Microfluidic ITP Chip for Rapid Bacterial Detection
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Solution Overview
Problem
Current biological assays, such as those for bacterial infections, are time-consuming and costly, often taking several days to produce results, and existing techniques like PCR require elaborate preparation and specialized equipment.
Innovation Solution
The use of isotachophoresis (ITP) to focus target and ligand molecules into the same zone, allowing for rapid and sensitive detection of markers for infections and disease through molecular beacons, enabling real-time detection of clinically relevant concentrations within an hour.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional bacterial culture methods are used for infection detection, then the detection can be performed with simple equipment, but the detection time is excessively long (several days)
Solution Approach 1:
The patent combines multiple functions (purification, concentration, hybridization, and detection) into a single integrated microfluidic chip platform. The ITP module purifies and concentrates target molecules while the molecular beacon module performs detection, eliminating the need for separate equipment for each step and achieving rapid detection within one hour.
Solution Approach 2:
The patent replaces traditional mechanical separation methods with isotachophoresis (ITP), an electrophoretic technique that uses electric fields to separate and concentrate molecules based on their mobility. This substitution enables automated, rapid purification and concentration without complex mechanical operations.
2Measurement precision
If PCR assay is used for sequence identification, then the detection sensitivity is improved, but the assay becomes time-consuming and costly
Solution Approach 1:
The patent performs preliminary purification and concentration of target molecules using ITP before the hybridization detection step. By pre-concentrating the target molecules in the microfluidic chip, the assay achieves high detection sensitivity without requiring time-consuming PCR amplification, reducing total assay time to under one hour.
Solution Approach 2:
The patent uses disposable molecular beacon probes that are sequence-specific and can be synthesized cheaply. These single-use probes eliminate the need for expensive, complex PCR reagents and equipment while providing sufficient detection sensitivity for clinical applications.
3Measurement precision
If ITP is used to focus target and ligand molecules, then the detection sensitivity is enhanced through concentration, but the device complexity increases
Solution Approach 1:
The ITP module in the microfluidic chip serves multiple functions: it purifies target molecules from complex samples, concentrates them to enhance detection sensitivity, and delivers them to the detection zone. This multi-functionality reduces the need for separate purification and concentration devices, offsetting the increased chip structure complexity with operational simplicity.
Solution Approach 2:
The patent changes the electrophoretic conditions (voltage, buffer composition, temperature) during the ITP process to optimize both purification and concentration simultaneously. By dynamically adjusting these parameters, the system achieves high detection sensitivity without requiring overly complex chip structures with multiple fixed zones.
4Measurement precision
If elaborate preparation procedures are used for PCR, then the detection accuracy is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent merges sample preparation, purification, concentration, and detection into a single automated microfluidic chip operation. The user simply introduces the sample to the chip, and the integrated ITP and molecular beacon modules automatically perform all necessary steps, eliminating complex manual preparation procedures while maintaining high detection accuracy.
Solution Approach 2:
The microfluidic chip performs self-service functions including automatic sample purification via ITP, concentration of target molecules, and delivery to the detection zone. The system requires minimal user intervention beyond sample introduction, greatly simplifying operation while ensuring consistent, accurate results through automated control of all critical parameters.
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
ITP-based assays significantly reduce detection time and cost by concentrating target and ligand molecules, enabling rapid and sensitive detection of bacterial infections and microRNA profiling, with results showing enhanced sensitivity and specificity, particularly in urinary tract infections and microRNA analysis.
Implementation Method 1
Isotachophoresis (ITP) can be employed to simultaneously focus the target and ligand of an assay into the same ITP focus zone
Implementation Method 2
The resulting bound complex can be detected (e.g., by fluorescence)
Data Source
AI summary
Isotachophoresis (ITP) can be employed to simultaneously focus the target and ligand of an assay into the same ITP focus zone. The target and ligand can bind to each other in the ITP focus zone, and then the resulting bound complex can be detected (e.g., by fluorescence). The sensitivity of this approach can be greatly increased by the enhanced concentration of both target and ligand that ITP provides in the focus zone. Since ITP can be performed quickly, the resulting assay is both rapid and sensitive. Markers of bacterial urinary tract infections have been experimentally detected at clinically relevant concentrations with this approach. MicroRNA sequences have also been profiled with this approach, which is clinically relevant because MicroRNA is expected to provide useful markers for disease. In one experiment, miR-122 in human kidney and liver was detected and quantified.