Supercritical Fluid Chromatography Laser Wave Mixing Detection
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Solution Overview
Problem
Current methods for analyzing small quantities of analytes, such as chiral compounds and proteins, face limitations in sensitivity, selectivity, and throughput, particularly in achieving detection levels below attomoles and yoctomoles, and generate significant waste and require extensive resources.
Innovation Solution
Combining laser wave mixing technology with supercritical fluid chromatography (SFC) diagnostic flow technology, utilizing a quadrupled Nd:YAG laser beam at a unique UV wavelength of 266 nm for non-linear wave mixing in a nanoliter flow cell, enabling detection down to yoctomole levels with high sensitivity and selectivity, and reducing waste streams by 80% compared to conventional methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional chromatography methods are used to analyze small quantities of analytes, then detection sensitivity is limited to attomole levels, but achieving higher sensitivity requires complex apparatus and extensive resources
Solution Approach 1:
The patent combines supercritical fluid chromatography (SFC) with laser wave mixing detection to achieve yoctomole-level sensitivity. The SFC system separates analytes while the laser wave mixing detector provides ultra-sensitive detection by mixing multiple laser beams in a nonlinear optical medium, creating a grating that diffracts light proportional to analyte concentration. This merger achieves high sensitivity without requiring excessively complex apparatus.
Solution Approach 2:
The patent changes the detection parameter from conventional absorbance or fluorescence to nonlinear optical wave mixing signals. By using multiple laser beams at specific wavelengths and angles to create interference patterns in the presence of analytes, the system achieves yoctomole detection limits. The supercritical fluid phase also changes solubility and separation parameters, improving overall detection efficiency.
2Loss of substance
If conventional chromatography methods are used, then significant waste is generated, but reducing waste requires advanced techniques that are not yet widely available
Solution Approach 1:
The patent utilizes supercritical fluid phase transitions to reduce waste. Supercritical CO2 is used as the mobile phase, which can be easily depressurized back to gaseous state after analysis, leaving no liquid waste. The analytes are recovered by simple pressure reduction, and the CO2 can be recycled. This phase transition approach eliminates the need for large volumes of organic solvents required in conventional HPLC methods.
3Productivity
If conventional detection methods are used, then analysis time is extended, but reducing analysis time requires high-speed techniques that may compromise sensitivity
Solution Approach 1:
The patent uses pulsed laser beams for wave mixing detection instead of continuous illumination. The periodic pulsed action allows for time-gated detection, where signals are collected during specific time windows when analytes are in the detection cell. This reduces background noise and enables faster data acquisition rates while maintaining yoctomole sensitivity, as each pulse generates a discrete measurable signal.
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 combination achieves 100% optical collection efficiency, significantly reducing analysis time and material usage, allowing for miniaturization of equipment and increased efficiency in pharmaceutical, environmental, forensic, and anti-terrorism applications, while maintaining high sensitivity and selectivity.
Implementation Method 1
laser wave mixing technology with supercritical fluid chromatography (SFC) diagnostic flow technology, utilizing a quadrupled Nd:YAG laser beam at a unique UV wavelength of 266 nm for non-linear wave mixing in a nanoliter flow cell
Implementation Method 2
utilizing a quadrupled Nd:YAG laser beam at a unique UV wavelength of 266 nm for non-linear wave mixing in a nanoliter flow cell
Implementation Method 3
supercritical fluid chromatography (SFC) diagnostic flow technology
Data Source
AI summary
This invention relates to methods and apparatus of a combination of laser wave mixing technology with diagnostic flow technologies with embodiments describing supercritical fluid chromatography. The combination of these technologies along with minute detection levels have not yet been seen in the field.