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Chemical Composition and Antioxidant Activity of Deoduk (Codonopsis lanceolata) and Doragi (Platycodon grandiflorum) according to Temperature

열처리 온도에 따른 더덕과 도라지의 화학성분과 항산화활성

  • Hwang, Cho-Rong (Dept. of Food Science and Technology, Chungbuk National University) ;
  • Oh, Seung-Hee (Dept. of Food Science and Technology, Chungbuk National University) ;
  • Kim, Hyun-Young (Dept. of Food Science and Technology, Chungbuk National University) ;
  • Lee, Sang-Hoon (Dept. of Food Science and Technology, Chungbuk National University) ;
  • Hwang, In-Guk (Dept. of Agro-food Resources, National Academy of Agricultural Science, RDA) ;
  • Shin, Yu-Su (Dept. of Herbal Crop Research, Ginseng Research Division, RDA) ;
  • Lee, Jun-Soo (Dept. of Food Science and Technology, Chungbuk National University) ;
  • Jeong, Heon-Sang (Dept. of Food Science and Technology, Chungbuk National University)
  • Received : 2011.03.29
  • Accepted : 2011.05.09
  • Published : 2011.06.25

Abstract

We investigated the changes in chemical composition and antioxidant activity of Deoduk (Codonopsis lanceolata) and Doragi (Platycodon grandiflorum) with heating. Deoduk and Doragi were heated to $110\sim150^{\circ}C$ for 2 hours. The total polyphenol content of Deoduk and Doragi reached high values of 6.31 and 7.34 mg/g, respectively, at $150^{\circ}C$. The total polyphenol content of raw Deoduk and Doragi were 0.60 and 0.59 mg/g, respectively. The DPPH radical scavenging activity ($IC_{50}$) of Deoduk and Doragi decreased from 13.94 and 6.83 mg/mL, respectively, in raw samples to 0.81 and 0.94 mg/mL, respectively, in samples heated to $150^{\circ}C$. The ABTS radical scavenging activity of Deoduk and Doragi increased from 0.43 and 0.21 mg AA eq/g, respectively, in raw samples to 3.55 and 4.83 mg AA eq/g, respectively, in samples heated to $150^{\circ}C$. The reducing power of raw Deoduk and Doragi was 0.1 and 0.06, respectively, which was increased to 0.54 and 0.50, respectively, in samples heated to $150^{\circ}C$. Fructose content decreased after heating to $130^{\circ}C$. The sucrose content of the samples increased slowly with heating up to $120^{\circ}C$, but was not detected at warmer temperatures. The organic acid and 5-HMF of the samples increased gradually with increasing temperature.

열처리에 따른 더덕과 도라지의 성분과 항산화활성 변화를 살펴보기 위하여 $110\sim150^{\circ}C$에서 2시간 열처리한 후 항산화활성 및 유리당, 유기산, 5-HMF 함량을 살펴보았다. 총 폴리페놀 함량은 대조구에서 각각 0.60 및 0.59 mg GA eq/g 이었으며, $150^{\circ}C$에서는 각각 6.31 및 7.34 mg GA eq/g으로 증가하였다. 항산화활성은 열처리 온도의 증가에 따라 증가 하였으며, 환원력도 대조구의 0.1 및 0.06에서 열처리 후 0.54 및 0.50으로 증가하였다. 더덕의 fructose 함량은 $120^{\circ}C$까지는 증가하다가 $130^{\circ}C$ 이상에서는 감소하였으며 sucrose의 함량은 $130^{\circ}C$ 이상의 온도에서는 검출되지 않았다. 도라지 fructose 함량은 $130^{\circ}C$까지는 계속 증가하였으나 $140^{\circ}C$ 이상의 온도에서는 감소하였으며 sucrose 함량은 더덕과 마찬가지로 $130^{\circ}C$ 이상의 온도에서는 검출되지 않았다. 유기산은 더덕과 도라지에서 모두 열처리 온도가 증가함에 따라 증가하였다. 5-HMF 함량은 대조구에서는 검출되지 않았으며 110 및 $120^{\circ}C$에서는 변화가 작았지만 $130^{\circ}C$ 이상의 온도에서는 급격한 증가를 보였다.

Keywords

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