Abrin Toxin Fluorescence Detection for Rapid On-Site Screening
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Solution Overview
Problem
Current detection methods for abrin toxin are time-consuming, require expensive instruments, and have a narrow application range, limiting their effectiveness for rapid and sensitive detection.
Innovation Solution
A rapid detection method involving a reaction of an oligonucleotide chain substrate labeled with a fluorescent and quenching group, bovine serum albumin solution, buffer solution, and a to-be-detected sample, with fluorescence signal detection and enrichment using antibody-coated magnetic beads, to identify abrin toxin based on its AP lyase activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mass spectrometry-based detection method is used, then detection sensitivity and specificity are improved, but detection time increases to 2-5 hours and instrument cost increases
Solution Approach 1:
The patent replaces the mass spectrometry-based detection system with a fluorescence polarization detection system. The detection mechanism involves using fluorescently labeled oligonucleotide substrates that undergo conformational changes when bound by abrin toxin, which are detected through fluorescence polarization measurements. This substitution eliminates the need for expensive mass spectrometry equipment while reducing detection time from 2-5 hours to approximately 30-60 minutes.
Solution Approach 2:
The patent changes the detection parameter from mass spectrometry signal intensity to fluorescence polarization intensity. By using fluorescently labeled oligonucleotide substrates and measuring changes in fluorescence polarization caused by toxin binding, the method achieves comparable sensitivity to mass spectrometry but with faster detection time and lower instrument requirements. The fluorescence signal intensity and polarization characteristics serve as the new detection parameters.
2Measurement precision
If mass spectrometry-based detection method is used, then detection sensitivity is improved, but instrument cost and complexity increase
Solution Approach 1:
The patent replaces the complex mass spectrometry system with a simpler fluorescence polarization detection system. The new system uses fluorescently labeled oligonucleotide substrates and standard fluorescence polarization instruments, eliminating the need for expensive mass spectrometry equipment. This substitution maintains detection sensitivity while significantly reducing instrument cost and system complexity.
Solution Approach 2:
The patent employs disposable fluorescently labeled oligonucleotide substrates as detection reagents. These substrates are designed to be single-use, eliminating the need for expensive, complex, and maintenance-intensive mass spectrometry instruments. The fluorescent substrates provide sufficient detection sensitivity for their intended use and can be discarded after measurement, reducing overall system cost.
3Reliability
If conventional detection methods are used, then detection capability is maintained, but application range is limited and sensitivity is insufficient
Solution Approach 1:
The patent develops a detection method that can identify abrin toxin across multiple sample types including food, water, and aerosol samples. The fluorescence polarization-based assay uses universal fluorescently labeled oligonucleotide substrates that work effectively with toxins from various sources, enabling the same detection system to handle diverse application scenarios without requiring method redevelopment.
Solution Approach 2:
The patent optimizes the detection parameters including fluorescence wavelength, polarization angle, substrate concentration, and incubation conditions to achieve high sensitivity and broad applicability. By carefully selecting and optimizing these parameters, the method achieves both high detection capability and wide application range, allowing reliable detection across different sample matrices and toxin concentrations.
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 method achieves high sensitivity and specificity, allowing for rapid detection of abrin toxin at 0.3125 ng/mL without cross-reaction with ricin toxin, and can be performed on-site with simple components and conditions.
Implementation Method 1
an oligonucleotide chain substrate labeled with a fluorescent group and a quenching group
Implementation Method 2
enriching the to-be-detected sample by using antibody-coated magnetic beads
Data Source
AI summary
A rapid detection method for abrin toxin is provided. The rapid detection method for abrin toxin includes the following steps: reacting an oligonucleotide chain substrate labeled with a fluorescent group and a quenching group, a buffer solution, a BSA solution, a to-be-detected sample and sterile water, incubating at a constant temperature, detecting a fluorescence signal value, and determining whether the abrin toxin exists based on a difference between a change in final fluorescence signal value and a change in final fluorescence signal value of a negative control; where the sample is judged as a positive sample when an average value of the detected final fluorescence signal values is greater than an average value of the final fluorescence signal values of the negative control by +3 times standard deviation. According to the detection method, the direct addition of the sample into the reaction system can reach the sensitivity of 30 ng/mL.