Dry Reagent Colorimetric Nanoparticle Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for detecting engineered nanoparticles in aqueous media are often costly, time-consuming, or both, making it difficult to rapidly and economically assess their exposure and risks in environmental samples.
Innovation Solution
A dry reagent colorimetric sensing composition comprising sodium borohydride, methylene blue, and 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid, which forms a powdered mixture that, when combined with an aqueous solution, allows for rapid detection of metallic nanoparticles based on light absorbance, providing a cost-effective and efficient alternative to advanced instrumentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If advanced instrumentation techniques (ICP-MS, TEM) are used for nanoparticle detection, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent employs a disposable dry reagent strip containing methylene blue and sodium borohydride that is discarded after single use. This eliminates the need for expensive, complex instrumentation like ICP-MS while achieving sufficient detection precision for environmental monitoring applications. The low-cost reagent strip is optimized for single-use portability and simplicity.
Solution Approach 2:
The patent replaces complex mechanical and electronic instrumentation systems (ICP-MS, TEM) with a simple colorimetric chemical reaction system. The detection mechanism shifts from sophisticated instrumental analysis to a straightforward optical measurement of color change, dramatically reducing device complexity while maintaining adequate measurement precision for the application.
2Measurement precision
If advanced instrumentation techniques are used for nanoparticle detection, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The dry reagent strip is pre-prepared with methylene blue and sodium borohydride in optimal concentrations and ratios before deployment. This preliminary preparation eliminates time-consuming setup procedures during actual detection, allowing immediate insertion into the sample and rapid colorimetric response within minutes, thus reducing overall detection time while maintaining precision.
3Measurement precision
If extraction techniques are used to concentrate low-concentration nanoparticles, then measurement precision is improved, but loss of time and device complexity increase
Solution Approach 1:
The patent optimizes the concentrations of methylene blue and sodium borohydride in the dry reagent strip, along with the pH buffer composition, to enhance the sensitivity of the colorimetric reaction. This parameter optimization allows direct detection of low-concentration nanoparticles without requiring time-consuming pre-concentration or extraction steps, achieving both precision and speed.
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
Enables the rapid detection of metallic nanoparticles in aqueous media, with concentrations as low as 5 μg/L detectable within minutes, offering a reliable and economic solution for monitoring nanoparticle presence in water systems, suitable for industrial and environmental applications.
Implementation Method 1
The metallic nanoparticles catalyze the reduction of MB to leuco methylene blue (LMB)
Implementation Method 2
The metallic nanoparticles catalyze the reduction of MB to leuco methylene blue (LMB)
Implementation Method 3
assessing a concentration of the metallic nanoparticles in the test solution based on absorbance of light by the test solution
Data Source
AI summary
A composition for dry reagent colorimetric sensing of nanoparticles in aqueous media, including sodium borohydride (NaBH4), methylene blue (MB), and 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES) in the form of a powdered mixture. The composition may be formed by combining MB, HEBES, and water to yield an aqueous mixture, removing water from the aqueous mixture to yield a solid mixture, and combining NaBH4 powder with the solid mixture to yield the composition. The composition may be used to detect metallic nanoparticles an aqueous solution by combining the composition with an aqueous solution to yield a test solution, and assessing a concentration of the metallic nanoparticles in the test solution based on absorbance of light by the test solution. The composition may be provided in an assay kit for sensing nanoparticles in aqueous media.