SERS Tracer Detection in Liquid Compositions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for detecting tracer compounds in liquid products using surface-enhanced spectroscopy face challenges due to properties like viscosity, optical transparency, and composition that inhibit interaction with metal colloids or substrates, leading to interference with SERS spectra collection.
Innovation Solution
A method involving the use of soluble tracer compounds like xanthene dyes and non-coloured compounds, which provide high signal intensity and stability, along with the optional separation of solids and dilution of samples, to enhance SERS signals, and the selection of appropriate SES substrates and aggregating agents to promote reproducible and accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If surface-enhanced spectroscopy is used to detect tracer compounds at very low concentrations, then detection sensitivity is improved, but liquid product properties (viscosity, optical transparency, composition) interfere with the detection process
Solution Approach 1:
The patent extracts the interfering components (solids, particulates) from the liquid composition through filtration or centrifugation before SERS analysis. This removal of harmful factors allows the tracer compound to interact effectively with the metal colloid surface without interference from the liquid matrix properties.
Solution Approach 2:
The patent introduces an intermediary step of sample preparation (filtration, centrifugation, or dilution) between the liquid composition and the SERS analysis. This intermediary process modifies the sample to eliminate interfering factors while preserving the tracer compound, enabling successful detection despite the originally problematic liquid properties.
2Stability of the object's composition
If tracer compounds are added at very low concentrations for identification purposes, then product integrity is maintained, but detection becomes more difficult
Solution Approach 1:
The patent changes the physical parameters of the sample (through filtration, centrifugation, or dilution) to enhance detection sensitivity. By modifying parameters such as particle removal or concentration adjustment, the method enables detection of tracer compounds at very low concentrations that would otherwise be undetectable, while maintaining the integrity of the original composition.
Solution Approach 2:
The patent performs preliminary sample preparation actions (filtration, centrifugation, dilution) before the actual SERS detection. These preliminary steps prepare the sample by removing interfering factors and optimizing conditions, thereby enabling subsequent detection of trace-level tracer compounds without compromising product integrity.
3Reliability
If sample preparation steps like filtration and centrifugation are performed, then interference from solids is removed, but analysis time increases
Solution Approach 1:
The patent applies partial action by selecting only the necessary sample preparation steps required for each specific liquid composition. Rather than always performing all possible preparation steps (filtration, centrifugation, dilution), the method selectively applies only those steps needed to remove interfering factors for the given sample, thereby reducing analysis time while maintaining signal stability.
Solution Approach 2:
The patent performs preliminary assessment of the liquid composition to determine which sample preparation steps are necessary. By evaluating the specific properties of each sample beforehand, the method applies only the required preparation actions, avoiding unnecessary time consumption while ensuring reliable SERS signals through appropriate interference removal.
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 detection of tracer compounds at very low concentrations, providing a stable and distinguishable signal over time, even in complex compositions, facilitating the identification of liquid products and preventing counterfeiting.
Implementation Method 1
Surface enhanced spectroscopy (SES) is one such method of determining an analyte at very low concentrations. The use of SES for the detection of tracer compounds in liquid products is described, for example, in WO2008/019161 which concerns a method of fuel identification with surface enhanced Raman spectroscopy (SERS) tags.
Implementation Method 2
acquiring the Raman spectrum of the Raman active reporter compound associated with the tracer
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A method of detecting a tracer compound dissolved in a liquid composition by means of surface- enhanced spectroscopy comprises the steps of: a.optionally, diluting said liquid composition or said separated liquid by mixing with a diluent liquid; b.bringing a sample of the separated liquid into contact with, a spectroscopy- enhancing surface comprising gold, silver or copper; c.obtaining a Raman spectrum from the sample; and d.calculating, from said spectrum, the concentration of the tracer in the sample relative to the concentration of a second component of the composition.