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Received May 18, 2012
Accepted May 31, 2012
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Antibacterial latex foams coated with biologically synthesized silver nanoparticles using Magnolia kobus leaf extract
Department of Chemical Engineering, Chungbuk National University, Cheongju, Chungbuk 361-763, Korea
bskim@chungbuk.ac.kr
Korean Journal of Chemical Engineering, December 2012, 29(12), 1771-1775(5), 10.1007/s11814-012-0082-4
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Abstract
Silver nanoparticles are used in many industries due to their disinfection and antibacterial properties. Biological methods of nanoparticle synthesis have been suggested as possible ecofriendly alternatives to chemical and physical methods. In this study, biologically synthesized silver nanoparticles using Magnolia kobus leaf extract were coated on the surface of latex foam products using dip coating (exposure to nanoparticle solution) or ultrasonic treatment. SEM image of the treated foam showed that silver nanoparticles were uniformly coated on the surface of latex foam. Antibacterial properties were tested by counting viable Escherichia coli cells after 24 h growth in shake flask cultures containing latex foams coated with silver nanoparticles. Foams coated with silver nanoparticles showed higher antibacterial activities compared with foams untreated. Smaller silver nanoparticles synthesized at higher temperature showed higher antibacterial activity due to the larger specific surface area and higher content of silver nanoparticles. The growth of E. coli decreased with increasing the concentration of silver nanoparticles. Ultrasonic treatment showed higher adsorption and lower desorption of silver nanoparticles to and from the foams compared with dip coating, resulting in higher antibacterial activity.
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Marambio-Jones C, Hoek EMV, J. Nanopart. Res., 12, 1531 (2010)
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Choi O, Hu Z, Environ. Sci. Technol., 42, 4583 (2008)
Kvitek L, Panacek A, Soukupova J, Kolar M, Vecerova R, Prucek R, J. Phys. Chem. C., 112, 5825 (2008)
Suresh AK, Pelletier DA, Wang W, Moon JW, Gu B, Mortensen NP, Allison DP, Joy DC, Phelps TJ, Doktycz MJ, Environ. Sci. Technol., 44, 5210 (2010)
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Sharma VK, Yngard RA, Lin Y, Adv. Colloid Interface Sci., 145, 83 (2009)
Rai M, Yadav A, Gade A, Biotechnol. Adv., 27, 76 (2009)
