Biological synthesis of copper nanoparticles using Magnolia kobus leaf extract and their antibacterial activity. Issue 11 (3rd April 2013)

• Record Type: Journal Article
• Authors: Lee, Hyo‐Jeoung; Song, Jae Yong; Kim, Beom Soo
• Is Part Of: Journal of chemical technology & biotechnology. Volume 88:Issue 11(2013:Nov.)
• Page Start: 1971
• Page End: 1977
• Publication Date: 2013-04-03
• Subjects: Biotechnology -- Periodicals; Chemistry, Technical -- Periodicals; Chemical engineering -- Periodicals; Industries -- Environmental aspects -- Periodicals; 660
• DOI: 10.1002/jctb.4052
• Languages: English
• ISSNs: 0268-2575

Abstract

<abstract abstract-type="main"> <title>Abstract</title> <sec id="jctb4052-sec-0001" sec-type="section"> <title>Bakground</title> <p> <bold>Biological methods for metal nanoparticle synthesis using plant extracts have been suggested as possible ecofriendly alternatives to chemical and physical methods. In the present study, copper nanoparticles were biologically synthesized using <italic>Magnolia kobus</italic> leaf extract as reducing agent and their antibacterial activity was evaluated against <italic>Escherichia coli</italic>.</bold> </p> </sec> <sec id="jctb4052-sec-0002" sec-type="section"> <title>Results</title> <p> <bold>On treatment of aqueous solution of CuSO<sub>4</sub>·5H<sub>2</sub>O with <italic>Magnolia kobus</italic> leaf extract, stable copper nanoparticles were formed. UV–vis spectroscopy was used to monitor the quantitative formation of copper nanoparticles. The synthesized nanoparticles were characterized with inductively coupled plasma spectrometry (ICP), energy dispersive X‐ray spectroscopy (EDS), X‐ray photoelectron spectroscopy (XPS), and high‐resolution transmission electron microscopy (HR‐TEM). Electron microscopy analysis of copper nanoparticles indicated that they ranged in average size from 37 to 110 nm. Antibacterial tests were carried out by counting viable <italic>E. coli</italic> cells after 24 h growth in shake flasks containing latex foams coated with copper nanoparticles. As a result, foams coated with biologically synthesized copper nanoparticles showed higher antibacterial activity compared with foams untreated and foams treated with chemically synthesized copper nanoparticles using sodium borohydride and Tween 20. The antibacterial activities were inversely proportional to the average nanoparticle sizes.</bold> </p> </sec> <sec id="jctb4052-sec-0003" sec-type="section"> <title>Conclusion</title> <p> <bold>The present results show that stable copper nanoparticles can be ecofriendly synthesized using <italic>Magnolia kobus</italic> leaf extract, offering an inexpensive alternative to antibacterial silver nanoparticles. © 2013 Society of Chemical Industry</bold> </p> </sec> </abstract>