• 主页
  • 查找结果
  • Evaluation of antimicrobial activity of silver nanoparticles for carboxymethylcellulose film applications in food packaging.

Evaluation of antimicrobial activity of silver nanoparticles for carboxymethylcellulose film applications in food packaging.

Journal of nanoscience and nanotechnology (2014-04-25)
Maria C Siqueira, Gustavo F Coelho, Márcia R de Moura, Joana D Bresolin, Silviane Z Hubinger, José M Marconcini, Luiz H C Mattoso
摘要

In this study, silver nanoparticles were prepared and incorporated into carboxymethylcellulose films to evaluate the antimicrobial activity for food packaging applications. The techniques carried out for material characterization were: infrared spectroscopy and thermal analysis for the silver nanoparticles and films, as well as particle size distribution for the nanoparticles and water vapor permeability for the films. The antimicrobial activity of silver nanoparticles prepared by casting method was investigated. The minimum inhibitory concentration (MIC) value of the silver nanoparticles to test Gram-positive (Enterococcus faecalis) and Gram-negative (Escherichia coli) microorganisms was carried out by the serial dilution technique, tested in triplicate to confirm the concentration used. The results were developed using the Mcfarland scale which indicates that the presence or absence of turbidity tube demonstrates the inhibition of bacteria in relation to the substance inoculated. It was found that the silver nanoparticles inhibited the growth of the tested microorganisms. The carboxymethylcellulose film embedded with silver nanoparticles showed the best antimicrobial effect against Gram-positive (E. faecalis) and Gram-negative (E. coli) bacteria (0.1 microg cm(-3)).

材料
货号
品牌
产品描述

Sigma-Aldrich
羧甲基纤维素钠, average Mw ~90,000
Sigma-Aldrich
羧甲基纤维素 钠盐, low viscosity
Sigma-Aldrich
羧甲基纤维素 钠盐, High viscosity
Sigma-Aldrich
羧甲基纤维素 钠盐, Medium viscosity
Sigma-Aldrich
银, conductive paste
Sigma-Aldrich
羧甲基纤维素钠, average Mw ~700,000
Sigma-Aldrich
羧甲基纤维素钠, average Mw ~250,000, degree of substitution 0.7
Sigma-Aldrich
羧甲纤维素 钠, meets USP testing specifications, Medium viscosity
Sigma-Aldrich
羧甲基纤维素钠, average Mw ~250,000, degree of substitution 0.9
Sigma-Aldrich
羧甲基纤维素钠, average Mw ~250,000, degree of substitution 1.2
Sigma-Aldrich
羧甲基纤维素 钠盐, medium viscosity
Sigma-Aldrich
银纳米线悬浮液, diam. × L 120-150 nm × 20-50 μm, 0.5% (isopropyl alcohol suspension)
Sigma-Aldrich
羧甲基纤维素 钠盐, ultra high viscosity, highly purified
Sigma-Aldrich
银, colloidal, 65-75% Ag basis
Sigma-Aldrich
银, foil, thickness 1.0 mm, 99.99% trace metals basis
银, foil, 25x25mm, thickness 1.0mm, as rolled, 99.95+%
Sigma-Aldrich
银, foil, thickness 1.0 mm, 99.9% trace metals basis
银, wire reel, 20m, diameter 0.25mm, annealed, 99.99%
银, insulated wire, 50m, conductor diameter 0.05mm, insulation thickness 0.0075mm, polyester insulation, 99.99%
银, wire reel, 1m, diameter 0.8mm, as drawn, 99.99%
银, wire reel, 5m, diameter 0.35mm, annealed, 99.99%
银, wire reel, 10m, diameter 1.0mm, annealed, 99.99%
银, foil, 50x50mm, thickness 3mm, as rolled, 99.95+%
银, rod, 100mm, diameter 2.0mm, as drawn, 99.95+%
银, foil, 25x25mm, thickness 1.0mm, as rolled, 99.99+%
银, wire reel, 100m, diameter 0.125mm, annealed, 99.99%
银, wire reel, 10m, diameter 0.125mm, annealed, 99.99%
银, wire reel, 10m, diameter 0.05mm, annealed, 99.99%
银, wire reel, 0.2m, diameter 1.0mm, annealed, 99.99%
银, wire reel, 2m, diameter 0.5mm, annealed, 99.99%