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2021 Vol.53, Issue 5 Preview Page
Development of a Cellulose-Based Freshness Sensor (II) : Manufacture of Multilayer Freshness Sensor Using Cellulose-based Materials and Evaluation of Its Color Expression

셀룰로오스 기반 신선도 센서 개발 (II) : 다층 구조 신선도 센서 제조 및 색상 발현 평가

Yeon Hui Lee1
,
Hae Min Jo1
,
Do Hoon Kim1
,
Soo Hyun Lee1
,
Ji Young Lee2†
이연희 1
,
조해민 1
,
김도훈 1
,
이수현 1
,
이지영 2†
1Department of Forest Products, Gyeongsang National. University
2Department of Environmental Materials Science/IALS, Gyeongsang National University
1경상국립대학교 임산공학과, 학생
2경상국립대학교 환경재료과학과/농업생명과학연구원, 교수
†Corresponding author: E-Mail: paperyjy@gnu.ac.kr (Address: Department of Environmental Materials Science/IALS, Gyeongsang National University, Jinju 52828, Republic of Korea)
30 October 2021. pp. 82-89
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Abstract

Lately, the increase in consumers’ demand for food packaging safety standards to be followed has spurred a general interest in intelligent packaging technology that can monitor the status of the products in the packaging system. Commercialized sensors can indicate the freshness of food by expressing the colors based on the concentration levels of carbon dioxide (CO2) in the food item. However, most of the freshness sensors are manufactured from synthetic polymer materials; therefore, it is necessary to develop an eco-friendly freshness sensor that uses biodegradable and recyclable cellulose-based materials.

In this study, a multilayer freshness sensor was manufactured using cellulose-based materials such as commercial filter papers and cellulose nanofibers (CNFs) prepared in a laboratory. The filter paper with small pore size and large number of pores (No. 3) was selected by observing the color change of the immersed filter paper in a pH-sensitive dye, and used as a matrix expressing the specific color according to the CO2 concentration. The top layer was prepared using enzyme-pretreated CNF (EN-CNF) to make a transparent film, and the middle and bottom layers were prepared using the biowax-coated filter papers with the lowest air permeability due to the largest pore size (No. 4). Finally, a eco-friendly freshness sensor was assembled using the matrix, CNF film, and biowax-coated filter papers, whose color expressions clearly differed based on their CO2 concentration levels.

Keywords
Intelligent packaging
freshness sensor
cellulose nanofiber
filter paper
pH sensitive dye
biowax
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Information
  • Publisher :Korea Technical Association of The Pulp and Paper Industry
  • Publisher(Ko) :한국펄프종이공학회
  • Journal Title :Journal of Korea TAPPI
  • Journal Title(Ko) :펄프종이기술
  • Volume : 53
  • No :5
  • Pages :82-89
  • Received Date : 2021-09-29
  • Revised Date : 2021-10-20
  • Accepted Date : 2021-10-22
  • DOI :https://doi.org/10.7584/JKTAPPI.2021.10.53.5.82
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