Microfluidic SPE-nanoLC-MS Interface for Biomonitoring
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Solution Overview
Problem
Current methods for biomonitoring using solid-phase extraction (SPE) coupled with nanoflow liquid chromatography-mass spectrometry (LC-MS) face challenges with sample volume mismatch, leading to peak broadening and poor chromatographic separation, making them impractical for analyzing low concentrations of target analytes from small biological samples.
Innovation Solution
A microfluidic device with a monolithic interface between SPE and nanoLC-MS, featuring a first fluid channel for analyte extraction and a second fluid channel for subset separation, coupled with an emitter and detector for signal generation, enabling efficient detection of multiple analytes from small sample volumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional SPE-LC-MS systems are used with large SPE column volume for efficient extraction, then extraction efficiency is improved, but volume mismatch causes peak broadening and poor chromatographic separation
Solution Approach 1:
The system segments the SPE-LC-MS interface into multiple discrete components: a micro-SPE column (0.1-2 mm length) integrated with a microfluidic chip, followed by a nanoflow LC column (10-50 cm length). This segmentation allows each component to be optimized independently - the micro-SPE column for efficient extraction from small volumes and the nanoflow column for high-resolution separation, eliminating the volume mismatch problem that plagues conventional systems.
2Measurement precision
If large sample volumes are used for analyzing low concentrations of target analytes, then detection sensitivity is improved, but sample availability is limited in population studies
Solution Approach 1:
The system changes the flow rate parameter to nanoflow conditions (10-500 nL/min), which dramatically improves detection sensitivity for low concentration analytes. This parameter change allows the system to achieve high sensitivity with minimal sample volumes (10-500 µL), making the system practical for population studies where sample availability is limited.
3Adaptability or versatility
If conventional SPE-LC-MS systems are used, then analysis of multiple analytes is possible, but throughput is reduced due to processing time and sample volume requirements
Solution Approach 1:
The system implements continuous nanoflow liquid chromatography coupled with micro-SPE, eliminating the need for batch processing and manual sample preparation steps. The continuous flow operation allows multiple analytes to be separated and detected in a single run, significantly improving throughput while maintaining the ability to analyze multiple analytes simultaneously.
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 solution enhances sensitivity, specificity, and throughput for biomonitoring by allowing high-sensitivity, high-specificity, and multiplexed detection of analytes in small biological samples, overcoming the limitations of traditional SPE-LC-MS systems.
Implementation Method 1
a first separation medium that is adapted to extract the plurality of analytes from the biological sample
Implementation Method 2
a second separation medium that is adapted to separate the plurality of analytes extracted in the first separation medium into subsets of analytes along the second fluid channel
Data Source
AI summary
The present disclosure provides methods and systems for detecting a presence or absence of one or more analytes in small volumes of samples. The detected presence or absence of the one or more analytes can be used for a variety of applications including biomonitoring.