Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Changes in Chemical Components and Antioxidant Activity of Dried Jujube with Different Aging Temperatures and Durations

가온숙성온도와 기간에 따른 건대추의 성분과 항산화활성 변화

  • Park, Hye-Jin (Dept. of Food Science and Technology, Chungbuk National University) ;
  • Lee, Sang-Hoon (Dept. of Food Science and Technology, Chungbuk National University) ;
  • Kim, Hyun-Young (Dept. of Food Science and Technology, Chungbuk National University) ;
  • Jang, Gwi-Yeong (Dept. of Food Science and Technology, Chungbuk National University) ;
  • Hwang, In-Guk (Dept. of Agro-food Resources, National Academy of Agricultural Science, Rural Development Administration) ;
  • Woo, Koan-Sik (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration) ;
  • Kwon, Oh-Sung (RIS Boeun Bioresource & Food industry) ;
  • 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 : 2012.02.14
  • Accepted : 2012.04.24
  • Published : 2012.05.31
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Abstract

This study was conducted to investigate the changes in chemical components and antioxidant activities of dried jujube ($Zizyphus$ $jujuba$ Miller) with different aging temperatures ($60^{\circ}C$, $70^{\circ}C$, and $80^{\circ}C$) and durations (5 days, 10 days, 15 days, 30 days, and 50 days). The browning index increased from 0.124 to 1.998 with increased aging temperature and duration. As aging duration increased, fructose, glucose, and sucrose content decreased from 24.96% to 4.96%, from 22.23% to 4.41%, and from 18.41% to 0%, respectively. Reducing sugar content decreased from 351.52 mg/g to 155.96 mg/g as aging temperature and duration increased. Total acidity slightly increased from 1.61 to 3.13%. 5-Hydroxymethyl-2-furaldehyde increased from 0.002 mg/g to 38.84 mg/g, respectively. As aging temperature and duration increased, total polyphenol content increased from 15.98 mg/g to 38.61 mg/g. DPPH and ABTS radical scavenging activities increased from 4.03 mg trolox eq/g to 22.22 mg trolox eq/g, and from 2.11 mg ascorbic acid eq/g to 13.39 mg ascorbic acid eq/g, respectively. Reducing power increased rapidly in the first stage and then slowly increased afterward.

숙성온도와 기간에 따른 대추의 성분변화 및 항산화활성 변화를 분석한 결과 갈변도는 무처리구에 비해 가온숙성처리구에서 전체적으로 증가하였으며, 숙성 30일차 및 50일차에서는 다소 감소하는 경향을 보였다. 환원당, fructose와 glucose함량은 가온숙성처리구에서 높았으며, 숙성온도 및 기간이 증가함에 따라 유의적으로 감소하였다. 5-HMF 함량은 숙성온도 및 기간이 증가함에 따라 증가하여 숙성 50일차 $80^{\circ}C$에서 최대값을 나타내었다. 총 폴리페놀 함량도 숙성 온도와 기간이 증가함에 따라 증가하였으며, DPPH 라디칼 소거능 및 ABTS 라디칼 소거능도 가온숙성처리구에서 높았으며, 환원력은 숙성온도가 증가함에 따라서 증가하였지만 숙성일수에 따른 변화는 작게 나타났다. 숙성 온도 및 기간이 증가함에 따라 페놀성 화합물의 증가로 인하여 항산화 활성도 증가하였으며, 대추의 항산화활성을 높일 수 있는 최적숙성조건은 $70^{\circ}C$에서 15~30일로 판단되었다. 이를 통하여 건대추의 항산화 활성을 향상시켜 새로운 건강기능성 식품소재로 이용가능하며, 이에 따라 대추의 활용도 제고 및 부가가치를 높일 수 있을 것으로 판단된다.

Keywords

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