Optimization of Gold Nanoparticle Biosynthesis by Escherichia coli DH5α and its Conjugation with Gentamicin

Abstract:

Metal nanoparticles are one option for targeted drug delivery. In order to increase antibiotic efficiency and decrease its side effects, antibiotic conjugated nanoparticles have been known as a suitable approach. The aim of this study was optimization of gold nanoparticle biosynthesis by Escherichia coli DH5α and its conjugation with gentamicin. For this purpose gold nanoparticles were biosynthesized from HAuCl₄ and confirmed by Uv/ Vis, XRD, DLS and SEM. Then the effects of different parameters on optimum conditions for gold nanoparticles production were investigated. The MIC and MBC of gentamicin and its conjugate were investigated against E. coli, Clostridium perfringens and Clostridium botulinum. The results revealed that among different treatments, centrifuge (10000 rpm, 10 min) and sonication are the optimum conditions for gold nanoparticle production with less than 10 nm sizes. Filtration was also the best method for purifying nanoparticles. The conjugated nanoparticles significantly reduced the MIC of gentamicin against E. coli and also overcame the natural resistance of tested anaerobic bacteria. In conclusion, the optimized method is an effective, inexpensive and environmental friendly method for biosynthesis of gold nanoparticles. Overcoming natural resistance of anaerobic bacteria using antibiotic conjugates with nanoparticles provides hopes for further experiments and in vivo studies.

• Periodical: Journal of Nano Research (Volume 32)
• Pages: 93-105
• DOI: https://doi.org/10.4028/www.scientific.net/JNanoR.32.93
• Online since: May 2015
• Authors: Hossein Motamedi*, Samaneh Khademi Mazdeh, Azim Akbarzadeh Khiavi, Mohammad Reza Mehrabi
• Keywords: Biosynthesis, Conjugation, Gold, Nanoparticle, Optimization

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