microfluidic device is designed to perform sample preparation autonomously without requiring operator intervention or complex robotic systems. The device self-regulates the flow, mixing, and processing steps through integrated microfluidic channels and passive flow control mechanisms, eliminating the need for expensive robotic sample handlers and reducing operational costs for high-volume processing
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 significantly reduces sample preparation time, increases throughput, and decreases costs by automating the process, allowing for faster and more efficient analysis of multiple samples with minimal operator intervention.
Implementation Method 1
contacted with digital microfluidic array. An analyte present within the dried sample is extracted into an extraction solvent by electrically addressing the digital microfluidic array to transport a droplet of extraction solvent to the dried sample spot
Implementation Method 2
contacting a droplet containing extracted analyte with the microfluidic channel and applying a suitable electric field for generating nano-electrospray, thereby enabling the device to be directly interfaced with a mass analysis device
Data Source
AI summary
Methods are provided for the preparation of a sample using a digital microfluidic platform and the optional subsequent mass analysis of an extracted analyte. A sample is dried, optionally on a solid phase support, and contacted with digital microfluidic array. An analyte present within the dried sample is extracted into an extraction solvent by electrically addressing the digital microfluidic array to transport a droplet of extraction solvent to the dried sample spot. The extracted sample may be dried and subsequently processed on the digital microfluidic array for derivatization. The digital microfluidic device may further include an integrated microfluidic channel having an output aperture, and the method may further include contacting a droplet containing extracted analyte with the microfluidic channel and applying a suitable electric field for generating nano-electrospray, thereby enabling the device to be directly interfaced with a mass analysis device.