Orthogonal Capillary Electrophoresis for Sub-Nanomolar Detection
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Solution Overview
Problem
Conventional capillary electrophoresis instruments face limitations in sensitivity, particularly for samples at sub-nanomolar quantities, and have low throughput, struggling to efficiently analyze multiple samples with varying concentrations and complex matrices.
Innovation Solution
An improved electrophoresis apparatus featuring a transport capillary orthogonal to multiple separation capillaries, each equipped with an analyte concentrator for enhanced sensitivity and throughput, utilizing multiple elution and derivatization steps to enrich and separate analytes, and incorporating chromophoric reagents for increased detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional capillary electrophoresis instruments are used, then the analysis can be performed with simple setup, but the sensitivity is insufficient for sub-nanomolar samples
Solution Approach 1:
The system divides the analysis into multiple dimensions by using arrays of capillaries (e.g., 96-well plate configuration) instead of a single capillary. Each capillary can be independently optimized for specific analytes, and the segmented structure allows parallel processing of multiple samples, thereby enhancing detection sensitivity without requiring a single overly complex instrument
Solution Approach 2:
The patent implements nested concentrators within the capillary system, where first concentrators are positioned at capillary inlets and second concentrators are positioned within the capillaries themselves. This nested arrangement allows sequential concentration steps that significantly enhance sensitivity for sub-nanomolar samples while maintaining a relatively compact overall structure
2Productivity
If single capillary analysis is used, then the device structure is simple, but the throughput is low for multiple samples
Solution Approach 1:
The system uses a universal plate-based architecture where the same capillary array structure can analyze multiple different analytes simultaneously by varying the buffer conditions, voltage, and detector settings. The concentrators are designed with universal binding capabilities that can be programmed to capture different target molecules, allowing one instrument to perform multiple analytical functions
Solution Approach 2:
The patent transitions from single-capillary sequential analysis to multi-capillary parallel analysis by adding spatial dimensionality. The 96-well plate configuration allows 96 simultaneous analyses, and the nested concentrator system adds another dimension of concentration enhancement, creating a multi-dimensional approach that dramatically increases throughput
3Measurement precision
If conventional detectors are used, then the system is simple to operate, but the detection sensitivity for low-concentration analytes is insufficient
Solution Approach 1:
The system performs preliminary concentration of analytes using nested concentrators before the actual detection step. First concentrators pre-concentrate analytes from large sample volumes, and second concentrators within the capillaries perform final concentration right before detection. This preliminary action ensures that even trace analytes are concentrated to detectable levels, enhancing sensitivity without requiring complex detection instrumentation
Solution Approach 2:
The patent incorporates chromogenic substrates and fluorescently labeled antibodies that produce detectable color or fluorescence changes when they bind to target analytes. These signal amplification methods convert subtle biochemical interactions into strong optical signals that can be detected by standard detectors, thereby enhancing sensitivity while maintaining ease of operation
4Measurement precision
If samples with varying concentrations are analyzed sequentially, then the analysis accuracy can be maintained, but the analysis time increases significantly
Solution Approach 1:
The system uses periodic elution cycles where all capillaries are eluted simultaneously at predetermined time intervals rather than sequentially. This periodic action allows samples with varying concentrations to be processed in parallel batches, maintaining quantification accuracy through standardized elution conditions while dramatically reducing total analysis time compared to sequential processing
Solution Approach 2:
The nested concentrators perform preliminary separation and concentration of analytes before the main detection phase. By pre-concentrating analytes from complex matrices and removing interfering substances during the concentration phases, the system ensures that subsequent detection and quantification steps can be performed rapidly and accurately on pre-prepared samples
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 apparatus achieves higher sensitivity and throughput, enabling the analysis of multiple samples with a wide range of concentrations, including low-concentration samples, and facilitates the detection of analytes in complex matrices, improving the efficiency and accuracy of bioanalysis.
Implementation Method 1
analyte concentrators containing affinity probes to bind target compounds
Implementation Method 2
Electrophoresis is a known technique for separating and characterizing constituent and/or biological molecules
Implementation Method 3
separation relies on the different migration of charged particles in an electric field
Implementation Method 4
an additional analyte concentrator containing a chromophoric reagent may be placed in one or more of the separation capillaries to react with the analyte
Data Source
AI summary
An electrophoresis apparatus is generally disclosed for sequentially analyzing a single sample or multiple samples having one or more analytes in high or low concentrations. The apparatus comprises a relatively large-bore transport capillary which intersects with a plurality of small-bore separation capillaries and includes a valve system. Analyte concentrators, having antibody-specific (or related affinity) chemistries, are stationed at the respective intersections of the transport capillary and separation capillaries to bind one or more analytes of interest. The apparatus allows the performance of two or more dimensions for the optimal separation of analytes. The apparatus may also include a plurality of valves surrounding each of the analyte concentrators to localize each of the concentrators to improve the binding of one or more analytes of interest.