Photocleavable Nitroindoline Crosslinkers for Precision Hydrogel Patterning
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Solution Overview
Problem
Introducing three-dimensional structural elements into collagen-based hydrogels with defined pores at specific locations remains an unmet challenge, as existing methods lack precision and control in creating such structures.
Innovation Solution
Development of collagen-like peptides with photoreactive moieties that can be photolytically decomposed at precise locations using near ultraviolet or infrared light, allowing for site-specific manipulation and cross-linking to create stable hydrogel structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If collagen-based hydrogels are prepared by self-assembly in aqueous buffers, then soft hydrogels forming porous mesh microstructure are obtained, but the ability to introduce three-dimensional structural elements with defined pores at specific locations is lost
Solution Approach 1:
The collagen-like peptide is segmented into multiple domains including photoreactive moieties (nitroindoline groups) that can be independently activated by light. This segmentation allows specific regions of the hydrogel to be modified without affecting the overall structure, enabling precise introduction of three-dimensional elements at desired locations while maintaining the porous mesh microstructure formed by self-assembly.
Solution Approach 2:
The patent incorporates photoreactive nitroindoline moieties at specific positions within the collagen-like peptide sequence, creating local photoreactive zones. When illuminated, these localized moieties undergo photochemical reactions to form crosslinks or structural changes only at the irradiated sites, allowing precise spatial control over three-dimensional structure formation while the rest of the hydrogel maintains its native porous mesh architecture.
2Manufacturing precision
If photoreactive moieties are incorporated into collagen-like peptides, then site-specific photolytic decomposition is enabled, but the complexity of peptide synthesis and characterization increases
Solution Approach 1:
The patent utilizes the photochemical properties of nitroindoline moieties, which undergo wavelength-specific photoreactions. By selecting appropriate illumination wavelengths, precise spatial and temporal control over peptide decomposition is achieved. The photoreactive groups are strategically positioned in the peptide sequence to enable controlled release of specific segments, allowing complex site-specific modifications without requiring equally complex synthesis and characterization protocols.
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
Enables the creation of hydrogels with controlled three-dimensional structures and mechanical stability, facilitating tissue engineering applications by allowing for precise modification of the macroscopic material at the microscopic level.
Implementation Method 1
capable of photolytic cleavage with near ultraviolet light via a one-photon absorption process, or with infrared light via a multi-photon absorption process
Implementation Method 2
capable of photolytic cleavage with near ultraviolet light via a one-photon absorption process
Implementation Method 3
capable of photolytic cleavage with near ultraviolet light via a one-photon absorption process, or with infrared light via a multi-photon absorption process
Implementation Method 4
The peptides can also be cross-linked, either naturally via disulfide bonds, or with commercially available cross-linkers, or with photoreactive N-acyl-7-nitroindoline-containing cross-linkers, lending mechanical stability to the hydrogel
Data Source
AI summary
Crosslinkers of an amide or thiocarbamate of 7-nitroindoline were prepared with at least two attached reactive groups for crosslinking capability. The photo-cleavability of the invented crosslinkers is based on the known photolysis behavior of N-acyl-7-nitroindolines, and the photolysis behavior of amides and thiocarbamates of 7-nitroindolines. These crosslinkers enable crosslinking of biopolymers, which can be reversed by illumination with light.