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Physicochemical Characteristics of Sorghum Tea according to Milling Type and Pan-fried Time

도정도와 볶음시간에 따른 수수차의 이화학적 특성

  • Ko, Jee Yeon (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration) ;
  • Woo, Koan Sik (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration) ;
  • Song, Seuk Bo (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration) ;
  • Seo, Hye In (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration) ;
  • Kim, Hyun Young (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration) ;
  • Kim, Jung In (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration) ;
  • Lee, Jae Saeng (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration) ;
  • Jung, Tae Wook (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration) ;
  • Kim, Ki Young (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration) ;
  • Kwak, Do Yeon (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration) ;
  • Oh, In Seok (Dept. of Functional Crop, National Institute of Crop Science, Rural Development Administration)
  • 고지연 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 우관식 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 송석보 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 서혜인 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 김현영 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 김정인 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 이재생 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 정태욱 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 김기영 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 곽도연 (농촌진흥청 국립식량과학원 기능성작물부) ;
  • 오인석 (농촌진흥청 국립식량과학원 기능성작물부)
  • Received : 2012.08.02
  • Accepted : 2012.09.04
  • Published : 2012.11.30

Abstract

In this study, sorghum teas were prepared from Sorghum bicolor L. Moench subjected to different types of milling (no milling (0%), minimum milling (5%), and milling (20%)) and pan-firing times (1 to 10 minutes), and its quality characteristics were investigated. With regards to milling type, total polyphenolic, flavonoid, tannin contents, and antioxidant activities of ethanol extracts from both no milling sorghum and its tea were highest, followed by minimum milling and milling in decreasing order. Crude nitrogen content was highest in milling sorghum and its tea regardless of pan-firing time. With regards to pan-firing time, total polyphenolic, flavonoid, tannin contents, and antioxidant activities of sorghum teas increased with increasing pan-firing time regardless of milling type. The highest DPPH and ABTS radical scavenging activities were observed at a pan-firing time between 7 to 9 minutes. In contrast to ethanol extracts of pan-fried sorghum tea, antioxidant activities, chromaticity, and turbidity of hot water leaching liqueur of sorghum tea were highest in milling sorghum tea, followed by minimum milling and no milling sorghum tea.

항산화성 높은 수수의 식품으로서의 이용기술을 개발하여 새로운 소비수요를 창출하고자 도정도가 다른 수수를 이용하여 볶음차를 제조하고 이러한 수수차 제조과정이 수수의 항산화성분 및 항산화활성에 미치는 변화를 살펴보았다. 미도정(0%), 최소 도정(5%), 도정(20%)으로 도정 정도가 다른 수수를 1~10분간 볶음처리하여 항산화성분 및 활성 변화를 살펴본 결과 수수 볶음차의 총 폴리페놀, 플라보노이드 및 탄닌 함량과 DPPH 및 ABTS radical 소거활성은 볶음시간이 길어질수록 증가하다가 7~9분 사이 가장 높은 값을 나타내고 이후 약간 감소하는 경향이었다. 수수의 도정도별로는 미도정 수수를 볶음처리한 수수차에서 페놀성 화합물 및 항산화활성이 총 폴리페놀 12.95 mg GAE/g, 플라보노이드 7.43 mg CE/g 및 DPPH 및 ABTS radical 소거활성 19.97 및 33.11 mg TE/g으로 가장 높았으며, 다음으로 최소 도정 수수 볶음차, 도정 수수 볶음차의 순이었다. 이와는 다르게 도정도별 수수 볶음차의 열수 침출물의 항산화활성은 도정 수수 볶음차에서 가장 높았고, 다음으로 최소 도정 수수 볶음차, 미도정 수수 볶음차의 순이었으며, 이는 수수 볶음차열수 침출액의 색도 및 탁도와 같은 경향으로 도정 수수 볶음차의 경우 종피의 손상에 의해 오히려 열수에 의한 색소 및 항산화성 물질의 용출이 증가한 것으로 생각되었다.

Keywords

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