2D-IR Spectroscopy for Aqueous Fluid Analysis
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Solution Overview
Problem
Current IR spectroscopic methods for analyzing aqueous liquids, such as biofluids, are hindered by the strong absorption of water, which masks the peaks of other components, making it difficult to accurately determine protein concentrations and ratios like albumin to globulin (AGR) in blood serum without complex sample preparation or post-processing.
Innovation Solution
The use of 2D-IR spectroscopy with a specific sequence of IR pulses suppresses the water signal, enhancing the resolution of protein peaks and allowing for direct, quantitative analysis of aqueous biofluids without pre-treatment or complex data analysis, by leveraging the non-linear optical technique to separate protein signals from water signals based on their relaxation timescales and transition dipole moments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional IR spectroscopy is used to analyze aqueous biofluids, then the method is simple and direct, but the water absorption peaks dominate and mask the protein peaks, making accurate analysis impossible
Solution Approach 1:
The patent extracts and removes the water signal from the IR spectrum by measuring the water absorption separately and subtracting it from the total spectrum, thereby isolating the protein peaks from the dominating water background
Solution Approach 2:
The patent changes the measurement parameters by using difference spectroscopy and analyzing specific frequency regions (such as the amide I band region) where protein signals emerge after water subtraction, transforming the unusable dominated spectrum into analyzable data
2Measurement precision
If sample preparation or complex post-processing is performed to overcome water interference, then protein analysis accuracy improves, but the method complexity and time consumption increase
Solution Approach 1:
The patent enables the system to self-correct for water interference by using the water signal itself as a reference for subtraction, eliminating the need for external sample preparation steps or complex computational algorithms
Solution Approach 2:
The patent performs preliminary measurement of the water spectrum separately and stores it for subtraction, preparing the correction data in advance to simplify the main analysis process
3Adaptability or versatility
If conventional IR spectroscopy is used on aqueous samples, then the setup is simple, but the water peaks mask all other components, limiting analytical usefulness
Solution Approach 1:
The patent converts the harmful water absorption into a useful reference signal by measuring and subtracting the water spectrum, thereby transforming the dominating interference into a tool for revealing the hidden protein information
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 enables accurate and straightforward measurement of protein concentrations and ratios in biofluids, improving diagnostic capabilities by providing a label-free, fast, and robust method for analyzing biofluids, including the determination of AGR, with high precision and minimal sample preparation.
Implementation Method 1
obtaining a 2D-IR spectrum of a sample of the fluid using a 2D-IR spectrometer configured to apply a sequence of IR pulses to the sample
Implementation Method 2
leveraging the non-linear optical technique to separate protein signals from water signals based on their relaxation timescales and transition dipole moments
Implementation Method 3
IR spectroscopy involves irradiating a sample with IR radiation to produce an absorbance spectrum which provides vibrational information characteristic of molecules in the sample
Data Source
Figure 1~1(b)
Figure 2(a)~2(e)
Figure 3(a)~3(f)
AI summary
A method of analysing an aqueous fluid comprising obtaining a 2D-IR spectrum of a sample of the aqueous fluid using a 2D-IR spectrometer configured to apply a sequence of IR pulses to the sample, wherein the sequence comprises a pump process followed by a probe pulse, where the pump process is a single pump pulse or a sequence of a first pump pulse and a second pump pulse, and a waiting time Tw between applying the single pump pulse or the second pump pulse and applying the probe pulse is from 150 to 350 fs.