Journal
CARBOHYDRATE POLYMERS
Volume 130, Issue -, Pages 353-363Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2015.05.018
Keywords
Silver nanoparticles; Amino acids; Agar; Nanocomposite film; Antibacterial activity
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Funding
- Cooperative Research Program for Agriculture Science & Technology Development of the Rural Development Administration, Republic of Korea [PJ009975]
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Silver nanoparticles (AgNPs) were synthesized using amino acids (tyrosine and tryptophan) as reducing and capping agents, and they were incorporated into the agar to prepare antimicrobial composite films. The AgNPs solutions exhibited characteristic absorption peak at 420 nm that showed a red shift to similar to 434 nm after forming composite with agar. XRD data demonstrated the crystalline structure of AgNPs with dominant (1 1 1) facet. Apparent surface color and transmittance of agar films were greatly influenced by the AgNPs. The incorporation of AgNPs into agar did not exhibit any change in chemical structure, thermal stability, moisture content, and water vapor permeability. The water contact angle, tensile strength, and modulus decreased slightly, but elongation at break increased after AgNPs incorporation. The agar/AgNPs nanocomposite films possessed strong antibacterial activity against Listeria monocytogenes and Escherichia coli. The agar/AgNPs film could be applied to the active food packaging by controlling the food-borne pathogens. (C) 2015 Elsevier Ltd. All rights reserved.
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