Light Scattering Detector Angular Dissymmetry Radius of Gyration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional light scattering detectors lack sensitivity and resolution to accurately measure the radius of gyration of molecules with a radius less than 10 nm, and increasing laser power or sample cell volume leads to cost issues and peak broadening.
Innovation Solution
A method involving a light scattering detector with specific angular normalization factors and scattering intensity measurements at 90° and 170° angles, along with a 10° angle, to determine the radius of gyration by plotting an angular dissymmetry plot and fitting a line to it, allowing for precise measurement without increasing peak broadening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser power is increased to improve sensitivity, then detection sensitivity is improved, but instrument cost and footprint increase
Solution Approach 1:
The patent changes the detection parameters by measuring scattered light at multiple specific angles (90°, 170°, and 10°) and using angular normalization factors to calculate the radius of gyration. This approach improves sensitivity for small molecules without requiring increased laser power, thereby avoiding the cost and footprint penalties associated with higher power lasers.
2Measurement precision
If sample cell volume is increased to improve scattered light intensity, then detection sensitivity is improved, but peak broadening increases
Solution Approach 1:
The patent transitions from relying on increased sample cell volume to improve sensitivity to a multi-dimensional angular measurement approach. By measuring scattered light at multiple angles (90°, 170°, and 10°) and applying angular normalization, the method achieves improved sensitivity without increasing cell volume, thereby preventing peak broadening.
3Adaptability or versatility
If conventional light scattering detectors are used for small molecules, then measurement capability is limited, but resolution for molecules with radius less than 10 nm is insufficient
Solution Approach 1:
The patent segments the scattered light measurement into multiple angular components (90°, 170°, and 10° measurements) rather than using a single measurement approach. This segmentation allows for more precise determination of the radius of gyration for small molecules with radii less than 10 nm, significantly improving resolution and measurement capability.
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 enhances the sensitivity and resolution of light scattering detectors for measuring small molecules' radius of gyration without the drawbacks of increased peak broadening or high-cost laser power, enabling accurate determination of particles with radii less than 10 nm.
Implementation Method 1
The interaction of the beam of light and the polymers of the effluent produces scattered light. The scattered light is then measured and analyzed for varying attributes, such as intensity and angle
Data Source
AI summary
Methods for determining a radius of gyration of a particle in solution using a light scattering detector are provided. The method may include passing the solution through a flowpath in a sample cell, determining respective angular normalization factors for first and second angles of the detector, obtaining a first scattering intensity of the particle in solution at the first angle, obtaining a second scattering intensity of the particle in solution at the second angle, obtaining a 10° scattering intensity of the particle in solution at an angle of about 10°, determining a first particle scattering factor, determining a second particle scattering factor, plotting an angular dissymmetry plot, fitting a line to the angular dissymmetry plot, determining a slope of the line at a selected location on the line, determining the radius of gyration of the particle in solution from the slope of the line, and outputting the radius of gyration.