Magnetic WBC Isolation via Viscosity Reduction
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Solution Overview
Problem
Current methods for isolating white blood cells from whole blood, such as gradient separation and RBC lysis, face challenges in achieving high viability, yield, and purity due to the overwhelming presence of red blood cells and viscosity issues, making automation and reproducibility difficult.
Innovation Solution
A method involving decreasing the viscosity of the blood sample, agitating it to improve magnetic particle binding, and using a magnetic field to isolate white blood cells with specific magnetic particles, allowing for high yield, purity, and viability, and enabling automation of the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gradient separation methods are used to separate RBCs from WBCs, then separation can be achieved, but the process is slow, difficult to automate, and produces poor cell viability and yield
Solution Approach 1:
The patent replaces mechanical gradient separation methods with magnetic field-based separation. Magnetic particles conjugated to antibodies bind to WBCs, and a magnetic field rapidly separates these bound cells from RBCs without requiring centrifugation or manual manipulation of density gradients, thereby enabling automation and improving cell viability.
Solution Approach 2:
The patent changes the physical-chemical parameters of the separation process by using magnetic susceptibility instead of density. By conjugating magnetic particles to WBC-specific antibodies, the method exploits magnetic field interaction rather than density-based centrifugation, allowing for faster, more automated separation with better preservation of cell viability.
2Productivity
If direct RBC lysis methods are used, then RBCs can be removed quickly, but WBC viability and purity are compromised due to damage from osmolarity changes
Solution Approach 1:
The patent extracts and removes RBCs from the blood sample through magnetic field separation of WBCs. By binding magnetic particles to WBCs and applying a magnetic field, RBCs are left behind in the supernatant while WBCs are retained on the magnetic bead complex, enabling rapid separation without exposing cells to lytic conditions.
Solution Approach 2:
The patent introduces magnetic particles as an intermediary between the antibody and the WBC. These particles serve as a bridge that allows specific binding to WBC surface markers while providing a magnetic handle for separation, avoiding direct exposure of WBCs to harsh chemical conditions used in RBC lysis methods.
3Reliability
If magnetic particle methods are used for WBC separation, then higher quality preparations can be obtained, but reproducibility of high viability and yield remains difficult to achieve
Solution Approach 1:
The patent performs preliminary actions by optimizing and standardizing the magnetic particle binding conditions, incubation times, and magnetic field application parameters before separation. This pre-optimization ensures that subsequent separations are reproducible and achieve consistent high viability and yield results.
Solution Approach 2:
The patent implements feedback mechanisms by monitoring separation efficiency, cell viability, and yield metrics to optimize and standardize the magnetic separation protocol. This allows for consistent reproduction of high-quality WBC preparations by adjusting parameters based on measured outcomes.
4Quantity of substance
If whole blood is used directly for separation, then the starting material is available, but the high viscosity and RBC density hamper effective WBC isolation
Solution Approach 1:
The patent replaces density-based mechanical separation with magnetic field-based separation. This substitution overcomes the limitations of high blood viscosity and RBC density by using magnetic susceptibility of bead-bound WBCs, allowing efficient isolation without requiring the sample to be less viscous or less dense.
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
The method achieves white blood cell preparations with over 80% viability, 90% yield, and 95% purity, facilitating high-quality cell isolation and automation, improving reproducibility and efficiency in clinical and research applications.
Implementation Method 1
contacting the sample with a magnetic particle that binds specifically to white blood cells or a subset of white blood cells to provide a white blood cell/magnetic particle complex; isolating the white blood cell/magnetic particle complex by subjecting the white blood cell/magnetic particle complex to a magnetic field
Data Source
AI summary
The invention relates to methods of isolating white blood cells (WBCs) from a sample, e.g., whole blood, using magnetic particles that specifically bind to WBCs and a series of specific steps and conditions. The methods can include one or more of decreasing the viscosity of the sample prior to WBC isolation, agitating the sample at specified frequencies, and/or using a sample container arranged such that all of the sample is placed in close proximity (e.g., within 5, 2, 1, or 0.5 mm) to the source of the magnetic field. The new methods provide for isolation of WBC preparations with high yield, purity, and viability. The methods are designed for compatibility with automation protocols for rapid processing of multiple samples.