Silica-Enhanced Lanthanide TRF for Polyelectrolyte Detection
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Solution Overview
Problem
Current methods for determining the concentration of polyelectrolytes or phosphonates in samples, particularly at low concentrations, face limitations due to insufficient time-resolved fluorescence (TRF) signal amplification, which is inadequate for practical applications in industries like water treatment and oil recovery.
Innovation Solution
The introduction of small amounts of soluble silica, such as silicic acid or sodium silicate, enhances the TRF signal of lanthanide(III)-polyelectrolyte or -phosphonate chelates, allowing for the detection of lower concentrations by optimizing the chelate configuration and reducing radiationless decay processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If simple admixing of polymer with lanthanide(III) is used, then the measurement method is simple and easy to operate, but the TRF signal amplification is insufficient for quantification of low concentrations
Solution Approach 1:
Silica acts as an intermediary substance that facilitates enhanced interaction between the lanthanide(III) ion and the polymer. The silica forms a complex with the lanthanide(III) ion that has higher stability and fluorescence quantum yield, thereby amplifying the TRF signal without complicating the measurement procedure. This mediator approach allows simple admixing to achieve detection of low concentrations.
Solution Approach 2:
The invention utilizes a composite system consisting of silica-lanthanide(III) ion-polymer complex. The silica-lanthanide(III) composite exhibits enhanced time-resolved fluorescence properties compared to simple lanthanide(III) salts, enabling detection of polyelectrolytes and phosphonates at concentrations as low as 0.01-500 ppm while maintaining operational simplicity.
2Measurement precision
If higher polymer concentration is used to achieve sufficient TRF signal, then the TRF signal amplification is adequate for quantification, but the method cannot detect low concentrations required in water treatment applications
Solution Approach 1:
The invention changes the chemical composition parameter by introducing silica into the measurement system. This parameter change transforms the lanthanide(III) coordination environment, increasing the fluorescence quantum yield and enabling detection at much lower polymer concentrations (0.01-500 ppm) while maintaining adequate TRF signal amplification for quantification.
3Measurement precision
If silica additive is added to enhance TRF signal, then the detection limit is improved for low concentrations, but the device complexity increases due to additional reagents
Solution Approach 1:
Silica serves as a simple intermediary reagent that can be added directly to the sample-containing solution with lanthanide(III) ion. The addition of this single substance enhances the TRF signal without requiring complex instrumentation or multiple reagent additions, thus improving detection limit while minimizing device complexity.
Solution Approach 2:
The silica additive is a simple, inexpensive reagent that can be used in disposable test tubes or cuvettes. The measurement process requires only the addition of silica and lanthanide(III) ion to the sample, followed by TRF measurement, avoiding the need for expensive or complex equipment modifications.
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
This approach significantly amplifies the TRF signal, enabling the detection of polyelectrolytes and phosphonates at concentrations as low as 0.01-500 ppm, making it suitable for practical use in various industrial applications.
Implementation Method 1
time-resolved fluorescence (TRF) measurement
Implementation Method 2
time-gated luminescence
Implementation Method 3
amplify the TRF signal of lanthanide(III)-polyelectrolyte or -phosphonate chelates
Implementation Method 4
water molecules quench the TRF signal by radiationless decay process
Implementation Method 5
water molecules quench the TRF signal by radiationless decay process
Data Source
Figure 1~2
AI summary
The present invention provides a method for determining concentration of polyelectrolyte or phosphonate in a sample comprising polyelectrolyte or phosphonate in low concentrations. The method comprises admixing the sample with a reagent comprising a lanthanide (lll) ion; admixing the sample with silica; allowing the polyelectrolyte or phosphonate in the sample to interact with the reagent comprising the lanthanide(lll) ion and the silica; exciting the sample and detecting a sample signal deriving from the lanthanide (lll) ion by time resolved fluorescence measurement; and determining the concentration of the polyelectrolyte or phosphonate in the sample by using the detected sample signal.