Nanoflower Immunochromatographic Strip for Mercury Ion Detection
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Solution Overview
Problem
Traditional methods for detecting heavy metal mercury ions, such as Atomic Absorption Spectrometry and Inductively Coupled Plasma Mass Spectrometry, are expensive, time-consuming, and not suitable for on-site rapid detection, posing challenges for environmental and health safety monitoring.
Innovation Solution
A nanoflower immunochromatographic strip using gold-nanoflower particles labeled with anti-mercury-ion monoclonal antibodies, combined with an immunoprobe and nitrocellulose membrane, for specific and sensitive detection of mercury ions in cereals, with a simple assembly and high stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional detection methods such as Atomic Absorption Spectrometry and Inductively Coupled Plasma Mass Spectrometry are used, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses disposable immunochromatographic test strips with gold nanoflower labels instead of expensive, complex instrumentation. Each strip is a single-use, low-cost device that provides sufficient detection precision for field applications, eliminating the need for maintenance and operation of complex spectrometry equipment.
Solution Approach 2:
The patent replaces complex mechanical and optical systems (spectrometers, mass spectrometers) with a simpler immunological recognition system. The detection mechanism shifts from physical measurement instruments to biological recognition elements (antibodies) combined with visual or simple optical readout of gold nanoparticle aggregation.
2Measurement precision
If traditional detection methods are used, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent uses pre-prepared immunochromatographic strips with antibodies already immobilized on the membrane and gold nanoflower labels pre-conjugated to secondary antibodies. This preliminary preparation allows direct application of samples without time-consuming instrument setup, calibration, or sample preparation procedures required by traditional methods.
Solution Approach 2:
The disposable nature of the test strips enables rapid detection without the time-consuming procedures of instrument warm-up, calibration, and maintenance that characterize traditional analytical methods. Each strip is ready-to-use and provides results quickly, sacrificing some precision for speed in field applications.
3Measurement precision
If traditional detection methods are used, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The patent replaces energy-intensive analytical instruments (atomic absorption spectrometers requiring hollow cathode lamps and high-power light sources, mass spectrometers requiring high-voltage ionization) with a low-energy immunological assay. The detection relies on antigen-antibody binding and visual or simple optical detection of gold nanoparticle color changes, consuming minimal energy.
Solution Approach 2:
The disposable test strips eliminate the need for continuous operation and maintenance of high-energy analytical instruments. Each strip requires no external power source or energy input beyond simple visual inspection or basic optical reading, dramatically reducing overall energy consumption compared to traditional methods.
4Measurement precision
If traditional detection methods are used, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent replaces complex operational procedures of traditional instruments (sample injection, method selection, parameter optimization, data processing) with a simple dip-and-wait operation. The immunochromatographic strip requires only insertion into the sample, automatic capillary flow, and visual reading, making it accessible to non-experts while maintaining adequate precision for field use.
Solution Approach 2:
The disposable strips are designed for single-use simplicity, eliminating the need for trained operators to manage complex instrumentation. Each strip is self-contained with all reagents pre-loaded, requiring no technical expertise beyond basic handling, thus dramatically improving ease of operation compared to traditional analytical methods.
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 nanoflower immunochromatographic strip enables rapid detection of mercury ions with a detection threshold of 50 ng/mL and a minimum detection limit of 1.56 ng/mL under visible conditions, and 0.39 ng/mL with a card reader, providing effective on-site monitoring of heavy metal residues in grains.
Implementation Method 1
the immunoprobe joint pad is dropwise added with gold nano-immunoprobe labeled with anti-mercury-ion monoclonal antibody
Implementation Method 2
a nitrocellulose (NC) membrane
Data Source
AI summary
A nanoflower immunochromatographic strip for detecting heavy metal mercury ions is provided. The nanoflower immunochromatographic strip includes the following components: a plastic outer shell, a sample pad, an immunoprobe joint pad, a nitrocellulose membrane and an absorbent pad; the immunoprobe joint pad is dropwise added with a gold nano-immunoprobe labeled with an anti-mercury-ion monoclonal antibody; the anti-mercury-ion monoclonal antibody is a monoclonal antibody secreted by an anti-Hg2+-ITCBE hapten murine hybridoma cell strain 7A1; and a preservation number of the murine hybridoma cell strain 7A1 is CGMCC No. 23879. The nanoflower immunochromatographic strip detects a heavy metal hapten Hg2+-ITCBE, with a detection threshold of 50 ng/mL and a detection limit of 0.39 ng/mL, has strong specificity, high sensitivity, good repeatability and rapid detection, and is of great significance for monitoring residue of heavy metal mercury.