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[Home](https://www.sigmaaldrich.com/PL/en)[Tissue Engineering](https://www.sigmaaldrich.com/PL/en/applications/materials-science-and-engineering/tissue-engineering)Exploring Hydrogels: Key Materials for Biomedical Applications
# Exploring Hydrogels: Key Materials for Biomedical Applications
__Section Overview__
- [Introduction](https://www.sigmaaldrich.com#introduction)
- [Key Material Types](https://www.sigmaaldrich.com#types)
- [Crosslinking Methods](https://www.sigmaaldrich.com#methods)
- [Key Applications](https://www.sigmaaldrich.com#applications)
- [Recent Advances](https://www.sigmaaldrich.com#advances)
- [Additives for Hydrogel](https://www.sigmaaldrich.com#additives)
- [Related Products](https://www.sigmaaldrich.com#see-products)
## [](https://www.sigmaaldrich.com)Introduction
Hydrogels are three-dimensional networks of hydrophilic polymers with the ability to retain a large amount of water, closely mimicking the properties of natural tissue. A key property of these materials is their biocompatibility, which ensures minimal adverse reactions when in contact with biological tissues1. These distinctive properties render them highly useful in biomedical applications. Hydrogels can be derived from natural sources like collagen and alginate or can be chemically produced from polymers such as PEG and PVA. The natural versatility in composition and structure permits the customization of mechanical strength, biodegradability, and bioactivity to meet the requirements for targeted applications.
## [](https://www.sigmaaldrich.com)Key Material Types
Based on the source, hydrogels can be broadly classified into natural and synthetic categories. Each type has unique properties, advantages, and applications in biomedical fields. Comparative properties of natural and synthetic hydrogel polymers are summarized in __Table 1__.
| | | |
|---------------------|--------------------------------------------------------------|-------------------------------------------------------|
| Property | Natural Polymers | Synthetic Polymers |
| Source | Derived from biological materials (e.g., collagen, alginate) | Chemically synthesized (e.g., PEG, PVA) |
| Biocompatibility | Generally high, mimicking natural tissues | Varies; can be engineered for specific applications |
| Customization | Limited to natural variability | Highly customizable in terms of properties |
| Mechanical Strength | Typically, lower mechanical strength | Can be designed for high strength and durability |
| Biodegradability | Often biodegradable | Varies; some are designed for controlled degradation |
| Cost | Can be more expensive due to extraction | Generally, more cost-effective due to mass production |
Table 1.Comparative properties of natural and synthetic polymers
### Natural Polymers
Natural polymers such as collagen, gelatin, and alginate are favored for biomedical applications due to their excellent biocompatibility and biodegradability. Collagen supports cell growth and is widely used in tissue engineering; gelatin offers easy modification and gelation properties for drug delivery; and alginate forms biocompatible hydrogels ideal for cell encapsulation and wound healing.
### Synthetic Polymers
Polyethylene glycol (PEG) is renowned for its biocompatibility and hydrophilicity and is widely used in drug delivery and tissue engineering hydrogels. Polyvinyl alcohol (PVA) offers excellent mechanical strength, biocompatibility, and moisture retention, making it ideal for wound dressings and scaffolds. Polyacrylic acid (PAA) is valued for its water absorption and pH-responsive gelation, suited for controlled drug release and tissue regeneration.
## [](https://www.sigmaaldrich.com)Crosslinking Methods
Hydrogels can be crosslinked using physical methods (e.g., hydrogen bonding) or chemical methods (e.g., covalent bonds), depending on the desired application. These advances enhance the applicability of hydrogels through improved interaction with biological systems, making them more effective in therapeutic and regenerative medicine. Representative hydrogel recipes with monomers, cross-linkers, initiators, and key biomedical applications are presented in __Table 2__.
Hydrogels (Name & Type)
Monomers/Polymers
Crosslinking Agents & Method
Initiators
Applications
pHEMA (Synthetic)
[2-Hydroxyethyl methacrylate (HEMA)](https://www.sigmaaldrich.com/IN/en/substance/2hydroxyethylmethacrylate13014868779)
[Ethylene glycol dimethacrylate](https://www.sigmaaldrich.com/PL/en/product/aldrich/335681) [(EGDMA)](https://www.sigmaaldrich.com/PL/en/product/aldrich/335681)
UV/thermal crosslinking
[Azobisisobutyronitrile (AIBN)](https://www.sigmaaldrich.com/PL/en/product/aldrich/768375)
Contact lenses; ocular drug delivery
Silicone-based Hydrogel (Hybrid)
[3-\[Tris(trimethylsiloxy)silyl\]propyl methacrylate (TRIS)](https://www.sigmaaldrich.com/PL/en/product/aldrich/446130), [*N,N*-Dimethylacrylamide,](https://www.sigmaaldrich.com/PL/en/product/aldrich/274135) [1-Vinyl-2-pyrrolidinone](https://www.sigmaaldrich.com/PL/en/product/aldrich/v3409)
[Poly(ethylene glycol) dimethacrylate (PEGDMA)](https://www.sigmaaldrich.com/PL/en/substance/polyethyleneglycoldimethacrylate1234525852475)
UV curing
Photoinitiator like, [Diphenyl(2,4,6- trimethylbenzoyl) phosphine oxide (TPO)](https://www.sigmaaldrich.com/PL/en/product/aldrich/415952) or [Phenylbis(2,4,6- trimethylbenzoyl)phosphine oxide](https://www.sigmaaldrich.com/PL/en/product/aldrich/511447)
High-oxygen-permeable contact lenses
PEG Hydrogel (Synthetic)
[Poly(ethylene glycol) diacrylate](https://www.sigmaaldrich.com/US/en/substance/polyethyleneglycoldiacrylate1234526570489) [PEGDA](https://www.sigmaaldrich.com/US/en/substance/polyethyleneglycoldiacrylate1234526570489) / [tetra-PEG](https://www.sigmaaldrich.com/PL/en/substance/polyethyleneglycol1234525322683)
Self-crosslink via thiol-Michael or UV
UV photoinitiators like, [2-Hydroxy-4′- (2-hydroxyethoxy)-2- methylpropiophenone](https://www.sigmaaldrich.com/PL/en/product/aldrich/410896), [Lithium phenyl-2,4,6- trimethylbenzoyl phosphinate (LAP)](https://www.sigmaaldrich.com/PL/en/product/aldrich/900889)
Surgical sealants; anti-adhesion
PVA Hydrogel (Synthetic)
[Poly(vinyl alcohol)](https://www.sigmaaldrich.com/PL/en/substance/polyvinylalcohol123459002895)
Freeze–thaw or glutaraldehyde crosslinking
None (physical) / acid-catalyzed (chemical)
Wound dressings; cartilage replacement
Alginate Hydrogel (Natural)
[Sodium alginate](https://www.sigmaaldrich.com/PL/en/substance/sodiumalginate123459005383)
Ionic gelation with Ca²⁺
Not required
Wound dressings; cell encapsulation
Hyaluronic Acid Hydrogel (Natural)
[Hyaluronic acid](https://www.sigmaaldrich.com/PL/en/product/aldrich/935166)
Carbodiimide/UV crosslinking
Photoinitiator like [Lithium phenyl-2,4,6-trimethylbenzoyl phosphinate (LAP)](https://www.sigmaaldrich.com/PL/en/product/aldrich/900889)
Dermal fillers; wound healing,
microneedles
Collagen/Gelatin Hydrogel (Natural)
[Type I collagen](https://www.sigmaaldrich.com/PL/en/product/aldrich/804614)/[gelatin](https://www.sigmaaldrich.com/PL/en/product/aldrich/924504)
Self-assembly or [*N*-(3-Dimethylaminopropyl)-*N′*-ethylcarbodiimide](https://www.sigmaaldrich.com/PL/en/product/aldrich/39391) / [*N*-hydroxysuccinimide (NHS)](https://www.sigmaaldrich.com/PL/en/substance/nhydroxysuccinimide115096066826) crosslinking
Carbodiimide activation
Wound matrices; tissue scaffolds
Chitosan Hydrogel (Natural)
[Chitosan](https://www.sigmaaldrich.com/PL/en/substance/chitosan123459012764)
[Genipin](https://www.sigmaaldrich.com/PL/en/substance/genipin226236902778) (covalent) or [Sodium tripolyphosphate (TPP)](https://www.sigmaaldrich.com/PL/en/product/sigald/238503) (ionic)
None (ionic); genipin reaction
Antimicrobial dressings; derma care
PVP Hydrogel (Synthetic)
[Polyvinylpyrrolidone](https://www.sigmaaldrich.com/PL/en/substance/polyvinylpyrrolidone123459003398)
[*N,N′*-Methylenebisacrylamide (MBAA)](https://www.sigmaaldrich.com/PL/en/substance/nnmethylenebisacrylamide15417110269) (UV crosslink) or grafting
[2-Hydroxy-4′-(2- hydroxyethoxy)-2- methylpropiophenone](https://www.sigmaaldrich.com/PL/en/product/aldrich/410896) / [Benzophenone](https://www.sigmaaldrich.com/PL/en/product/aldrich/427551)
Lubricious coatings; personal care
PNIPAM Hydrogel (Smart, Synthetic)
[*N*-Isopropylacrylamide (NIPAM)](https://www.sigmaaldrich.com/PL/en/substance/nisopropylacrylamide113162210255)
[*N,N’*-Methylenebisacrylamide (BIS)](https://www.sigmaaldrich.com/PL/en/substance/nnmethylenebisacrylamide15417110269)
free-radical polymerization
[Ammonium persulfate (APS)](https://www.sigmaaldrich.com/US/en/search/ammonium-persulfate?focus=products&page=1&perpage=30&sort=relevance&term=Ammonium%20Persulfate&type=product) + [*N,N,N′,N′*-Tetramethylethylenediamine (TEMED)](https://www.sigmaaldrich.com/PL/en/substance/nnnntetramethylethylenediamine11620110189)
Thermoresponsive systems, smart polymers
Table 2.Hydrogel Formulations: Composition, Crosslinking, and Uses
## [](https://www.sigmaaldrich.com)Key Applications
Hydrogels offer versatile solutions across the biomedical field due to their unique ability to retain water and adapt to biological environments. They enable developments in wound healing, medical devices, and tissue engineering by supporting advanced therapies, drug delivery, and 3D cell culture solutions.
### Medical Devices
#### Wound Healing
Hydrogels support wound healing by maintaining moisture, promoting cell growth, and delivering antimicrobial agents. Integrating smart polymers allow continuous health monitoring, enabling real-time tracking of metrics like pH, glucose, or infection status for better care2.
### Contact Lenses and Dental Applications
Hydrogels are used in contact lenses for their oxygen permeability, softness, and ability to retain moisture—enhancing comfort during wear. In dentistry, the durability of hydrogels supports sustained drug release, stable tissue regeneration support, and periodontal repair with structural integrity and therapeutic function retained over long-term clinical use. Their biocompatibility and versatility make them valuable in both optical and oral care fields3.
### Tissue Engineering
Hydrogels provide a scaffold that supports cell attachment, growth, and differentiation, crucial for tissue regeneration. They mimic the extracellular matrix (ECM) structure, allowing for the integration of cells and growth factors to form new tissues. Applications include cartilage repair, bone regeneration, and vascular tissue engineering.
### 3D Bioprinting
Hydrogels play a crucial role in 3D bioprinting as bioinks due to their high water content, biocompatibility, and customizable properties. They support cell encapsulation, maintain viability, and mimic the extracellular matrix. This facilitates the precise construction of tissues and organs, aiding regenerative medicine and personalized therapeutic solutions4.
### Controlled Release Mechanisms
Hydrogels can encapsulate drugs and release them in a controlled manner, improving therapeutic efficacy and reducing side effects. They are particularly useful for localized delivery, where the drug is released at the target site over an extended period5. By regulating the drug's half-life, hydrogels enable sustained delivery for applications like cancer therapy or chronic wound management, improving therapeutic efficacy and patient compliance.
### Personal Care – Cosmetic Industry
Hydrogels play a pivotal role in personal care due to their hydration, biocompatibility, and tunable properties. With respect to formulations, they stabilize and control the release of active ingredients in creams and serums. Dermal fillers, which are primarily hyaluronic acid-based hydrogels, provide volume restoration, elasticity, and long-lasting effects. A key factor behind their durability is 1,4-butanediol diglycidyl ether (BDDE), the gold-standard crosslinking agent.6 BDDE covalently links HA chains, strengthening the hydrogel structure, improving elasticity, and reducing enzymatic breakdown. This translates to longer-lasting fillers, fewer retreatments, and enhanced patient satisfaction. Beyond fillers, BDDE-crosslinked hydrogels are enabling next-generation cosmetic solutions. They provide a stable matrix for smart, responsive systems that deliver antioxidants, peptides, or UV filters precisely when needed, supporting skin health and rejuvenation. In high-end plastic surgery, injectable hydrogels support tissue regeneration and contouring with minimal invasiveness. Advanced personal care solutions utilize smart hydrogels, which are responsive to pH, temperature, or enzymes, enabling targeted delivery of antioxidants, peptides, or UV filters for enhanced skin health and rejuvenation.
## [](https://www.sigmaaldrich.com)Recent Advances
Recent innovations in hydrogel technology focus on enhancing their functional properties and are summarized in __Table 3__.
Types of Hydrogels
Monomers/Polymers Used
Crosslinking Agents
Key Applications
Self-Healing Hydrogels
[Chitosan](https://www.sigmaaldrich.com/PL/en/substance/chitosan123459012764), [Tannic acid](https://www.sigmaaldrich.com/PL/en/product/sial/403040), [Polyethylene glycol](https://www.sigmaaldrich.com/PL/en/product/mm/821037), [4-(Diethoxymethyl)benzaldehyde,](https://www.sigmaaldrich.com/PL/en/product/aldrich/274860) [4-Aminophenylboronic acid hydrochloride](https://www.sigmaaldrich.com/PL/en/product/aldrich/708887)[,](https://www.sigmaaldrich.com/PL/en/product/aldrich/708887) [Poly(vinyl alcohol)](https://www.sigmaaldrich.com/PL/en/substance/polyvinylalcohol123459002895)
Hydrogen bonding, Ionic interactions, Imine bonds (benzaldehyde–amine) + Borate ester bonds (boronic acid–diol)
Wound dressings, tissue scaffolds7
Stimuli-Responsive Hydrogels
TOChN@PNIPAm - TEMPO oxidized nanochitin (TOChN) and [Poly(*N*-isopropylacrylamide)](https://www.sigmaaldrich.com/PL/en/product/aldrich/535311)
[Poly(*N*-isopropylacrylamide) (PNIPAm)](https://www.sigmaaldrich.com/PL/en/product/aldrich/535311), [2-(Dimethylamino)ethyl methacrylate (DMAEMA)](https://www.sigmaaldrich.com/PL/en/substance/2dimethylaminoethylmethacrylate157212867472), [PEDOT:PSS](https://www.sigmaaldrich.com/PL/en/product/aldrich/483095), Carboxymethyl cellulose, polythiophene, Acid-hydrolyzed cellulose
Dynamic boric acid ester bonds, hydrogen bonds, π–π stacking between DA groups and PEDOT:PSS, Covalent crosslinking, Electrostatic interactions
Tissue engineering, biosensors, Polymeric wearable sensors8
Clay–Polymer Hybrid Hydrogels
[Sodium alginate](https://www.sigmaaldrich.com/PL/en/substance/sodiumalginate123459005383), [Ethylene glycol](https://www.sigmaaldrich.com/PL/en/product/usp/1265515)[,](https://www.sigmaaldrich.com/IN/en/PL/en/product/usp/1265515) [Acrylic acid](https://www.sigmaaldrich.com/PL/en/product/mm/800181), [Silver nitrate](https://www.sigmaaldrich.com/PL/en/product/sigald/209139)
Chemical or physical crosslinking
Enhanced mechanical strength for wound healing, tissue engineering9
ULAS Hydrogels
Chemical crosslinking via free radical copolymerization process
Biosensing, ECG monitoring, wearable biomedical devices10
Injectable Hydrogels
[GelMA](https://www.sigmaaldrich.com/PL/en/product/aldrich/938408), [Methacrylated Alginate](https://www.sigmaaldrich.com/PL/en/product/aldrich/924482)
Radical photopolymerization
Designed for minimally invasive delivery, forming in situ to fill irregular defects and deliver cells or drugs11
Table 3.Cutting-Edge Hydrogel Materials: Composition, Crosslinkers, and Their Biomedical Applications
## [](https://www.sigmaaldrich.com)Additives for Hydrogel
Additives are widely employed in hydrogel systems to enhance their performance and expand the functionality of hydrogel-based contact lenses. For instance, incorporating photo-absorbers like [2-(4-Benzoyl-3-hydroxyphenoxy)ethyl acrylate](https://www.sigmaaldrich.com/US/en/product/aldrich/413216) into the hydrogel matrix can regulate light penetration during photopolymerization. This not only improves crosslinking control, spatial resolution, and mechanical robustness of the hydrogel but also enables the integration of UV and blue light filtering capabilities. Such enhancements are particularly valuable for protecting the eyes from harmful radiation, reducing digital eye strain, and improving overall comfort and safety for users in both medical and personal care applications.
__Disclaimer__: We offer a wide range of materials for medical device R&D, with a defined process to assist customers during scale-up and manufacturing, ensuring they use the appropriate quality level. The M-Clarity program helps customers select the right product. Visit [SigmaAldrich.com/m-clarity](https://www.sigmaaldrich.com/US/en/life-science/quality-and-regulatory-management/m-clarity-program?utm_source=redirect&utm_medium=promotional&utm_campaign=m-clarity) for more information.
[Click here](https://www.sigmaaldrich.com/US/en/products/materials-science/biomedical-materials) to learn more about our full offer for Med Device R&D.
[View PDF](https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/320/143/exploring-hydrogels-key-materials-for-biomedical-applications-an-67357en-ms.pdf)
## [](https://www.sigmaaldrich.com)Related Products
## Monomers
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### References
1\.
Zöller K, To D, Bernkop-Schnürch A. 2025. Biomedical applications of functional hydrogels: Innovative developments, relevant clinical trials and advanced products. Biomaterials. 312122718. [https://doi.org/10.1016/j.biomaterials.2024.122718](https://doi.org/10.1016/j.biomaterials.2024.122718)
2\.
Gounden V, Singh M. 2024. Hydrogels and Wound Healing: Current and Future Prospects. Gels. 10(1):43. [https://doi.org/10.3390/gels10010043](https://doi.org/10.3390/gels10010043)
3\.
Ishihara K, Shi X, Fukazawa K, Yamaoka T, Yao G, Wu JY. 2023. Biomimetic-Engineered Silicone Hydrogel Contact Lens Materials. ACS Appl. Bio Mater. 6(9):3600-3616. [https://doi.org/10.1021/acsabm.3c00296](https://doi.org/10.1021/acsabm.3c00296)
4\.
Mallakpour S, Tukhani M, Hussain CM. 2021. Recent advancements in 3D bioprinting technology of carboxymethyl cellulose-based hydrogels: Utilization in tissue engineering. Advances in Colloid and Interface Science. 292102415. [https://doi.org/10.1016/j.cis.2021.102415](https://doi.org/10.1016/j.cis.2021.102415)
5\.
Lin X, Zhang X, Wang Y, Chen W, Zhu Z, Wang S. 2025. Hydrogels and hydrogel-based drug delivery systems for promoting refractory wound healing: Applications and prospects. International Journal of Biological Macromolecules. 285138098. [https://doi.org/10.1016/j.ijbiomac.2024.138098](https://doi.org/10.1016/j.ijbiomac.2024.138098)
6\.
Wang Q, Yan H, Zhang J, Tian X, Xiao J. 2024. Engineering a durable BDDE cross-linked collagen filler for skin rejuvenation. Biomed. Mater. 19(5):055021. [https://doi.org/10.1088/1748-605x/ad6548](https://doi.org/10.1088/1748-605x/ad6548)
7\.
Yin H, Liu F, Abdiryim T, Liu X. 2023. Self-Healing Hydrogels: From Synthesis to Multiple Applications. ACS Materials Lett. 5(7):1787-1830. [https://doi.org/10.1021/acsmaterialslett.3c00320](https://doi.org/10.1021/acsmaterialslett.3c00320)
8\.
Neumann M, di Marco G, Iudin D, Viola M, van Nostrum CF, van Ravensteijn BGP, Vermonden T. 2023. Stimuli-Responsive Hydrogels: The Dynamic Smart Biomaterials of Tomorrow. Macromolecules. 56(21):8377-8392. [https://doi.org/10.1021/acs.macromol.3c00967](https://doi.org/10.1021/acs.macromol.3c00967)
9\.
Ruiz-Fresneda MA, González-Morales E, Gila-Vilchez C, Leon-Cecilla A, Merroun ML, Medina-Castillo AL, Lopez-Lopez MT. 2024. Clay–polymer hybrid hydrogels in the vanguard of technological innovations for bioremediation, metal biorecovery, and diverse applications. Mater. Horiz. 11(22):5533-5549. [https://doi.org/10.1039/d4mh00975d](https://doi.org/10.1039/d4mh00975d)
10\.
Ji R, Yan S, Zhu Z, Wang Y, He D, Wang K, Zhou D, Jia Q, Wang X, Zhang B, et al. 2024. Ureido‐Ionic Liquid Mediated Conductive Hydrogel: Superior Integrated Properties for Advanced Biosensing Applications. Advanced Science. 11(33): [https://doi.org/10.1002/advs.202401869](https://doi.org/10.1002/advs.202401869)
11\.
Bertsch P, Diba M, Mooney DJ, Leeuwenburgh SCG. 2023. Self-Healing Injectable Hydrogels for Tissue Regeneration. Chem. Rev.. 123(2):834-873. [https://doi.org/10.1021/acs.chemrev.2c00179](https://doi.org/10.1021/acs.chemrev.2c00179)
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