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2021 Vol.53, Issue 6 Preview Page
Preparation and Characterization of Whey Protein Isolate-based Coating Solutions and Coated Papers with Different Plasticizers

가소제의 종류에 따른 분리유청단백질 기반 코팅액 제조 및 이를 활용한 코팅지의 물성에 대한 연구

Kyuryeon Lee1
,
Jeyoung Jung2
,
Dowan Kim3†
이규련 1
,
정제영 2
,
김도완 3†
1Department of Food Processing & Distribution, College of Life Science, Gangneung-Wonju University
2Korea Packaging Center, Korea Institute of Industrial Technology
3Department of Food Processing & Distribution, College of Life Science, Gangneung-Wonju University
1강릉원주대학교, 생명과학대학, 식품가공유통학과, 학생
2한국생산기술연구원, 패키징기술센터, 연구원
3강릉원주대학교, 생명과학대학, 식품가공유통학과, 교수
†Corresponding author: E-Mail: dowankim@gwnu.ac.kr (Address: Department of Food Processing & Distribution, College of Life Science, Gangneung-Wonju University, Gangneung, 25457, Republic of Korea)
30 December 2021. pp. 28-38
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Abstract

Whey protein isolates (WPIs) are a byproduct of cheese and milk processing. WPI-based films offer transparency and good gas barrier properties at a low relative humidity, along with numerous different functional groups. However, they are hydrophilic, which restricts their use, and feature poor mechanical properties like brittleness. In this study, we explored the properties of WPI based coating materials depending on the type and contents of plasticizers, to use as a barrier coating materials for paper. Coating materials of WPI/glycerol (GY) and WPI/sorbitol (SO) with different plasticizer contents were prepared by solution blending. These materials were then coated on the surface of paper. The morphological structure, burst strength, tensile index, elongation at break, air permeability, and surface properties of the WPI/GY and WPI/SO-coated papers were investigated and compared based on the type and content of plasticizer. Compared to the WPI/GY-coated papers, the cracking of coating layers on the WPI/SO-coated papers was mitigated with increasing SO content in the WPI matrix. The WPI/SO-coated papers exhibited a higher tensile index, elongation at break, and air barrier than the WPI/GO-coated papers. Surface property analysis revealed that the hydrophilicity of both coated papers increased with increasing plasticizer content. However, further research is needed to reduce the hydrophilicity in WPI-coated papers and improve the compatibility between WPI and the plasticizer to enable their application in packaging.

Keywords
Whey protein isolate
glycerol
sorbitol
plasticizer
physical properties
paper packaging
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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 :6
  • Pages :28-38
  • Received Date : 2021-07-20
  • Revised Date : 2021-12-13
  • Accepted Date : 2021-12-14
  • DOI :https://doi.org/10.7584/JKTAPPI.2021.12.53.6.28
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