KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY (한국포장학회지)

Korea Society of Packaging Science and Technology (한국포장학회)
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UV Barrier and Antimicrobial Activity of Agar-based Composite Films Incorporated with ZnO Nanoparticles and Grapefruit Seeds Extract

ZnO 나노입자와 자몽씨추출물을 첨가한 아가복합필름의 자외선차단 및 항균특성

  • Kim, Yeon Ho (Department of Food and Nutrition, Kyung Hee University) ;
  • Bang, Yeong-Ju (Department of Food and Nutrition, Kyung Hee University) ;
  • Yoon, Ki Sun (Department of Food and Nutrition, Kyung Hee University) ;
  • Rhim, Jong-Whan (Department of Food and Nutrition, Kyung Hee University)
  • 김연호 (경희대학교 식품영양학과) ;
  • 방영주 (경희대학교 식품영양학과) ;
  • 윤기선 (경희대학교 식품영양학과) ;
  • 임종환 (경희대학교 식품영양학과)
  • Received : 2019.09.02
  • Accepted : 2019.11.04
  • Published : 2019.12.31
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Abstract

Agar-based nanocomposite films were prepared by incorporation of zinc oxide nanoparticles (ZnONP) and grapefruit seed extract (GSE). The composite films were characterized using FT-IR, UV-visible spectroscopy and thermalgravimetric analysis (TGA). The composite films showed light absorption peaks at 220 and 380 nm, characteristic for GSE and ZnONP, respectively. The UV-light transmittance of the agar film was markedly reduced from 54.4 ± 1.3% to 5.8 ± 2.5% with little sacrifice of transparency when 3 wt% ZnONP and 5 wt% GSE were added. The mechanical and water vapor barrier properties increased slightly though they were not significant statistically by the addition of ZnONP and GSE. The nanocomposite films showed stronger antibacterial activity against L. monocytogenes than E. coli O157: H7 and the antibacterial activity was affected by bacterial types as well as concentrations of ZnONP and GSE. The nano-composite film incorporated with 3 wt% of ZnONP and 5 wt% of GSE exhibited strong antibacterial activity against Listeria monocytogenes and E. coli O157: H7. The results indicate that 3 wt% of ZnONP and 5 wt% of GSE are the optimal concentrations for producing functional agar/ZnONP/GSE composite films.

자몽씨추출물(GSE)과 ZnONP을 아가필름에 동시에 첨가하여 다기능성 복합필름을제조하였다. Agar/GSE/ZnONP복합필름은 특히 자외선차단성과 항균성에 대한 시너지 효과를 나타냈다. 광 차단성은 자외선 파장범위인 280 nm와 가시광선 파장범위인 660 nm에서 유의적인 차이를 보이며 크게 나타났다. 자외선차단성은 agar/GSE와 agar/ZnONP 필름에 비해 agar/ZnONP3%/GSE5% 필름에서의 크게 상승하여 GSE와 ZnONP의 시너지 효과를 확인할 수 있었다. 항균성으로는 그람양성균인 L. monocytogenes와 그람음성균인 E. coli O157: H7 모두 agar/ZnONP3%/GSE5% 필름에서 강한 항균성 및 시너지 효과가 있었다. 자외선 차단성과 항균성은 포장식품의 안전성을 확보하고 유통기한을 연장시키는데 필수적인 특성으로 agar/ZnONP3%/GSE5% 필름은 식품의 유통기한 연장과 식품의 안전성을 위한 포장필름으로 활용 가치가 높을 것으로 사료된다.

Keywords

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