High-Throughput Zeta Potential Measurement via Segmented Optical Chambers
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Solution Overview
Problem
Current instruments for measuring electrophoretic mobility and zeta potential of particles are limited in their ability to rapidly assess multiple samples, particularly in high-throughput settings, such as different binding proteins or ligand particles, and are prone to cross-contamination due to the need to handle individual samples sequentially.
Innovation Solution
A high-throughput optical suspension characterization instrument featuring hydraulically separate and transparent sample containers with a selection mechanism for directing light and detecting scattered light, including motorized stages, electrodes, and optical couplers, enables simultaneous measurement of multiple samples using laser Doppler or imaging techniques, allowing for rapid determination of zeta potential and electrophoretic mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current instruments measure individual samples sequentially, then measurement accuracy is maintained, but measurement throughput is limited and cross-contamination risk increases
Solution Approach 1:
The instrument divides the sample measurement process into multiple independent measurement chambers arranged in an array, where each chamber is hydraulically separated and can be measured independently. This segmentation allows parallel measurement of multiple samples while maintaining isolation between them, thus increasing throughput without compromising reliability.
Solution Approach 2:
The instrument combines multiple measurement chambers into a single integrated platform with shared optical and control systems. By merging the measurement capabilities across multiple chambers while maintaining hydraulic separation, the system achieves high-throughput parallel measurement without cross-contamination between samples.
2Loss of time
If multiple samples are measured sequentially, then cross-contamination is avoided, but measurement time increases significantly
Solution Approach 1:
The instrument implements periodic action by systematically cycling through multiple measurement chambers in a structured sequence, allowing rapid sequential access to different samples. This periodic measurement approach, combined with automated sample handling, dramatically reduces total measurement time while maintaining measurement integrity.
Solution Approach 2:
The instrument maintains continuity of useful action by enabling uninterrupted parallel measurement across multiple chambers. The automated system continuously performs measurements across all chambers without idle time between samples, maximizing productivity while the hydraulic separation ensures no cross-contamination occurs during the continuous measurement process.
3Ease of operation
If sample containers are hydraulically connected for easy handling, then operational ease is improved, but cross-contamination between samples occurs
Solution Approach 1:
The sample container system is segmented into multiple hydraulically independent chambers that are physically separated. Each chamber maintains its own hydraulic isolation while being part of the same array structure, allowing easy handling of the entire array without compromising the hydraulic separation that prevents cross-contamination.
Solution Approach 2:
The instrument introduces an intermediary automated handling system that interfaces with the hydraulically separated chambers. This intermediary system enables easy operation and sample replacement without requiring direct manual manipulation that could compromise hydraulic separation, thus maintaining both ease of operation and prevention of cross-contamination.
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 rapid, high-throughput measurement of zeta potential and electrophoretic mobility for multiple samples without cross-contamination, improving efficiency and reducing measurement time, while maintaining accuracy in detecting changes in particle characteristics.
Implementation Method 1
an off-axis scattering detector is responsive to scattered light from the light source after it has interacted with a sample
Implementation Method 2
The light source can be a laser
Implementation Method 3
Measurements of the zeta potential of a particle or molecule reflect the state of charge at the hydrodynamic plane where the particle diffuses in the bulk fluid of a suspension. This diffusion is a random process dependant on particle size; when an electric field is applied there is also a directed component in the field direction
Data Source
AI summary
A high-throughput optical suspension characterization instrument is disclosed, which can include hydraulically separate and at least partially transparent sample containers. A selection mechanism is operative to selectively direct light from a light source (12) through different ones of the sample containers along an optical axis, and an off-axis scattering detector (38,24) is responsive to scattered light from the light source after it has interacted with a sample. Phase analysis light scattering is used to determine the electrophoretic mobility and zeta potential of samples. A second instrument is disclosed, wherein all sample containers are illuminated simultaneously. Transmitted light is collected by a camera. The electrophoretic mobility and hydrodynamic size of the samples may be determined.