• 펄프종이기술
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• 제46권4호
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• pp.28-36
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• 2014

We studied the green synthesis and antibacterial activity of paper coated with chitosan-silver (Ag) green nanocomposites for packaging applications. Green synthesis of Ag nanoparticles (AgNPs) was achieved by a chemical reaction involving a mixture of chitosan-silver nitrate ($AgNO_3$) in an autoclave at 15 psi, $121^{\circ}C$, for 30 min. AgNPs and their formation in chitosan was confirmed by UV-Vis spectroscopy, transmission electron microscopy (TEM) and dynamic light scattering (DLS). As-prepared chitosan-AgNPs composite materials were coated on manila paper using Meyer rod. Surface morphology and Ag contents in coating layer were characterized by field emission scanning electron microscopy (FESEM) and energy dispersive spectroscopy (EDS). The mechanical properties such as tensile strength and elongation were significantly affected by coating with chitosan-AgNPs. The antibacterial test of coated paper was performed qualitatively and quantitatively against Escherichia coli (E. coli). It was shown to be effective in suppressing the growth of E. coli with increasing Ag contents on the surface of coated paper and more than 95 R (%) of antimicrobial rate was obtained at chitosan-AgNPs coated papers.

• 펄프종이기술
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• 제46권2호
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• pp.8-15
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• 2014

A novel antibacterial paper coated with chitosan-based silver (Ag) nanocomposite prepared by green synthesis has been investigated for a wide range of application in food, agricultural and medical packaging. Green synthesis of Ag nanoparticles (AgNPs) was carried out by a chemical reaction involving a mixture of chitosan-silver nitrate (AgNO3) in an autoclave at 15 psi, $121^{\circ}C$, for 15-120 sec. AgNPs and their formation in chitosan were confirmed by both UV-Vis spectroscopy and transmission electron microscope (TEM). Fourier transform infrared spectroscopy (FTIR) study showed that free amino groups in chitosan act as an effective reductant and AgNPs stabilizer. Antibacterial test of coated paper with as-prepared chitosan-AgNPs was performed qualitatively against E. coli based on the formation of halo zones around coated papers and it was shown to be effective in suppressing the growth of E. coli with increasing Ag contents in coating layer.

• Applied Biological Chemistry
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• 제41권6호
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• pp.442-446
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• 1998

분자량이 다른 3가지 종류의 키토산의 Escherichia coli에 대한 항균효과를 측정하였고 이들을 라이너지 코팅에 적용했을 때의 균성장억제 효과와 지류포장재에 적용했을 때 딸기의 저장기간을 증대시키는지에 대해 연구했다. 키토산은 그 분자량에 따라 항균효과가 다른 것으로 알려지고 있는데 본 연구에서 사용한 3가지 종류의 키토산은 E. coli에 대하여 모두 항균효과를 보였다. 키토산 A에서는 40 ppm 이상에서 항균효과를 보였으며 키토산 B와 C는 10 ppm 이상에서 항균효과를 나타내었다. 라이너지에 3가지 종류의 키토산을 코팅하여 항균효과를 보았는데 라이너지에 코팅된 상태에서도 세 종류의 키토산은 균의 성장을 저해하는 것을 보여주었다. 분자량이 다른 3가지 종류의 키토산에서 가장 큰 항균효과를 보이는 키토산 B를 코팅한 지류포장재로 딸기를 포장하여 저장실험을 행하였다. 딸기의 저장증대 효과는 저온저장이 가장 중요하다는 것을 보여 주었으며 포장방법별 저장증대 효과에서는 키토산을 코팅한 지류포장재가 딸기의 저장기간을 증대시키는 것을 보여주었다.