Features | Partner Sites | Information | LinkXpress
Sign In
Rigel Medical
Primedic
Schiller

Gold Nanoparticles Prevent Infection on Orthopedic Implants

By HospiMedica International staff writers
Posted on 23 Jul 2014
Gold (Au) nanoparticles help prevent the formation of antibiotic resistant biofilm on the surface of orthopedic implants, according to a new study.

Researchers at the Shanghai Institute of Ceramics (CIS; China) extrapolated that since gold nanoparticles can pass electrons to titanium dioxide (TiO2), they could be used to induce bacterial death. Due to a phenomenon known as localized surface plasmon resonance (a collective oscillations of electrons), an Au@TiO2 system could effectively kill bacteria in darkness by affecting respiratory electrons of the bacterial membrane, making them steadily lose electrons by transferring them first to the Au nanoparticles and then to TiO2, until they die.

To do so, they prepared close-packed TiO2 nanotube arrays on a metallic Ti surface by electro-chemical anodization. Then, using magnetron sputtering, they deposited Au nanoparticles to coat the Ti surfaces. The researchers then allowed Staphylococcus aureus and Escherichia coli to grow separately on the arrays. They found that both organisms were highly unsuccessful, exhibiting profuse membrane damage and cell leakage. The study describing the technology was published on June 30, 2014, in the journal Applied Physics Letters.

“Implant-associated infections have become a stubborn issue that often causes surgery failure. Designing implants that can kill bacteria while supporting bone growth is an efficient way to enhance in vivo osteointegration,” concluded senior author Prof. Xuanyong Liu, PhD. “This work provides insights for the better understanding and designing of noble metal nanoparticles-based plasmonic heterostructures for antibacterial application.”

TiO2 is able to kill bacteria itself due to its properties as a photocatalyst; when the metal is exposed to light, it becomes energetically excited by absorbing photons. This generates electron-hole pairs, turning Ti into a potent electron acceptor that can destabilize cellular membrane processes by usurping their electron transport chain's terminal acceptor. The dark conditions inside the human body, however, limit the bacteria-killing efficacy of TiO2. Gold nanoparticles, though, can continue to act as antibacterial terminal electron acceptors under darkness, due to localized surface plasmon resonance at the interface between conductors and dielectrics, such as between gold and TiO2.

Related Links:

Shanghai Institute of Ceramics




Channels

Critical Care

view channel
Image: Prototype of the UC3M device (Photo courtesy Universidad Carlos III de Madrid).

Innovative Device Provides for Faster Skin Biopsies

A new tool for performing skin biopsies requires neither local anesthesia nor specialized personnel, resulting in faster diagnosis of pathologies. Developed by researchers at Universidad Carlos III... Read more

Women's Health

view channel

Ovary Removal Cuts Breast Cancer Mortality Risk

Women with BRCA-positive breast cancer had a significantly lower risk of dying after prophylactic bilateral oophorectomy, according to a new study. Researchers at McGill University (Montreal, Canada), the Women’s College Research Institute (WCRI; Toronto, ON, Canada), and another 12 institutions conducted a retrospective... Read more

Business

view channel
Image: The Axium Neurostimulator System (Photo courtesy of Spinal Modulation).

St. Jude Medical Completes Acquisition of Spinal Modulation

Global medical device company St. Jude Medical (SJM; St. Paul, MN, USA) has completed the acquisition of Spinal Modulation (Menlo Park, CA, USA), developer of the Axium neurostimulator system.... Read more
 

Events

23 May 2015 - 25 May 2015
27 May 2015 - 29 May 2015
30 May 2015 - 02 Jun 2015
Copyright © 2000-2015 Globetech Media. All rights reserved.