Online HPLC Dissolution Testing via Direct Autosampler Injection
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Solution Overview
Problem
Conventional online HPLC dissolution test systems face inefficiencies due to the slow analysis speed of liquid chromatographs, which cannot keep pace with the sampling speed of dissolution testers, leading to poor test efficiency, especially when dealing with multiple components or complex samples.
Innovation Solution
The system incorporates an autosampler with a sampling needle and flow vial to directly inject the sample solution into the analysis channel, eliminating the need for a collection container and allowing for immediate analysis, and includes a mode selector for choosing between immediate and collection analyzing modes, enabling higher efficiency and flexibility in dissolution testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional liquid chromatograph is used with a collection container for temporary sample storage, then the system can handle slow analysis speed, but the dissolution test efficiency is poor due to the inability to keep pace with sampling speed
Solution Approach 1:
The invention extracts and eliminates the collection container from the system, creating a direct connection between the dissolution tester and liquid chromatograph. This removal of the intermediate storage component enables continuous sample transfer and eliminates the bottleneck of temporary storage, allowing the analysis speed to match the sampling speed and significantly improving dissolution test efficiency
Solution Approach 2:
The invention implements continuous sample transfer from the dissolution tester directly to the liquid chromatograph through an automated sampling system. The dissolution tester supplies sample solution continuously at preset timings, and the liquid chromatograph analyzes samples continuously without interruption or temporary storage, maintaining continuous useful action throughout the system and eliminating idle time between sampling and analysis
2Ease of operation
If a collection container is used to temporarily store sample solutions, then samples can be stored for later analysis, but the system complexity increases and operation efficiency decreases
Solution Approach 1:
The invention removes the collection container component entirely from the system architecture. By eliminating this intermediate storage device, the system complexity is reduced in terms of hardware components, piping, and control logic. The direct connection between dissolution tester and liquid chromatograph simplifies the overall system structure while improving operation efficiency through automated continuous sampling
Solution Approach 2:
The invention merges the sampling function directly into the liquid chromatograph's autosampler, which then directly receives sample solution from the dissolution tester. This consolidation eliminates the separate collection container stage and integrates the sampling- analysis workflow into a streamlined continuous process, reducing system complexity and improving ease of operation
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 configuration allows for rapid analysis of sample solutions, increasing the efficiency of dissolution testing and enabling continuous, fully automatic testing of multiple samples without operator intervention, as the system can determine when the liquid chromatograph is ready for the next sample.
Implementation Method 1
an analysis column separating individual components in the sample solution injected into the analysis channel by the autosampler
Implementation Method 2
the sampling needle is for collecting the sample solution by sucking from the flow vial
Data Source
AI summary
An online HPLC dissolution test system includes a dissolution tester and a liquid chromatograph. An autosampler of the liquid chromatograph includes at least one flow vial, a sampling needle and an injection port. the flow vial is connected to the dissolution tester via a pipe and is for storing a sample solution supplied from the dissolution tester therein. The sampling needle is for collecting the sample solution by sucking from the flow vial. The injection port is for injecting the sample solution from the sampling needle into the analysis channel. The controller of the liquid chromatograph includes an immediate analyzing execution part configured to cause the autosampler to execute immediate analyzing operation for sucking the sample solution in the flow vial with the sampling needle and directly injecting the sample solution into the injection port when the sample solution is supplied from the dissolution tester to the flow vial.