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Polyisocyanopeptide Hydrogels Are Effectively Sterilized Using Supercritical Carbon Dioxide
Roel C Op 't Veld1,2, Mees Eerden3, Frank A D T G Wagener2
1Department of Dentistry-Biomaterials, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, The Netherlands.
Tissue Engineering. Part C, Methods
|December 19, 2019
Summary
Sterilizing delicate polyisocyanopeptide (PIC) hydrogels is challenging. Supercritical CO2 (scCO2) treatment is the only effective method, successfully eliminating bacteria without damaging the hydrogel properties.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Medical Device Sterilization
Background:
- Soft biomaterials like hydrogels require effective sterilization methods.
- Hydrogels composed of tri(ethylene glycol)-functionalized polyisocyanopeptides (PIC) are biomimetic materials with potential applications in cell culturing, wound dressings, and drug delivery.
- The delicate nature of these hydrogels makes them susceptible to damage from conventional sterilization techniques.
Purpose of the Study:
- To evaluate various sterilization methods for polyisocyanopeptide (PIC) hydrogels.
- To determine the impact of sterilization on the structural integrity and mechanical properties of PIC hydrogels.
- To identify a sterilization method that effectively eliminates bacteria without compromising hydrogel performance.
Main Methods:
- Investigated autoclaving, gamma irradiation, ultraviolet (UV) light irradiation, and supercritical CO2 (scCO2) treatment.
- Assessed the effects of each method on hydrogel gelation behavior and mechanical characteristics.
- Evaluated the antimicrobial efficacy of scCO2 treatment against Staphylococcus aureus.
Main Results:
- Autoclaving and gamma irradiation negatively impacted PIC hydrogel properties.
- UV light and scCO2 treatment preserved the mechanical properties of PIC hydrogels.
- Supercritical CO2 (scCO2) achieved a 6-log reduction in bacterial load, demonstrating effective sterilization.
Conclusions:
- Conventional sterilization methods like autoclaving and gamma irradiation are unsuitable for PIC hydrogels.
- Supercritical CO2 (scCO2) is a viable and effective sterilization method for PIC hydrogels.
- scCO2 treatment preserves the integrity of PIC hydrogels while ensuring sterility for biomedical applications.
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