PEG Di-acrylate (Acrylate PEG Acrylate): Uses & FAQ

PEG Di-acrylate, Acrylate PEG Acrylate is a bifunctional polyethylene glycol derivative bearing terminal acrylate groups that enable rapid photo- or chemically initiated crosslinking to form well-defined, biocompatible hydrogel networks widely used in tissue engineering, drug delivery, and 3D cell culture research.

Chemical Class

Bifunctional PEG derivative with terminal acrylate groups

SKU

P164163

Crosslinking Mechanism

Radical polymerization initiated by UV/visible light (with photoinitiator) or chemical redox initiation

Primary Application

Hydrogel formation for tissue engineering, 3D cell encapsulation, and controlled drug release

Biocompatibility

Hydrogels formed from PEGDA are generally considered cytocompatible and protein-resistant

Supplier

Aladdin Scientific

What Is PEG Di-acrylate (PEGDA) and How Does It Work?

PEG Di-acrylate (PEGDA), also referred to as Acrylate PEG Acrylate, is a linear polyethylene glycol (PEG) chain end-functionalized with two acrylate groups. These reactive termini undergo free-radical polymerization when exposed to an appropriate initiating system, rapidly forming a three-dimensional crosslinked network—commonly known as a hydrogel.

The PEG backbone is hydrophilic, causing the resulting network to swell extensively in aqueous media while maintaining structural integrity. Crosslink density, and therefore gel stiffness and mesh size, can be tuned by varying the molecular weight of the PEG spacer or the precursor concentration in solution. Higher molecular weight PEGDA yields softer, more porous gels, while lower molecular weight or higher concentration produces stiffer, denser networks.

Crosslinking can be initiated photochemically using a UV or visible-light photoinitiator (e.g., Irgacure 2959 or lithium phenyl-2,4,6-trimethylbenzoylphosphinate, LAP) or chemically via redox initiation (e.g., ammonium persulfate / TEMED). Photo-crosslinking is particularly attractive for biofabrication because it allows rapid, spatiotemporally controlled gelation.

Key Applications of PEGDA Hydrogels in Research

Tissue Engineering and Regenerative Medicine: PEGDA hydrogels serve as synthetic extracellular matrix (ECM) mimics. Their mechanical properties and biochemical functionality can be tailored by blending with cell-adhesion peptides (e.g., RGD sequences) or growth factors, enabling cell attachment, proliferation, and differentiation within a defined 3D environment.

3D Cell Encapsulation: The cytocompatibility of PEGDA and its mild gelation conditions allow living cells to be homogeneously encapsulated during crosslinking. This is widely exploited for organoid culture, spheroid formation, and high-throughput drug screening assays.

Controlled Drug and Protein Delivery: Therapeutic molecules can be physically entrapped within the PEGDA network or covalently tethered via degradable linkers. Gel degradation rate and drug release kinetics are engineered by incorporating hydrolysable (e.g., PLA segments) or enzymatically cleavable sequences into the backbone.

Bioprinting and Stereolithography (SLA/DLP): PEGDA is a standard resin component in extrusion-based and light-based 3D bioprinting, enabling fabrication of complex, anatomically relevant constructs with high resolution.

Surface Modification: Thin PEGDA coatings applied to device surfaces reduce non-specific protein adsorption and cell adhesion, relevant for biosensor and implant applications.

Storage, Handling, and Safety Considerations

Storage: PEGDA should be stored in a cool, dry environment away from light and heat sources to prevent premature polymerization or hydrolysis of the acrylate ester bonds. Refrigeration (2–8 °C) under an inert atmosphere or with the container tightly sealed is recommended. Always check the product-specific Certificate of Analysis (CoA) supplied with SKU P164163 for confirmed storage conditions.

Handling: Acrylate compounds are potential skin and eye irritants and sensitizers. Work in a well-ventilated area or fume hood, and wear appropriate personal protective equipment (PPE) including nitrile gloves, safety goggles, and a lab coat. Avoid generating aerosols.

Stability: In solution, PEGDA may undergo slow hydrolysis of the acrylate ester linkages. Prepare hydrogel precursor solutions fresh where possible and keep on ice prior to crosslinking. Inhibitor (typically monomethyl ether hydroquinone, MEHQ) may be present in the as-received material to prevent spontaneous polymerization; confirm with the CoA.

Disposal: Dispose of PEGDA waste in accordance with local regulations for organic chemical waste. Fully crosslinked PEGDA hydrogels may be disposed of as solid chemical waste; consult your institution's environmental health and safety office.

Ordering and Product Specifications for SKU P164163

Aladdin Scientific supplies PEG Di-acrylate, Acrylate PEG Acrylate under SKU P164163. Researchers should refer to the current product page and CoA for precise specifications including molecular weight distribution, degree of acrylation, appearance, and purity grade, as these parameters can vary by lot.

To place an order, log in to your Aladdin Scientific account, search for P164163, select the required quantity, and proceed through the standard checkout. Bulk or custom quantities may be available—contact Aladdin Scientific customer service for quotations. Ensure you review the current Safety Data Sheet (SDS) before ordering to confirm compatibility with your facility's chemical management policies.

For institutional procurement, purchase orders (POs) are accepted. Promotional pricing, reward points, and coupon codes can be applied at checkout where applicable. For shipping requirements of this reagent, consult the product page or contact customer support to confirm temperature-controlled shipping options if needed.

Troubleshooting Common PEGDA Hydrogel Preparation Issues

Gel Does Not Form: Verify that the photoinitiator concentration and light dose are appropriate for the PEGDA concentration and molecular weight used. Ensure the light source wavelength matches the photoinitiator absorption maximum. Check that the PEGDA stock has not degraded through hydrolysis or premature polymerization.

Weak or Inhomogeneous Gel: Insufficient crosslinking may result from low PEGDA concentration, high molecular weight polymer (large mesh size), inadequate irradiation time, or oxygen inhibition of radical polymerization. Working under nitrogen or in an oxygen-reduced environment can improve crosslinking efficiency. Ensure thorough mixing of precursor components before gelation.

Poor Cell Viability After Encapsulation: Excess photoinitiator or prolonged UV exposure can generate cytotoxic reactive oxygen species. Optimize photoinitiator concentration (typically 0.05–0.1% w/v for Irgacure 2959) and minimize UV exposure time. Visible-light initiators such as LAP may reduce phototoxicity. Use sterile, endotoxin-tested reagents and maintain aseptic technique throughout.

Gel Dissolves or Swells Excessively: This may indicate incomplete crosslinking or degradation of ester linkages under prolonged aqueous incubation or alkaline conditions. Confirm crosslinking conditions and use buffered physiological pH solutions for culture or storage.

Frequently asked questions

What molecular weights of PEG Di-acrylate (SKU P164163) are available from Aladdin Scientific?

Please refer to the current product listing for SKU P164163 on the Aladdin Scientific website for available molecular weight options and pack sizes, as the product portfolio may be updated. Contact customer service for specific molecular weight requirements not listed online.

How do I prepare a PEGDA hydrogel precursor solution for cell encapsulation?

Dissolve PEGDA in sterile phosphate-buffered saline (PBS) or cell culture medium at the desired weight/volume percentage (commonly 5–20% w/v depending on target stiffness), add a cytocompatible photoinitiator such as LAP (typically 0.05–0.1% w/v), mix cells into the precursor solution, cast or bioprint the mixture, then expose to appropriate light to initiate crosslinking. All steps should be performed under aseptic conditions. Optimize concentrations empirically for your specific application.

Can PEGDA hydrogels be made biodegradable for in vivo applications?

Standard PEGDA hydrogels degrade slowly primarily through hydrolysis of the acrylate ester linkages and are generally considered non-biodegradable on timescales relevant to most in vivo studies. Biodegradability can be introduced by copolymerizing PEGDA with hydrolysable segments (e.g., poly(lactic acid) or poly(caprolactone) blocks) or by incorporating protease-sensitive peptide crosslinkers, yielding cell-responsive matrices. Consult current literature for validated formulations.

What initiator systems are compatible with PEGDA crosslinking?

PEGDA can be crosslinked using UV photoinitiators such as Irgacure 2959 (absorption ~315 nm), visible-light photoinitiators such as lithium phenyl-2,4,6-trimethylbenzoylphosphinate (LAP, absorption ~375 and ~405 nm), or chemical redox initiation using ammonium persulfate and TEMED. For cell-laden applications, visible-light initiators are preferred to minimize phototoxicity. Always validate initiator cytocompatibility before biological experiments.

How should I confirm the degree of acrylation of the PEGDA I receive?

The degree of acrylation can be assessed by proton NMR spectroscopy by comparing the integrals of the vinyl proton peaks (δ ~6.0–6.5 ppm) to the PEG backbone methylene protons (δ ~3.6 ppm). The Certificate of Analysis (CoA) for SKU P164163 should report purity and relevant characterization data; review it upon receipt and contact Aladdin Scientific if values do not meet specification.

References

1. Hern DL, Hubbell JA. Incorporation of adhesion peptides into nonadhesive hydrogels useful for tissue resurfacing. Journal of Biomedical Materials Research. 1998;39(2):266-276.
2. Nguyen KT, West JL. Photopolymerizable hydrogels for tissue engineering applications. Biomaterials. 2002;23(22):4307-4314.
3. Bryant SJ, Anseth KS. Hydrogel properties influence ECM production by chondrocytes photoencapsulated in poly(ethylene glycol) hydrogels. Journal of Biomedical Materials Research. 2002;59(1):63-72.
4. Fairbanks BD, Schwartz MP, Bowman CN, Anseth KS. Photoinitiated polymerization of PEG-diacrylate with lithium phenyl-2,4,6-trimethylbenzoylphosphinate: polymerization rate and cytocompatibility. Biomaterials. 2009;30(35):6702-6707.

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.