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Continuous release of gentamicin from gold nanocarrier

Perni, Stefano and Prokopovich, Polina ORCID: 2014. Continuous release of gentamicin from gold nanocarrier. RSC Advances 4 (94) , pp. 51904-51910. 10.1039/C4RA10023A
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Antibiotics are still the most effective agents used to fight bacterial infections. Antibiotics are quickly metabolised or excreted from the human body, thus they need to be frequently administered (a few times a day) and their half life is usually an important factor in the therapeutic choice. In order to render the administration less frequent, antibiotic release from a carrier can be employed. In this work we covalently bound gentamicin to gold nanoparticles capped with cysteine or glutathione as gold nanoparticles are biologically safe. The conjugates exhibited antimicrobial activity against both S. aureus and MRSA at concentrations as low as 0.1 mg NP per ml consistent with an antibiotic load of 1–2% w/w as determined through TGA. No antimicrobial activity was exhibited by the unconjugated nanoparticles. The release of gentamicin from the conjugates was monitor in buffer solutions at pH = 7 and the antibiotic concentration continued to increase over two days. This work demonstrates that gold nanoparticles can be employed as antibiotic carriers providing a continuous release of antibiotic over a few days. Glutathione appeared to be a better coupling agent than cysteine allowing a higher load of gentamicin resulting in lower inhibitory concentrations of the conjugates.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Pharmacy
Subjects: R Medicine > RM Therapeutics. Pharmacology
Publisher: RSC Publishing
ISSN: 2046-2069
Funders: Arthritis Research UK (ARUK:18461)
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 8 October 2014
Last Modified: 02 Oct 2023 20:49

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