Magnetic Bead-Aptamer Complex for Multi-Target Molecular Detection
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Solution Overview
Problem
Current methods for detecting protein and nucleic acid interactions, such as ELISA and SELEX-based techniques, face limitations in sensitivity, accuracy, and complexity, particularly in detecting low concentrations of analytes and requiring labor-intensive manual processes.
Innovation Solution
A method using magnetic bead-aptamer complexes for simultaneous detection of multiple target molecules, involving incubation, acid elution, and mass spectrometry analysis, which allows for qualitative and quantitative detection and analysis of target molecules in samples like serum and body fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ELISA methods are used for protein detection, then the detection can be performed with established protocols, but the detection limit is limited to about 1 pg/mL due to the Kd value of antibody-antigen interaction
Solution Approach 1:
The patent replaces the conventional ELISA detection system (based on antibody-antigen binding mechanics) with a magnetic bead-aptamer complex system. The aptamer, a nucleic acid molecule, binds to the target protein with much higher affinity than antibodies, enabling detection at femtomolar concentrations (10^-15 M) rather than the picogram per milliliter limit of ELISA. This substitution of the binding mechanism fundamentally improves the detection limit.
2Measurement precision
If SELEX technique is used to screen aptamers, then specific ligands can be obtained for target molecules, but the detection process becomes complicated and requires separation of ligand from aptamer
Solution Approach 1:
The patent merges the aptamer detection system with magnetic bead technology. The aptamer is conjugated to magnetic beads, forming a magnetic bead-aptamer complex that can be easily manipulated and detected. This integration eliminates the need for separate ligand-aptamer separation steps required in conventional SELEX-based methods, as the magnetic beads provide both the capture function and the detection signal.
Solution Approach 2:
The patent employs fluorescently labeled aptamers that exhibit color changes or fluorescence signals upon binding to target molecules. This optical detection method provides a simple, direct readout that eliminates complex separation and analysis procedures, allowing specific detection to be achieved through straightforward fluorescence measurement rather than labor-intensive manual processes.
3Productivity
If manual processes are used for aptamer detection, then the detection can be performed with simple equipment, but labor-intensive manual processes reduce productivity and increase time consumption
Solution Approach 1:
The magnetic bead-aptamer complex system is designed to be self-contained and self-operating to a large extent. The magnetic beads automatically concentrate the target molecules through magnetic attraction, and the fluorescently labeled aptamers automatically bind and signal the presence of targets. This eliminates the need for continuous manual intervention in sample preparation, concentration, and detection steps, thereby dramatically increasing productivity while maintaining ease of operation through simple magnetic separation and fluorescence reading.
Data Source
AI summary
This application relates to molecular biology, and more specifically to a method which uses the molecular recognition between a target molecule ligand and an aptamer, magnetic separation and MS qualitative and quantitative analysis to enable the association between the detection of multi molecules and information of multiple functional groups, and effectively determine the correlation between molecules and functional groups of the body or tissue. This application can easily purify the target molecules by magnetic separation and can effectively obtain the target molecule group based on the high specificity and affinity of the aptamer. In addition, based on the MS detection, this application can effectively perform the qualification and quantification of the multi molecules, achieving the secondary molecular detection and improving the detection accuracy. The simultaneous qualification and quantification of multi molecules can not only accurately reflect the relationship among molecules, but also reveal the interrelationship among body functions, playing a significant role in the proteomics and genomics research and clinical molecular detection.