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Published on: February 19, 2016
Functionalized Halloysite Nanotubes as Potential Drug Carriers
Ewa Stodolak-Zych1, Alicja Rapacz-Kmita1, Marcin Gajek1
1Faculty of Materials Science and Ceramics, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Krakow, Poland.
Modified halloysite nanotubes effectively carry and release gentamicin, showing significant antibacterial activity against Escherichia coli. Surface modifications impact drug loading and release, with some treatments providing intrinsic antimicrobial properties.
Area of Science:
- Materials Science
- Nanotechnology
- Biomedical Engineering
Background:
- Halloysite nanotubes (HNTs) are explored as drug delivery systems.
- Gentamicin is a crucial antibiotic for treating bacterial infections.
- Optimizing HNTs for enhanced gentamicin delivery and efficacy is essential.
Purpose of the Study:
- To investigate modified halloysite nanotubes as gentamicin carriers.
- To evaluate the impact of HNT modification on drug loading, release kinetics, and biocidal properties.
- To assess the antibacterial activity of gentamicin-loaded HNTs against Escherichia coli.
Main Methods:
- Halloysite nanotube modification using sodium hydroxide, acids, curcumin, and delamination.
- Gentamicin intercalation into unmodified and modified HNTs.
- Characterization using FTIR, XRD, DSC/TG, and TEM.
- Antibacterial activity testing against Escherichia coli.
- Drug release kinetics studies.
Main Results:
- All gentamicin-intercalated HNTs exhibited high antibacterial activity.
- Sodium hydroxide modification yielded the highest antibacterial activity.
- Surface modification significantly influenced gentamicin loading and release, but not long-term release rate.
- Ammonium persulfate modification resulted in the highest drug release (over 11% loading efficiency).
- Intrinsic antibacterial activity was observed for HNTs modified with phosphoric acid and ammonium persulfate.
Conclusions:
- Surface modification of halloysite nanotubes is crucial for optimizing gentamicin delivery.
- Modified HNTs offer a promising platform for developing effective antibacterial agents.
- Specific modifications can impart intrinsic antimicrobial properties to the carrier material itself.
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