Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Inhibition effect of herbs on the rancidity of soybean oil

허브의 첨가에 의한 대두유의 산패억제 효과

  • Ryu, Keun-Young (Food Analysis Division, Health and Environment Research Institute of Gwangju) ;
  • Kim, Ae-Gyeong (Food Analysis Division, Health and Environment Research Institute of Gwangju) ;
  • Kim, Tae-Sun (Food Analysis Division, Health and Environment Research Institute of Gwangju) ;
  • Lee, Hyang-Hee (Food Analysis Division, Health and Environment Research Institute of Gwangju) ;
  • Seo, Kye-Won (Food Analysis Division, Health and Environment Research Institute of Gwangju) ;
  • Cho, Bae-Sik (Food Analysis Division, Health and Environment Research Institute of Gwangju)
  • 류근영 (광주광역시 보건환경연구원 식품분석과) ;
  • 김애경 (광주광역시 보건환경연구원 식품분석과) ;
  • 김태순 (광주광역시 보건환경연구원 식품분석과) ;
  • 이향희 (광주광역시 보건환경연구원 식품분석과) ;
  • 서계원 (광주광역시 보건환경연구원 식품분석과) ;
  • 조배식 (광주광역시 보건환경연구원 식품분석과)
  • Received : 2018.01.11
  • Accepted : 2018.02.13
  • Published : 2018.02.28
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Abstract

In this study, we investigated the inhibition effect of various herbs on the rancidity of soybean oil. The antioxidant activity of herb-infused oils was evaluated by examining their total phenolic contents and DPPH radical scavenging abilities. The total phenolic contents were found to increase with addition of herbs to the soybean oil. Rosemary-infused oil (RO) exhibited the highest total phenolic contents ($77.28{\mu}g\;GE/mL$), followed by the lemon-balm-infused oil (LO), green-tea-infused oil (GO), and soybean oil (SO) alone (36.82, 36.66, and $21.24{\mu}g\;GE/mL$, respectively). Similary, the DPPH radical scavenging activity of the herb infused oil also increased. Moreover, measurements on the total polar compound (TPC) contents, acid value, and p-anisidine value were carried out in order to confirm the changes in the rancidity of the oils during frying. The time for the TPC content to reach 25% was confirmed to be delayed from 62 h for SO to 68 h, 74 h, and 80 h for GO, RO, LO, respectively. Even though there were some differences between the p-anisidine and acid values, it was confirmed that the addition of herbs inhibited the rancidity of soybean oil. Therefore, the results in this study show that adding herbs to soybean oil could positively contribute to the inhibition of oxidation and rancidity.

본 연구는 항산화 성분이 있다고 알려진 녹차, 로즈마리, 레몬밤을 이용하여 대두유의 튀김 중 산패 억제 가능성을 확인하고자 하였다. 허브의 복잡한 추출과정 없이 대두유에 침유시키는 방법으로 침출유를 제조하였고, 항산화 효과를 확인하기 위해 총 폴리페놀 함량과 DPPH 라디칼 소거능을 측정하였다. 그 결과 허브 침출유에서 대두유보다 항산화 활성이 증가되는 것으로 확인되어 항산화제의 첨가없이 허브의 첨가만으로도 항산화 효과를 증가시키는 것으로 확인되었다. 튀김과정중 산패의 정도를 확인하기 위해 총 극성화합물 함량(TPC)과 산가, p-anisidine가를 측정하였다. 튀김 과정 중 모든 유지의 총 극성화합물 함량은 지속적인 증가를 보였으며, 25% 도달 시점은 대두유가 62시간으로 산패가 가장 빨랐고, 허브 침출유에서는 레몬밤유(80시간) > 로즈마리유(74시간) > 녹차유(68시간) 순으로 총 극성화합물의 생성 억제가 확인되었다. 산가는 유지의 가열산화 과정 중 생성된 유리지방산을 측정하는 방법으로 모든 유지에서 튀김시간의 증가에 따라 상승하는 경향을 보여 TPC(%)의 경향과 유사하였다. 그러나 로즈마리유가 52시간 경과 후 부터 1.05 mg/g으로 대두유(1.04 mg/g)보다 더 증가하여, 허브의 종류에 따른 차이를 확인해 볼 필요성이 있을 것으로 판단된다. p-Anisidine가는 대부분 증가하다 일정 시간 후 감소하는 경향을 보였으며, 로즈마리유에서 가장 증가폭이 낮았다. 그러나 산가가 가장 낮았던 녹차유는 가열시간이 증가하는 동안 지속적으로 상승하여 가열 종료 시 82.3으로 가장 높은 결과를 보였다. 유지의 산패에 관여하는 성분들은 다양하여 여러 측정방법들을 사용하여 종합적인 판단에 의해 평가하여야 한다. 따라서 항상화 활성과 산패도의 결과를 종합해 볼 때 허브의 첨가가 대두유의 산패를 억제하는데 기여하는 것으로 판단되며, 각각의 허브들이 측정 방법들에 어떤 작용을 하는지에 대한 추가적인 연구가 필요할 것으로 생각된다.

Keywords

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