Combined DLS-SLS Measurement for Particle Density Estimation
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Solution Overview
Problem
Dynamic light scattering (DLS) techniques face limitations in accurately determining particle size and distribution due to the ill-posed nature of mathematical inversion, particularly in pharmaceutical samples, where multiangle DLS is impractical for standard multi-well plates.
Innovation Solution
Combining DLS with static light scattering (SLS) by integrating SLS data through time (SLS-ITT) to enhance the DLS regularization algorithm, using methods like distribution of peak heights, widths, and moments of intensity distributions to constrain the inversion process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiangle DLS is used to improve measurement precision, then particle size and distribution determination is improved, but device complexity and instrumentation cost increase significantly
Solution Approach 1:
The patent combines DLS and SLS measurement techniques into a single integrated system that shares common optical components, sample holders, and detection pathways. This merging approach allows the system to obtain both dynamic and static light scattering data without requiring separate multiangle DLS instrumentation, thereby improving measurement precision while controlling device complexity
Solution Approach 2:
The measurement system is designed with universal components that can perform multiple functions: the same optical system measures both DLS (temporal intensity fluctuations) and SLS (angular intensity distribution) data, and the sample holder can be configured for different measurement modes. This multi-functionality eliminates the need for dedicated multiangle DLS detectors while maintaining comprehensive characterization capability
2Ease of operation
If standard multi-well plate format is used for pharmaceutical samples, then ease of operation and sample compatibility are improved, but multiangle measurement capability is lost
Solution Approach 1:
Instead of attempting multiangle measurement in the angular dimension (which requires multi-well plate configurations), the patent transitions to measuring light scattering in the temporal dimension by moving the detection volume through the sample. This dimensional transformation allows standard multi-well plates to be used while still obtaining SLS information through time-resolved intensity measurements as the detection volume scans across particles
3Productivity
If DLS data inversion is performed without additional constraints, then measurement speed is maintained, but measurement precision deteriorates due to ill-posed mathematical problem
Solution Approach 1:
The patent introduces SLS data as an intermediary constraint that bridges the gap between rapid DLS measurement and accurate inversion. The SLS information (intensity distribution characteristics) serves as an additional constraint equation that complements the DLS autocorrelation data, enabling more precise particle size and distribution determination while maintaining measurement speed through automated combined analysis
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 provides more precise determination of hydrodynamic radius and polydispersity, optimizing formulation and process development in pharmaceutical manufacturing without requiring multiple DLS detectors at multiple angles.
Implementation Method 1
a laser beam is focused into a small volume of solution and the light scattered from the sample is collected by a detector
Implementation Method 2
Random Brownian motion of the scatters (i.e., the molecules in solution) causes the intensity at the detector to vary with time
Data Source
AI summary
A method, system, and apparatus for combining DLS and SLS for number density estimation is disclosed. An example measurement device includes a sample holder containing at least a first sample, a set of optics, and a scanning mechanism to scan the sample holder relative to the set of optics. The example set of optics includes illumination optics. The example set of optics further includes a first detector beam configured for standard dynamic light scattering (DLS). The example set of optics further includes a second detector beam configured for enhancing DLS regularization with static light scattering (SLS) information.