Hydrogel Coated Shaped Articles for Cell Capture
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Solution Overview
Problem
Current cellular isolation and purification techniques often cause cell damage and alter the behavior and chemical makeup of cells due to excessive physical or chemical perturbations, and existing automation platforms have limited recovery and yield, hindering the study of rare cells and proteins in heterogeneous tissue samples.
Innovation Solution
Shaped articles with a hydrogel coating composed of alginic acid conjugated to polyalkylene oxide and a binding moiety, such as antibodies, are used for specific cell capture and release, allowing for targeted separation and purification without extensive perturbations, utilizing cation crosslinking for gel formation and chelators for release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fluid shear forces are applied to detach adhered cells, then cell detachment is achieved, but cell damage and reduced viability occur
Solution Approach 1:
The patent introduces an intermediary mechanism (reversible protein ligand binding to capture surface) between the cell and the surface, allowing detachment without direct mechanical shear forces. The ligand acts as a mediator that can be selectively cleaved or deactivated to release cells gently, avoiding the harmful direct application of fluid shear forces while maintaining effective cell detachment capability
Solution Approach 2:
The invention replaces the mechanical cell detachment method (fluid shear forces) with a biochemical mechanism (enzymatic cleavage of protein ligands or reversible binding interactions). This substitution allows cell release through chemical means rather than mechanical stress, thereby maintaining cell viability while achieving effective detachment
2Ease of operation
If enzymatic digestion is used to cleave protein ligands, then cell release is achieved, but morphological changes and cellular activity loss occur
Solution Approach 1:
The patent employs parameter changes by using mild, selective chemical agents or reversible binding mechanisms instead of aggressive enzymatic digestion. The binding between capture surface and cells is designed to be reversible through changes in pH, ionic strength, or specific chemical triggers that do not denature proteins or damage cell membranes, thus releasing cells while preserving their morphology and activity
Solution Approach 2:
The invention uses disposable, biocompatible coating materials that can be easily applied and removed without damaging cells. These coatings are designed to be non-toxic and mechanically gentle, serving as single-use capture surfaces that prioritize cell integrity over reagent reusability, thereby avoiding the harmful effects of repeated enzymatic treatments
3Productivity
If current automation platforms are used for purification, then processing efficiency is improved, but recovery and yield are limited
Solution Approach 1:
The patent employs porous hydrogel beads as the capture medium, which provide high surface area and porosity for efficient cell binding while maintaining biocompatibility. The porous structure allows cells to be captured effectively and released with high recovery, overcoming the yield limitations of conventional automation platforms while maintaining processing efficiency through automated bead handling
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 hydrogel coating effectively captures and releases cells with high specificity and recovery, reducing non-specific binding and maintaining cellular integrity, thereby enhancing the purification of targeted biological materials.
Implementation Method 1
The hydrogel coating includes a binding moiety such as an antibody or antigen-binding fragment that specifically binds to target cells
Implementation Method 2
The hydrogel is gelled by crosslinking alginic acid molecules by a cation, e.g., Li+, Mg2+, Ca2+, Sr2+, Ba2+, Zn2+, Cu2+, or Al3+, preferably Ca2+
Implementation Method 3
contacting the hydrogel coating with a second liquid containing a release agent that releases the target from the shaped article, e.g., H+ or OH− (i.e., a pH change) or a chelating agent for a cation crosslinking the alginic acid
Data Source
AI summary
The invention features shaped articles containing a structure and a hydrogel coating thereon, the hydrogel coating containing alginic acid conjugated to a polyalkylene oxide and a binding moiety. The hydrogel coating on the structure is sized and shaped to fit in a well in a microtiter plate and the coating does not cover the entire exterior of the surface. The invention further features methods of capturing targets using shaped articles and methods of preparing shaped articles.