Journal
FOOD HYDROCOLLOIDS
Volume 33, Issue 2, Pages 327-335Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2013.04.002
Keywords
Agar; Silver nanoparticles; Silver nitrate; Environmentally-friendly; Nanocomposite; Antimicrobial activity
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Funding
- R&D Convergence Center Support Program of Ministry for Food, Agriculture, Forestry and Fisheries, Republic of Korea [710003-03-2-SB320]
- Korea Food Research Institute
- Institute of Planning & Evaluation for Technology in Food, Agriculture, Forestry & Fisheries (iPET), Republic of Korea [710003074SB110] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Council of Science & Technology (NST), Republic of Korea [E0132600] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Composite films with silver nanoparticles (AgNPs), obtained by reduction of AgNO3 using an environmentally friendly method (combined reduction of AgNO3 by trisodium citrate solution and heating), and agar as a polymer matrix and a capping agent were prepared by solvent casting method. The surface color of the resulting agar/AgNPs films exhibited the characteristic plasmonic effect of the silver nanoparticles, and the characteristic properties of the composite films were greatly influenced by changing the concentration of AgNPs added. Significant increase in water vapor barrier properties and surface hydrophobicity were observed with increase in the concentration of AgNPs without reduction in the mechanical strength. In addition, the agar/AgNPs films loaded with more than 1 wt% of silver nanoparticles exhibited strong antimicrobial activity against both Gram-positive (Listeria monocytogenes) and Gram-negative (Escherichia coli O157:H7) bacterial pathogens. (C) 2013 Elsevier Ltd. All rights reserved.
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