Strong-Solvent Sample Bracketing for Accurate Fluid Separation
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Solution Overview
Problem
Guiding a fluidic sample through conduits without artifacts and ensuring accurate separation in sample separation devices is challenging due to issues like sample adsorption to conduit walls, carryover, and precipitation.
Innovation Solution
The fluidic sample is bracketed between mobile phase portions with higher solvent strength than the sample itself, using a control unit to manage solvent strength profiles, ensuring direct contact and subsequent adjustment to prevent adsorption and facilitate focused separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluidic sample is guided through conduits using conventional mobile phase, then the sample can be transported to the separation unit, but sample adsorption to conduit walls and carryover occur causing artifacts and reduced separation accuracy
Solution Approach 1:
A mobile phase portion with higher solvent strength is introduced as an intermediary between the sample loop and the separation unit. This strong solvent mobile phase acts as a mediator that prevents sample molecules from adsorbing to conduit walls and eliminates carryover, thereby ensuring accurate separation without artifacts
Solution Approach 2:
The solvent strength parameter of the mobile phase is changed by introducing a mobile phase portion with higher solvent strength than the original mobile phase. This parameter change creates a protective effect that prevents sample loss and carryover while maintaining separation accuracy
2Reliability
If mobile phase with higher solvent strength is used to prevent sample adsorption, then sample loss and carryover are reduced, but the complexity of mobile phase management increases
Solution Approach 1:
The mobile phase flow is segmented into distinct portions: a first mobile phase portion with higher solvent strength before the sample, the sample itself, and a second mobile phase portion with higher solvent strength after the sample. This segmentation allows each portion to perform its specific function while managing complexity through structured organization
Solution Approach 2:
The mobile phase portion with higher solvent strength is introduced preliminarily before the sample enters the separation unit. This preliminary action prepares the conduit system by preventing sample adsorption in advance, eliminating the need for complex real-time adjustments during separation
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 method effectively prevents sample loss, carryover, and precipitation while ensuring proper focusing and separation of the fluidic sample on the stationary phase, enhancing separation accuracy and efficiency.
Implementation Method 1
at least one of the mobile phase portions is arranged directly next to the fluidic sample and has a higher solvent strength compared to a solvent of the fluidic sample
Implementation Method 2
a sample separation unit for separating the fluidic sample in the mobile phase
Data Source
AI summary
A sample separation device for separating a fluidic sample includes a fluid drive for driving a mobile phase and the fluidic sample when injected in the mobile phase, a sample separation unit for separating the fluidic sample in the mobile phase, and a control unit configured for bracketing the fluidic sample between two mobile phase portions of the mobile phase. At least one of the mobile phase portions is arranged directly next to the fluidic sample and has a higher solvent strength compared to a solvent of the fluidic sample.