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Lipoic Acid Gold Nanoparticles Functionalized with Organic Compounds as Bioactive Materials
Ioana Turcu1, Irina Zarafu2, Marcela Popa3,4
1Department of Organic Chemistry, Biochemistry and Catalysis, University of Bucharest, 90-92 Panduri, 050663 Bucharest, Romania. oana_turcu@yahoo.com.
Nanomaterials (Basel, Switzerland)
|March 25, 2017
Summary
Functionalized gold nanoparticles show reduced antimicrobial activity but are biocompatible. These gold nanosystems demonstrate potential for developing new antimicrobial agents, despite possible inactivation during functionalization.
Area of Science:
- Nanotechnology
- Materials Science
- Biochemistry
Background:
- Gold nanoparticles (AuNPs) are widely explored for biomedical applications.
- Lipoic acid (LA) is a common capping agent for stabilizing AuNPs.
- Functionalization of AuNPs can enhance their therapeutic potential.
Purpose of the Study:
- To synthesize and characterize lipoic acid-protected gold nanoparticles functionalized with bioactive molecules.
- To evaluate the antimicrobial activity of these functionalized gold nanoparticles.
- To assess the biocompatibility and cellular effects of the synthesized nanosystems.
Main Methods:
- Synthesis of water-soluble gold nanoparticles stabilized by lipoic acid.
- Functionalization of AuNPs with 1-naphtylamine, 4-aminoantipyrine, and 4'-aminobenzo-15-crown-5 ether via coupling reactions.
- Characterization of lipoic acid derivatives and functionalized AuNPs.
- Antimicrobial activity assays.
- Mammalian cell viability and cell cycle assays.
Main Results:
- Functionalized gold nanoparticles exhibited decreased antimicrobial activity compared to their organic counterparts.
- This reduction in activity suggests potential inactivation of bioactive groups during the functionalization process.
- Both bare and functionalized gold nanoparticles demonstrated biocompatibility at concentrations below 50 µg/mL.
- Cellular viability and cell cycle assays confirmed the safety profile of the nanosystems.
Conclusions:
- Functionalized gold nanoparticles are biocompatible and show potential as novel antimicrobial agents.
- The functionalization strategy requires optimization to preserve the full antimicrobial efficacy of the attached molecules.
- Further research is warranted to develop these gold nanosystems for therapeutic applications.
