HPLC Analysis Device Holding Time Adjustment
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Solution Overview
Problem
In high-performance liquid chromatography (HPLC) systems with multiple streams connected to a single detector, variations in peak appearance times across streams due to pipe length and diameter tolerances lead to detection timing deviations, making it difficult to maintain consistent analysis without adjusting pipe lengths and requiring time-consuming troubleshooting for issues like column degradation and clogging.
Innovation Solution
An analysis apparatus with verification flow paths allows for adjusting holding times and determining stream degradation without pipe removal, using a control unit to correct set values based on verification sample holding times and pressure measurements, ensuring consistent peak detection across streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple HPLC streams are connected to a single detector through a stream select valve, then analysis throughput is improved, but detection timing deviations occur due to pipe length and diameter tolerances
Solution Approach 1:
The patent adjusts operating parameters (flow rates, gradient conditions) of individual HPLC streams to compensate for physical variations in pipe dimensions. By changing operational parameters rather than physical dimensions, the system achieves synchronized peak detection across multiple streams despite manufacturing tolerances in pipe length and diameter.
Solution Approach 2:
The system uses feedback from actual peak detection timing to dynamically adjust stream parameters. The control device monitors when peaks appear in each stream and modifies flow rates or gradient conditions in real-time to synchronize detection timing, ensuring consistent analysis across all streams connected to the shared detector.
2Manufacturing precision
If pipe lengths are adjusted to compensate for tolerance variations, then detection timing consistency is improved, but device complexity and troubleshooting difficulty increase
Solution Approach 1:
The patent replaces mechanical adjustments (physical pipe length modifications) with operational parameter adjustments (flow rates, gradient conditions). This substitution maintains detection timing consistency while avoiding the complexity of customizing physical pipe configurations for each stream, making the system easier to assemble and troubleshoot.
Solution Approach 2:
Instead of static pipe length adjustments, the system uses dynamic parameter changes during operation. Flow rates and gradient conditions can be modified on-the-fly to compensate for timing deviations, providing flexibility without requiring permanent physical modifications to the piping system.
3Manufacturing precision
If verification flow paths are added to each stream, then holding time adjustment capability is improved, but device complexity increases
Solution Approach 1:
The patent divides each HPLC stream into separate functional segments, including verification flow paths that can be independently controlled. This segmentation allows precise holding time adjustment for each stream while maintaining modular architecture, making the added complexity manageable through standardized components and control routines.
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 solution enables precise adjustment of holding times and detection timing across multiple HPLC streams without altering pipe lengths, reducing detection timing deviations and facilitating the identification of stream issues like column degradation and clogging, thereby improving analysis efficiency and reliability.
Implementation Method 1
The separation column is obtained by filling a thin cylindrical container at a high pressure with a filler of particles that bind various functional groups to a base material such as silica gel or polymer gel. The chromatography is a method of distributing various materials at a certain ratio due to a difference in affinity (interaction) between a stationary phase and a mobile phase that carries the materials through the stationary phase and separating the materials using a difference in ratio between the materials.
Implementation Method 2
The liquid delivery pump performs gradient liquid delivery of holding and delivering a plurality of mobile phases to the separation column while changing a mixing ratio per hour. In high performance liquid chromatography (HPLC), liquid is used as the mobile phase.
Data Source
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AI summary
An analysis apparatus capable of adjusting holding time of each stream in a plurality of HPLC streams without adjusting a pipe length, and capable of determining degradation of a separation column, a liquid-delivery failure, or the like without removing a pipe from the apparatus is implemented. Air is suctioned from the shipper 109 and injected into the verification flow paths 122 and 123, and holding time when a baseline of the detector 125 changes is stored in the control unit 130. The air in the verification flow paths 122 and 123 of the stream 101 and the stream 102 is measured, and holding time of the stream 101 and holding time of the stream 102 are compared to determine whether or not there is a difference of 1 second or more in the holding time. When the difference in holding time is 1 second or more, correction is performed. Holding time information of the same verification flow paths 122 and 123 in the stream 101 and the stream 102 are compared with holding time information stored in the control unit 130 and correction is performed when the difference in holding time is 1 second or more.