Portable UPLC Binary-Pump Architecture for High-Pressure Gradients
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Solution Overview
Problem
Conventional UPLC systems are large and limited to laboratory use, lacking a portable and compact design capable of withstanding high pressures and providing both isocratic and gradient elution for efficient chemical separation.
Innovation Solution
A portable UPLC system with a six-port valve, binary pump, and optical fiber flow cell, capable of withstanding pressures up to 15,000 psi, featuring isocratic and gradient elution, and enhanced detection sensitivity using LED detectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional UPLC systems are used to achieve high pressure resistance (15,000 psi) and improved resolution, then the analysis performance is improved, but the system size becomes large and it is limited to laboratory use
Solution Approach 1:
The UPLC system is divided into separate functional modules: binary pump unit, autosampler, column oven, detector, and control system. Each module operates independently but connects through standardized interfaces, allowing the system to maintain high pressure performance while reducing overall footprint and enabling portable deployment
Solution Approach 2:
The system transitions from traditional horizontal laboratory benchtop configuration to a compact vertical integration design. The binary pump delivers mobile phase vertically through stacked components, maximizing space utilization and achieving lab-quality performance in a portable form factor
2Measurement precision
If conventional UPLC systems are used to achieve high pressure resistance (15,000 psi), then the separation performance is improved, but the system becomes complex and expensive
Solution Approach 1:
The binary pump system serves multiple functions: it can deliver isocratic mobile phase compositions, perform gradient elution, and switch between different flow rates. The integrated autosampler and column oven further reduce the number of separate components needed, simplifying the overall system while maintaining high separation performance
Solution Approach 2:
Multiple functions are combined into single components: the binary pump integrates gradient mixing and flow delivery, the autosampler combines sample loading with loop switching, and the column oven integrates temperature control with column protection. This merging reduces component count and system complexity
3Weight of moving object
If portable design is implemented to reduce system size and weight, then portability is improved, but the pressure resistance capability may be compromised
Solution Approach 1:
High-pressure resistant materials and designs are applied selectively to components that require it (pump chambers, valves, columns, detector flow cell) while other components use lighter materials. This localized approach maintains pressure resistance where needed while minimizing overall system weight for portability
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
Enables high-resolution, portable chemical analysis with sensitivity reaching parts per billion, suitable for field applications and diverse sample types, including illegal drugs and industrial chemicals.
Implementation Method 1
enhanced detection sensitivity using LED detectors
Implementation Method 2
capable of withstanding pressures up to 15,000 psi
Implementation Method 3
Liquid chromatography is a common technique used for the chemical separation of sample with mixtures of compounds
Implementation Method 4
the retention time for various chemicals in the stationary phase is different
Data Source
AI summary
An UPLC can offer the advantages of improved resolution, shorter analysis time, reduced solvent consumption, and easy connectivity to a mass spectrometer. One of our unique approaches is to use four small linear pumps to achieve gradient elution. We use four binary pumps to achieve continuous gradient elution. We designed an on-line degassing to greatly reduce interference from gas bubbles, thereby maintaining stable pressure. The range of flow speed is controlled from 300 nl/min to 100 ul/min. This portable UPLC can withstand pressures of 15,000 psi or higher. Its size is 30 cm×30 cm×30 cm, and it weighs less than 20 kg. This portable UPLC is equipped with an LED detector, which reduces both cost and system size and has higher sensitivity than a spectrophotometer. We also have the option to easily switch to a conventional detector with a discharge light source and a grating spectrophotometer.