Integrated IRE Sample Container for ATR-FTIR Signal Clarity
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Solution Overview
Problem
Current FTIR spectroscopy methods face challenges in effectively analyzing biological samples due to interference from non-target MIR-absorbent molecules, such as water, which can overwhelm the signal from target molecules, especially in transmission and transflection modes, and require precise sample thickness in ATR mode.
Innovation Solution
A sample container with an integrated internal reflection element (IRE) that allows samples to be directly placed on a beam receiving surface, enabling ATR-FTIR analysis without additional handling, using a cap with an IRE mount and a selectively permeable membrane to facilitate target molecule detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmission or transflection mode is used for FTIR analysis, then the technique can analyze samples, but non-target MIR-absorbent molecules (e.g., water) interfere with and overwhelm the signal from target molecules
Solution Approach 1:
The patent combines the IRE directly into the cap structure of the sample container, merging the sampling function with the analysis function. This integration allows the sample to be analyzed in ATR mode without transfer, minimizing exposure to interfering molecules while maintaining signal clarity for target molecules
2Measurement precision
If ATR mode with IRE is used to avoid interference from non-target molecules, then signal clarity improves, but precise control of sample thickness and handling complexity increase
Solution Approach 1:
The IRE is merged into the cap structure, creating an integrated sampling and analysis device. The sample is placed in the container, and the cap with IRE is positioned to contact the sample, automatically establishing the ATR interface without separate handling steps
Solution Approach 2:
The cap serves multiple functions: sealing the sample container and providing the IRE for ATR-FTIR analysis. This multi-functionality eliminates the need for separate sampling devices and simplifies the overall操作流程
3Measurement precision
If ATR mode is used to analyze biofluids with high water content, then analysis of target molecules becomes feasible, but the path length must be precisely controlled within 0.5-2 μm
Solution Approach 1:
The system uses the natural properties of the IRE material and the sample to automatically establish the correct evanescent wave penetration depth. The refractive index mismatch between the IRE and aqueous sample self-regulates the interaction depth within the optimal 0.5-2 μm range without requiring mechanical precision
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 solution enhances the clarity of target molecule signals by minimizing interference from non-target molecules and allows for sensitive analysis of biological samples, including biofluids, without the need for extensive sample preparation, improving diagnostic capabilities and sample handling.
Implementation Method 1
When the light passes through the IRE above an angle defined by the material used to create the IRE (the critical angle), the light is then internally reflected in the IRE towards the detector.
Implementation Method 2
However, when the light meets the IRE-sample interface an evanescent wave is formed which penetrates and is absorbed by the sample. The absorbance of the evanescent wave may be measured by the detector.
Data Source
AI summary
A sample container (100) for use in a ATR-FTIR spectrometer, comprises an internal reflection element “IRE” (101), the IRE comprising a first surface (104) and a second surface (105). The first surface (104) is configured to receive a sample (20) and the second surface (105) is an infrared beam-receiving surface. The IRE (101) forms at least a portion of a wall of the sample container (100), such that in use, when a sample (20) is provided on the first surface (104) of the IRE (101), the sample (20) is provided within the sample container (100).