Fluid Delivery System Calibration via Absorbance Spectroscopy
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Solution Overview
Problem
Fluid delivery systems in liquid chromatography face challenges in calibrating the mixing of multiple buffers, as existing systems often have tightly coupled buffer intake and mixing, making it difficult to measure and control the exact proportions of buffers arriving at the column, which is crucial for precise control of sample binding and elution.
Innovation Solution
A method involving a fluid delivery system connected to multiple input streams, where test solutions with distinct dyes are injected and mixed, allowing absorbance measurements at specific wavelengths to calibrate the system by comparing input and output absorbances, thereby adjusting the operation to achieve the desired proportions of each buffer in the output stream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If buffer intake and mixing are tightly coupled in the fluid delivery system, then the system operation is simplified, but the ability to measure and control exact buffer proportions is lost
Solution Approach 1:
The patent segments the buffer delivery system into separate intake and mixing components. By decoupling these functions, the system allows individual buffers to be drawn from source containers through separate channels before combining them at the mixing chamber, enabling independent measurement and control of each buffer's flow rate and proportion.
Solution Approach 2:
The patent introduces an intermediary measurement device (such as a flow meter or detector) positioned in the buffer delivery path between the source containers and the mixing chamber. This intermediary component enables real-time monitoring and measurement of buffer flow rates, providing the data needed to control exact buffer proportions without disrupting the overall system operation.
2Measurement precision
If balances and additional equipment are added to measure buffer rates, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent integrates the measurement function into existing system components rather than adding separate dedicated measurement devices. For example, the system may use the existing detector already present for chromatographic analysis to also measure buffer flow rates, or employ flow meters that serve dual purposes in both measurement and flow control, thereby achieving precise measurement without proportionally increasing device complexity.
Solution Approach 2:
The patent implements self-measuring capabilities where the system uses its own operational parameters (such as pump rotation speed, voltage, or current) to infer buffer flow rates. By leveraging existing system data and components, the measurement function is achieved without requiring external balances or specialized measurement equipment, thus avoiding increased device complexity.
3Device complexity
If multiple buffers are mixed together immediately upon intake, then the system structure is simplified, but the ability to control binding and elution timing is reduced
Solution Approach 1:
The patent implements dynamic control of the mixing process, allowing the system to adjust buffer proportions and mixing timing in real-time based on the chromatographic cycle requirements. The mixing chamber is designed to receive buffers at variable rates and combine them dynamically, enabling precise control over when different buffer compositions are delivered to the column for binding versus elution phases.
Solution Approach 2:
The patent allows buffers to be prepared and measured separately before mixing, with the capability to pre-condition buffers (such as adjusting pH or temperature) independently before they enter the mixing chamber. This preliminary action enables the system to have buffers ready with specific properties that will be combined in controlled proportions at the appropriate time for binding or elution, enhancing precision without requiring complex structural changes.
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 precise calibration of the fluid delivery system, ensuring accurate mixing and control of buffer proportions, leading to improved performance in liquid chromatography by minimizing disparities in buffer delivery and enhancing the precision of sample binding and elution processes.
Implementation Method 1
obtaining N test solutions, where each test solution includes a dye having a characteristic wavelength of maximum absorbance (λmax)... measuring the absorbance of the output stream at N wavelengths, the wavelengths being the λtests designated for the test solutions
Data Source
AI summary
Methods, articles of manufacture, and kits for calibrating fluid delivery systems are provided. A fluid delivery system connected to N input streams, where N is an integer greater than or equal to 2, mixes together fluid from the N input streams to form an output stream. The methods involve obtaining N test solutions, each containing a dye, providing optical absorbances of the test solutions at appropriate wavelengths, injecting the test solutions into the input streams, mixing the test solutions, and measuring the absorbance of the output stream at the same wavelengths. The methods also involve comparing the absorbances of the test solutions with the absorbances of the output stream, which can include calculating ratios and comparing the ratios with target values. The methods can further involve adjusting operation of the fluid delivery system based upon the absorbances. In some embodiments, the dyes have largely non-overlapping absorbance spectra.