Microfluidic Chip Enrichment Column for Glycan Detection
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Solution Overview
Problem
Current methods face challenges in detecting trace glycans, particularly acidic and sulfated glycans, due to their low abundance and interference from high-abundance neutral glycans, which limits their detection sensitivity and accuracy in diagnosing autoimmune diseases like rheumatoid arthritis.
Innovation Solution
A microfluidic chip with a unique enrichment column configuration, featuring two porous graphitized carbon sections and a titanium dioxide section, enhances the detection sensitivity of acidic glycans by enriching and separating them from neutral glycans, allowing for precise chromatographic analysis and quantification using a dual-mobile phase approach.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional chromatographic methods are used to analyze glycans, then neutral glycans can be detected, but detection sensitivity of acidic glycans is insufficient due to interference from high-abundance neutral glycans
Solution Approach 1:
The enrichment column is divided into three distinct sections with different materials (PGC, TiO2, PGC) that perform different functions: the first PGC section captures acidic glycans, the TiO2 section allows neutral glycans to pass through while retaining acidic glycans, and the second PGC section further purifies the acidic glycans. This segmentation enables selective enrichment of acidic glycans from the complex glycan mixture.
Solution Approach 2:
The method extracts and isolates acidic glycans from the complex glycan mixture by exploiting their acidic properties. The enrichment column selectively retains acidic glycans while allowing neutral glycans to pass through, effectively separating the target analytes from interfering substances.
2Measurement precision
If a simple enrichment column is used, then the device complexity is low, but the detection sensitivity of trace acidic glycans is insufficient
Solution Approach 1:
The enrichment column employs a composite structure combining three different materials (porous graphitized carbon and titanium dioxide) in a single column. Each material contributes different properties: PGC provides hydrophobic interaction and acidic group retention, while TiO2 provides size exclusion and allows neutral glycans to pass through. This composite approach achieves high sensitivity without requiring multiple separate columns.
3Measurement precision
If comprehensive glycan analysis is performed without enrichment, then all glycan types can be analyzed, but the low-abundance acidic glycans are undetectable
Solution Approach 1:
The enrichment column performs preliminary concentration and purification of acidic glycans before they enter the analytical column. By pre-enriching the acidic glycans and removing neutral glycans, the method ensures that even trace amounts of acidic glycans are sufficiently concentrated for detection by the mass spectrometer.
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 improves the detection sensitivity of trace glycans by near 1000-fold, enabling comprehensive glycomic profiling and accurate classification of autoimmune diseases, particularly rheumatoid arthritis, and reveals novel sulfated glycan biomarkers for diagnostic applications.
Implementation Method 1
the titanium dioxide section enriches acidic glycans
Implementation Method 2
analytical PGC column performs chromatographic separation of glycans
Data Source
AI summary
The present invention discloses a method of determining the presence of autoimmune disease with the use of glycan biomarkers. A method of improving the detection sensitivity of trace glycans from a mixture of glycans and a microfluidic chip therefor are also disclosed.