Liquid Sample Pretreatment With IMAC Beads for Hemoglobin Interference
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Solution Overview
Problem
Certain assays, particularly bile acid tests, are susceptible to interference from components like hemoglobin, which affect the accuracy of fluorescence or absorbance/reflectance measurements in liquid samples.
Innovation Solution
A method using functionalized particles, such as agarose-based porous beads with immobilized metal affinity chromatography (IMAC) resin, is employed to remove or minimize interfering components like hemoglobin by adhering them to the particles, which are then settled out of the liquid sample using gravity or centrifugation before dispensing the sample on a test slide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hemoglobin is present in the liquid sample, then the sample can be tested directly, but the accuracy of fluorescence or absorbance/reflectance measurements is compromised
Solution Approach 1:
The patent extracts and removes hemoglobin from the liquid sample using a magnetic bead-based system. The magnetic beads are functionalized to specifically bind hemoglobin, allowing it to be separated from the sample matrix through magnetic separation. This extraction process eliminates the interfering substance while preserving the analyte of interest, thereby resolving the contradiction between maintaining measurement accuracy and dealing with hemoglobin interference.
Solution Approach 2:
The patent introduces magnetic beads as an intermediary substance that mediates the removal of hemoglobin. These beads are functionalized with ligands that specifically interact with hemoglobin, acting as a bridge between the interfering substance and the separation mechanism. The magnetic beads enable selective binding and subsequent magnetic separation, allowing hemoglobin to be removed without affecting other sample components, thus resolving the measurement accuracy issue.
2Object-affected harmful factors
If a new hemoglobin-resistant assay formulation is developed, then interference is eliminated, but extensive time and expense are required
Solution Approach 1:
The patent applies preliminary action by removing hemoglobin from the sample before the actual assay is performed. Instead of developing a new assay formulation that is resistant to hemoglobin interference, the method pre-treats the sample by extracting and removing the interfering substance. This preliminary purification step allows the use of existing, well-established assay formulations, thereby avoiding the extensive time and expense of developing new hemoglobin-resistant assays while still eliminating the interference problem.
3Measurement precision
If magnetic bead separation is used to remove hemoglobin, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical separation systems with a magnetic field-based separation mechanism. Instead of using centrifugation, filtration, or other mechanical separation methods that require complex equipment and multiple steps, the invention uses magnetic beads that can be separated by applying a magnetic field. This substitution simplifies the overall device complexity while maintaining effective hemoglobin removal and measurement accuracy, as magnetic separation requires only a magnet and minimal mechanical intervention.
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 significantly reduces the concentration of interfering components, allowing accurate measurements to be taken on conventional test slides without the need for modifying the assay, thus avoiding time and expense.
Implementation Method 1
functionalized particles, such as agarose-based porous beads with immobilized metal affinity chromatography (IMAC) resin, is employed to remove or minimize interfering components like hemoglobin by adhering them to the particles
Implementation Method 2
which are then settled out of the liquid sample using gravity or centrifugation before dispensing the sample on a test slide
Implementation Method 3
which are then settled out of the liquid sample using gravity or centrifugation before dispensing the sample on a test slide
Data Source
AI summary
A method using a chemical analyzer for removing a component of a liquid sample which may interfere with a test performed on a test assay includes the steps of adding the liquid sample to a sample cup, transferring a volume of the liquid sample to a mixing cup containing an IMAC (Immobilized Metal Affinity Chromatography) resin containing porous beads to form a sample/resin solution in the mixing cup, using a pipette of the chemical analyzer to repeatedly aspirate the sample/resin solution into a disposable pipette tip of the pipette and expelling the sample/resin solution from the pipette tip into the mixing cup to achieve a mixed sample/resin solution in the mixing cup, and allowing the mixed sample/resin solution in the mixing cup to rest undisturbed so that the interfering component of the liquid sample adheres to the porous beads and the beads settle to a bottom portion of the mixing cup, resulting in a refined liquid sample devoid of the interfering component and occupying an upper portion of the mixing cup for later dispensing on the test assay.