Light-mediated Hydrogels
Light-mediated Hydrogels - Related Videos
10:45
Light-mediated Formation and Patterning of Hydrogels for Cell Culture Applications
0 Views •
Cited by 26 •
2016
We describe a sequential process for light-mediated formation and subsequent biochemical patterning of synthetic hydrogel matrices for three-dimensional cell culture applications. The construction and modification of hydrogels with cytocompatible photoclick chemistry is demonstrated. Additionally, facile techniques to quantify and observe patterns and determine cell viability within these hydrogels are presented.
15:06
Synthesis of an Intein-mediated Artificial Protein Hydrogel
0 Views •
Cited by 2 •
2014
We present the synthesis of a split-intein-mediated protein hydrogel. The building blocks of this hydrogel are two protein copolymers each containing a subunit of a trimeric protein that serves as a crosslinker and one half of a split intein. Mixing of the two protein copolymers triggers an intein trans-splicing reaction, yielding a polypeptide unit that self-assembles into a hydrogel. This hydrogel is highly pH- and temperature-stable, compatible with organic solvents, and easily incorporates...
03:07
Targeted Bacterial Colony Isolation Using Light-Patterned Hydrogel Degradation
0 Views •
2025
Source: Fattahi, N., et al. Photodegradable Hydrogel Interfaces for Bacteria Screening, Selection, and Isolation. J. Vis. Exp. (2021).This video demonstrates the extraction of bacterial colonies from a photodegradable hydrogel using UV light. A specific colony is selected, and a patterned light exposure is designed to initiate localized hydrogel degradation. After adjusting light intensity and duration, the UV light is applied, releasing the colony. The colony is then aspirated through tubing...
02:11
Curli Fiber-Mediated Stabilization of Bacterial Hydrogel Patterns
0 Views •
2026
Source: Spiesz, E. M., et al., Three-dimensional Patterning of Engineered Biofilms with a Do-it-yourself Bioprinter. J. Vis. Exp. (2019)This video demonstrates a method for comparing 3D-printed alginate patterns containing either control or genetically engineered bacterial strains. The test strain produces curli fibers upon induction, which reinforce the alginate hydrogel structure. Following treatment with a calcium-chelating solution, only the test pattern remains intact, highlighting the...
08:33
Hydrogel Synthesis
0 Views •
2023
Source: Amber N. Barron, Ashlea Patterson, and Taylor D. Sparks, Department of Materials Science and Engineering, The University of Utah, Salt Lake City, UT Hydrogels are a versatile class of cross-linked polymers produced through relatively simple procedures and with generally inexpensive materials. They can be formed from solution and involve a polymer backbone formed from monomer reagents, an initiator which makes the polymer reactive and a crosslinking species which binds the polymer chains...
FAQs
The photoinitiator is the light-responsive component that absorbs a selected wavelength and generates reactive species. These species initiate polymer crosslinking, converting the starting material into a connected network. Its presence links the applied light conditions to gelation, enabling researchers to control when the material forms rather than relying only on the surrounding environment.
Because gelation can be controlled by the timing and location of light exposure, researchers can influence where a network forms and how its structure is organized. This control supports adjustment of properties such as stiffness and porosity, which are important when designing hydrogels to reproduce selected physical features of native tissue.
Spatially controlled gelation allows material formation in selected regions instead of producing only a uniform bulk gel. This capability is useful for creating patterned constructs and for shaping three-dimensional environments around biological components. It also supports fabrication strategies that are minimally invasive, expanding how hydrogels can be integrated into bioengineering designs.
A typical workflow begins with a water-rich polymer formulation containing a photoinitiator. The formulation is positioned where the construct is needed, then exposed to an appropriate selected wavelength so the photoinitiator generates reactive species and triggers crosslinking. The resulting network can then be used with the intended cells, scaffold design, or delivery application.
These materials can encapsulate cells within a three-dimensional polymer network or serve as scaffolds for tissue engineering. Their adjustable stiffness, porosity, and biochemical composition help researchers create environments that reproduce selected aspects of native tissue. They also support advanced three-dimensional cell culture, where cells remain surrounded by a structured, water-rich material.
Researchers use light-mediated hydrogels to fabricate patterned constructs and to regulate the release of biomolecules or drugs. Changes in network structure, porosity, stiffness, and biochemical composition provide ways to tailor the material for a particular application. In bioengineering, the same light-controlled platform can therefore support both spatial design and controlled biological delivery.