AlgMA is a photosensitive polymer material derived from the modification of sodium alginate (Alg) with methacrylic anhydride (MA). It can be used in conjunction with blue light or UV photoinitiators and undergoes crosslinking and curing under blue light or ultraviolet irradiation. This polymer features excellent biocompatibility and facile curing conditions. It possesses a unique ability to chelate multivalent cations and exhibits high viscosity. Currently, it has been widely applied in 2D/3D cell culture, bioprinting, drug delivery, tissue engineering scaffolds, cell microencapsulation for immunoisolation, and other fields.
Product Specifications
| Component | Appearance | Specification | Remarks | AlgMA
| White to pale yellow powder or granules
| 1 g/bottle, 5 g/bottle | Store in the dark
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Suggestions for Use
1. AlgMA can be used in combination with o-nitrobenzyl alcohol-modified polymers, such as PEGNB, HANB, and GelNB. Both can be polymerized and crosslinked by photoinitiators LAP or NAP under light irradiation, and high-strength hydrogel materials can be obtained within seconds.
2. AlgMA can be used in combination with methacryl-modified polymers (such as CMCMA, GelMA, CSMA, ChMA) and allyl-modified polymers (such as F127DA). Polymerization is initiated by photoinitiators under light irradiation to construct hydrogel materials with different physicochemical properties.
3. AlgMA can be used alone, polymerized and crosslinked by photoinitiators under light irradiation.
Preparation Method
1. Preparation of photoinitiator stock solution: Dissolve an appropriate amount of NAP or LAP to prepare a solution with a concentration in the range of 0.1 wt%-0.25 wt%. Store at 2-8 °C away from light.
2. Weigh the required amount of AlgMA into a centrifuge tube, then add the required volume of initiator stock solution into the tube.
3. Stir the sample in the dark at room temperature or shake on an orbital shaker until completely dissolved. If the sample clumps, crush it with a spatula first; if dissolution is slow, heat and stir at 50-60 °C to assist dissolution.
Precautions
1. The higher the concentration of the prepared AlgMA solution, the higher the modulus of the cured gel and the shorter the curing time.
2. The viscosity of the AlgMA solution is related to the viscosity of the raw material sodium alginate and the solution concentration. For low-viscosity AlgMA, the recommended concentration is ≤ 5 wt%; for medium-viscosity AlgMA, the recommended concentration is ≤ 2 wt%.
3. The higher the concentration of the photoinitiator stock solution, the faster the curing speed of the AlgMA solution.
Applications
3D bioprinting, tumor model construction, cell loading, wound dressings, drug controlled release, dental impressions, etc.
Sterilization Methods
1. Filter sterilization (recommended): Sterilize the solution using a 0.22 μm sterile syringe filter. This method is only suitable for low-viscosity solutions. For high-viscosity solutions, pasteurization or moist heat sterilization is recommended.
2. Pasteurization: Heat the solution to 80 °C and hold for 30 min, then quickly cool to room temperature in an ice-water mixture. Repeat the cycle three times.
3. Moist heat sterilization: Sterilize the solution in an autoclave at 121 °C for 8 min. After manual pressure release, quickly cool the solution to room temperature in an ice-water mixture. Note: High temperature may reduce hydrogel performance; strictly follow the above procedure when using this method.
Note: Sterile solutions can be stored temporarily at 2-8 °C away from light and are recommended to be used within 7 days; Non-sterile solutions can be stored temporarily at 2-8 °C away from light and are recommended to be used within 48 hours.
Features
Na⁺ in the G-units of sodium alginate can undergo ion exchange with multivalent metal cations (Zn²⁺, Fe³⁺, Ba²⁺, Cr³⁺, Ca²⁺, etc.) in aqueous solution, allowing multiple G-units to crosslink with multivalent cations to form an “egg-box” structure, producing metal-ion-containing sodium alginate-based hydrogels.Meanwhile, double bond functional groups on the polymer chains enable photocrosslinking in the presence of photoinitiators, forming a dual-crosslinked network hydrogel with improved mechanical properties.
Typical Applications
1. Preparation of elastic tissue adhesives
2. Preparation of bioprinting inks: Bioprinted cardiac models for drug screening, disease modeling, etc.
3. Wastewater treatment
4. Preparation of hydrogel microspheres as gastric-targeted drug carriers
Advantages
1. Batch-to-batch stability: Standardized production ensures high repeatability and consistency in composition, physicochemical properties, and biological performance among different batches of AlgMA.
2. Ultra-high purity: Unique production process effectively removes methacrylic acid monomers and process impurities, achieving ultra-low impurity levels and ensuring safety for biomedical applications.
3. Reliable safety: Each batch is released after strict standardized testing to guarantee safety in biomedical use.
4. High stability: In accordance with the Guidelines for Stability Study of Non-Invasive Implantable Medical Devices, real-time and accelerated stability tests confirm that AlgMA remains stable under labeled storage conditions.
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