The purposes of this study are to develop a chitosan suspension for the carbon dioxide (CO2) concentration indication of packaged food and to investigate the changes in the CO2 indication corresponding to 2-amino-2-methylpropan- 1-ol (AMP) or 2-aminoethanol (monoethanolamine, MEA) addition. Chitosan suspension was prepared by adding chitosan (0.1, 0.2, and 0.4%) to distilled water and subsequently the pH of the suspension was adjusted to 7.0 after the addition of AMP or MEA. Changes in the pH and the turbidity of the chitosan suspension were measured over time under exposure in a normal atmosphere or 100% carbon dioxide environment. The pH of the chitosan suspension exposed at 100% carbon dioxide environment decreased rapidly up to approximately 6.3 in the initial CO2 exposure. The transmittance values of 0.1 and 0.2% chitosan suspensions with 5% AMP increased from 32 to 99% and from 19 to 86%, respectively. The addition of 5% AMP improved the visual indication performance of the chitosan suspension since it increased significantly the width of the transmittance value before and after CO2 exposure. The chitosan suspension with AMP has a potential to be used as a quality indicator of the packaged foods which produce carbon dioxide during storage and distribution.

서 론
 재료 및 방법
  재료
  키토산 현탁액의 pH에 따른 투과도 측정
  이산화탄소 농도 지시를 위한 키토산 현탁액의 제조
  키토산 현탁액의 현미경 및 외관 촬영
  이산화탄소 노출 환경에서 키토산 현탁액의 지시 반응
  AMP 및 MEA 첨가를 통한 키토산 현탁액의 지시성능 강화
 결과 및 고찰
  pH에 따른 키토산 현탁액의 투과도
  키토산 현탁액의 지시 반응
  AMP 및 MEA 첨가가 키토산 현탁액의 지시 성능에 미치는 영향
  AMP 첨가 키토산 현탁액의 이산화탄소 지시 반응
 요 약
 Reference

• 맹상붕(세종대학교 식품공학과) | Xiangpeng Meng
• 정준호(세종대학교 식품공학과) | Junho Jung
• 고상훈(세종대학교 식품공학과) | Sanghoon Ko Corresponding author