Photoinitiators for Hydrogels
LAP, Irgacure & Advanced UV/Visible Light Initiators for Biomedical Applications
Precision Photocrosslinking
Photoinitiators enable rapid, spatially controlled polymerization of hydrogels for drug delivery, 3D bioprinting, and tissue engineering.
Our portfolio includes water-soluble, biocompatible initiators activated by UV (365 nm) or visible light (405 nm) ensuring high cell viability and structural fidelity in complex biomedical constructs.
Photoinitiator Portfolio
| Product | Wavelength | Solubility |
|---|---|---|
| LAP | 365, 405 nm | Water (4.7%) |
| Irgacure 2959 | 365 nm | Water (mod.) |
| Irgacure 651 | 365 nm | Organic |
| TPO | 365, 405 nm | Limited water |
| TPO-L | 365, 405 nm | Water (high) |
| Irgacure 819 | 365, 405 nm | Organic |
| Eosin Y | 514 nm | Water |
| Ruthenium | 450 nm | Water |
LAP - The Bio-Ink Gold Standard
Superior Biocompatibility
Lowest cytotoxicity; safe for cell encapsulation at 0.1-0.5 wt%.
High Water Solubility
Up to 4.7 wt% in water. Easy formulation with hydrophilic monomers.
Visible Light Activation
405 nm blue light. Less phototoxic than UV, penetrates deeper.
Fast Kinetics
Rapid gelation (seconds to minutes). Ideal for bioprinting.
LAP Recommended Usage
CONCENTRATION
0.1-0.5 wt% for cell-laden hydrogels
0.05-0.1 wt% for acellular systems
LIGHT SOURCE
405 nm LED (5-20 mW/cm²)
365 nm UV (1-10 mW/cm²)
COMPATIBLE MONOMERS
Photoinitiator Selection Guide
Choose the optimal initiator based on your specific application requirements.
| Application | Recommended Initiator | Concentration | Light Source | Rationale |
|---|---|---|---|---|
| 3D Bioprinting (cell-laden) | LAP | 0.1-0.3 wt% | 405 nm LED | Highest cell viability, fast gelation |
| Cell encapsulation | LAP or Irgacure 2959 | 0.05-0.1 wt% | 405 or 365 nm | Low toxicity, FDA-studied |
| Acellular hydrogels | TPO or Irgacure 651 | 0.1-0.5 wt% | 365 nm UV | High efficiency, cost-effective |
| Thick constructs (>5 mm) | Irgacure 819 or TPO | 0.2-0.5 wt% | 405 nm | Long-wavelength penetration |
| Visible light (green/blue) | Eosin Y + TEA | 0.01-0.1 mM | 514 nm | Deep tissue penetration |
| Drug delivery depots | LAP or Irgacure 2959 | 0.05-0.2 wt% | 365 or 405 nm | Biocompatible residues |
LAP vs Irgacure 2959
| Property | LAP | Irgacure 2959 |
|---|---|---|
| Wavelength | 365 nm & 405 nm | 365 nm (UV only) |
| Water Solubility | High (4.7 wt%) | Moderate (0.5-1 wt%) |
| Cytotoxicity | Very low | Low to moderate |
| Polymerization Rate | Faster (higher radical yield) | Moderate |
| Cell Viability (>90%) | 0.1-0.5 wt% | 0.05-0.1 wt% |
| Regulatory Status | Research/biomedical use | FDA-studied (extensive data) |
| Best For | Bioprinting, visible light | Standard UV, lower cost |
Formulation Guidelines
1. Dissolution
Dissolve initiator in PBS or monomer solution. LAP dissolves quickly; Irgacure 2959 may need heating (37-50°C).
2. Concentration
Start with 0.1 wt% for cell-laden systems. Optimize based on gelation time and cell viability.
3. Light Exposure
365 nm: 1-5 min at 5-10 mW/cm².
405 nm: 30 sec - 3 min at 10-20 mW/cm².
4. Oxygen Inhibition
Purge with N₂ or use higher photoinitiator concentration for thick constructs or low power and short exposure time cases.
5. Storage
Prepare fresh solutions. Store stock solutions at -20°C in dark, use within 1 month. Powder: follow specified storage conditions.
Technical Specifications Summary
| Parameter | LAP | Irgacure 2959 | TPO |
|---|---|---|---|
| Molecular Weight | ~338 g/mol | ~224 g/mol | ~348 g/mol |
| Appearance | Off-white powder | White crystalline | Yellow powder |
| Purity | >95% | >98% | >97% |
| Storage | -20°C | Room Temp | Room Temp |
| Endotoxin | <10 EU/g (Low-end grade) | <50 EU/g | N/A |
Why Choose Our Photoinitiators?
High-performance materials backed by full technical documentation.
High Purity
Full CoA & characterization
Low Endotoxin
LAP <10 EU/g grade
Flexible Packaging
100mg to kg quantities
Application Support
Technical guidance & tips
Ready to Innovate?
Contact our technical team for photoinitiator selection, custom concentrations, and application support.