Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Evaluation of Thermally Oxidized Soybean Oil Using Carbon Nanotube Sensor

탄소나노튜브를 이용한 대두유의 가열산화 특성평가

  • Lee, Eun-Ji (Department of Food Science and Engineering, Ewha Womans University) ;
  • Lim, Seung-Yong (Department of Food Science and Biotechnology, Kunsan National University) ;
  • Fai, Vincent Lau Chun (Department of Electrical Engineering, Korea University) ;
  • Ju, Byeong-Kwon (Department of Electrical Engineering, Korea University) ;
  • Oh, Sang-Suk (Department of Food Science and Engineering, Ewha Womans University)
  • 이은지 (이화여자대학교 식품공학과) ;
  • 임승룡 (군산대학교 식품생명공학과) ;
  • ;
  • 주병권 (고려대학교 전기전자전파공학부) ;
  • 오상석 (이화여자대학교 식품공학과)
  • Received : 2012.04.04
  • Accepted : 2012.07.01
  • Published : 2012.08.31
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Abstract

As people are being exposed to many types of fast food, rancid oil is a factor affecting public health. Monitoring of rancidity in frying oils needs to be done adequately. The chemical methods that are currently used require long periods of time and expertise. The development of a device that quickly and easily measures rancidity would be helpful to manage rancidity in frying oils adequately. Due to the fact that carbon nanotube (CNT) is sensitive to acid value, we used CNT as a sensing material for detecting oil rancidity. Polyethylenimine (PEI) was coated on CNT for stable measurements. Experiments were conducted at $100^{\circ}C$ after samples were cooled from $180^{\circ}C$. The results showed a strong correlation between acid values and resistances using CNT sensors. As the acid value of oils increased, the resistance of CNT sensors increased. Development of sensors using CNT may make it possible to determine the rancidity of frying oils in real-time and on site.

CNT 센서는 산가와의 연계성이 $R^2$>0.96으로 산가의 화학적 측정방법을 대체할 수 있는 유지의 산패도 측정기기로서 적합할 것으로 기대된다. 현재 유탕유의 품질에 대한 국내 법적 기준은 산가와 과산화물가를 기준으로 하고 있지만 일부 유럽국가의 기준인 polar-compounds 25%내외의 규정에 비하여 유지의 상태를 판별하는 데에 변화요구 가능성이 있어 국내규정에 대한 검토가 필요하다. 실험결과에서 산가와 CNT센서, 산가와 polar-compounds간의 높은 연관성을 확인하였으므로, CNT센서를 산가 뿐만 아니라, polar-compounds 측정법을 대신할 수 있는 장치로서 개발도 가능할 것이다. 다만, 식용오일마다 구성성분과 함량이 다르므로 보다 정밀한 유지의 산패도 측정이 가능하기 위해서는 식용유지의 종류별로 데이터베이스를 구축하는 것이 필요하다.

Keywords

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