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Efficient Antibacterial Agent Delivery by Mesoporous Silica Aerogel
Hui Xie1,2, Zhiguo He3,4, Yanxing Liu1
1Institute of Low-Dimensional Materials Genome Initiative, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.
ACS Omega
|March 14, 2022
Summary
Mesoporous silica aerogels effectively deliver antibacterial agents, forming nanocrystals that enhance bioavailability and provide sustained bacterial inhibition. These biocompatible carriers show significant potential for treating infections.
Area of Science:
- Materials Science
- Nanotechnology
- Biomedical Engineering
Background:
- Bacterial infections pose significant global health challenges.
- Silica aerogels offer unique porous structures for drug delivery but are underexplored for antibacterial agents.
- Improving the bioavailability of poorly soluble antibacterial agents is crucial for effective treatment.
Purpose of the Study:
- To investigate mesoporous silica aerogels as carriers for delivering three slightly soluble antibacterial agents: cinnamaldehyde, salicylic acid, and sorbic acid.
- To evaluate the loading efficiency and in vitro antibacterial efficacy of these agent-loaded aerogels.
- To assess the biocompatibility of the developed drug delivery system.
Main Methods:
- Utilized supercritical fluid carbon dioxide for loading antibacterial agents into mesoporous silica aerogels.
- Characterized the formation of uniform nanocrystals of antibacterial agents within the aerogel mesopores.
- Quantified loading efficiency and measured antibacterial inhibition rates against Escherichia coli.
- Performed in vitro biocompatibility assays.
Main Results:
- Achieved a high loading efficiency of 56 wt % for the antibacterial agents.
- Observed uniform nanocrystal formation of cinnamaldehyde, salicylic acid, and sorbic acid within silica aerogel mesopores.
- Demonstrated a 99.99% inhibition rate against Escherichia coli during initial release.
- Showcased sustained antibacterial activity with a 95% inhibition rate even after significant drug release.
Conclusions:
- Mesoporous silica aerogels are effective carriers for slightly soluble antibacterial agents, enhancing their bioavailability through nanocrystallization.
- The developed agent-loaded aerogels exhibit potent and sustained antibacterial efficacy against Escherichia coli.
- These silica aerogel-based systems demonstrate good in vitro biocompatibility, presenting a promising platform for antibacterial agent delivery.
