Charged Magnetic Particles for Sperm Cell Separation
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Solution Overview
Problem
Current methods for isolating viable sperm cells are limited by the inability to effectively remove sperm cells compromised by factors other than apoptosis, and existing technologies can negatively impact sperm motility and are costly, making them unsuitable for routine clinical use.
Innovation Solution
A composition and method for magnetic cellular manipulation using particles with a magnetic substrate and a chargeable silicon-containing compound, which selectively bind to damaged or compromised sperm cells, allowing for their separation from viable cells using a magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic cellular separation using annexin V is used to remove apoptotic sperm, then the percentage of membrane intact viable cells increases, but sperm motility is negatively affected and the cost of reagents increases
Solution Approach 1:
The patent changes the binding mechanism from annexin V (which binds to phosphatidylserine on apoptotic cells) to charged magnetic particles that bind based on electrostatic interactions with damaged cell membranes. This parameter change in binding mechanism allows removal of damaged cells while preserving sperm motility, as the charged particles do not interfere with sperm function as much as annexin V does.
Solution Approach 2:
The patent uses simple charged magnetic particles instead of expensive annexin V reagents. These particles can be reused or discarded after a single use, significantly reducing the cost per separation procedure while maintaining effective removal of damaged cells.
2Reliability
If annexin V technology is used for magnetic cellular separation, then apoptotic sperm can be removed, but the binding buffer negatively affects sperm motility and the protocol becomes unsuitable for routine clinical use
Solution Approach 1:
The patent extracts the essential function of annexin V (binding to damaged cell membranes) and implements it through a simpler alternative: charged magnetic particles. This extraction removes the problematic components (annexin V protein and complex binding buffers) while retaining the core separation capability, making the protocol suitable for routine clinical use.
Solution Approach 2:
The patent changes multiple parameters: the binding agent (from annexin V to charged particles), the binding mechanism (from phosphatidylserine recognition to electrostatic interaction), and the buffer composition. These parameter changes collectively eliminate the negative effects on sperm motility while maintaining effective damaged cell removal.
3Reliability
If conventional magnetic separation methods are used, then damaged cells can be removed, but the methods are challenging to implement and lack effectiveness for non-apoptotic damage
Solution Approach 1:
The patent creates a universal charged magnetic particle system that can bind to various types of damaged cell membranes regardless of the specific damage mechanism (apoptotic or non-apoptotic). This multi-functional approach simplifies the methodology while expanding its applicability to all types of membrane-compromised cells.
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 effectively enriches the sample with viable sperm cells by removing damaged cells, thereby improving sperm quality, increasing motility, and reducing embryonic losses, which can lead to higher pregnancy rates.
Implementation Method 1
The magnetic substrate may be characterized by a magnetic susceptibility greater than zero
Implementation Method 2
Each particle in the plurality of particles may include a chargeable silicon-containing compound
Data Source
AI summary
A method for magnetic cellular manipulation may include contacting a composition with a biological sample to form a mixture. The composition may include a plurality of particles. Each particle in the plurality of particles may include a magnetic substrate. The magnetic substrate may be characterized by a magnetic susceptibility greater than zero. The composition may also include a chargeable silicon-containing compound. The chargeable silicon-containing compound may coat at least a portion of the magnetic substrate. The biological sample may include cells and/or cellular structures. The method may also include applying a magnetic field to the mixture to manipulate the composition.