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Quality Characteristics of Grape Pomace with Different Drying Methods

건조방법에 따른 포도 가공부산물의 품질특성

  • Yook, Hong-Sun (Dept. of Food & Nutrition, Chungnam National University) ;
  • Kim, Kyoung-Hee (Dept. of Food & Nutrition, Chungnam National University) ;
  • Jang, Soon-Ae (Industry Academic Cooperation Foundation, Youngdong University)
  • Received : 2010.06.08
  • Accepted : 2010.06.30
  • Published : 2010.09.30

Abstract

Improvement in the utilization of grape pomace, antioxidant activities and antioxidant compounds of grape pomace was analyzed to clarify the influence of drying method such as $80^{\circ}C$ hot air and freeze ($-70^{\circ}C$) drying process. For proximate composition, crude protein and fat contents of hot air drying sample were higher than freeze drying sample. The lightness and redness values of freeze drying sample were higher than hot air drying sample, but yellowness of hot air drying sample was higher. The contents of total polyphenols and anthocyanins were higher in freeze drying sample. DPPH radical scavenging activity and ABTS scavenging activity of freeze drying sample were higher than hot air drying sample. The reducing power and FRAP value of hot air drying sample was higher than freeze drying sample. The result indicated that freeze drying method is slightly better than hot air drying method for antioxidant compounds and antioxidant activity.

폐자원으로써 버려지는 포도 가공부산물의 활용을 위한 기초연구로 본 연구에서는 포도부산물의 건조방법에 따른 일반성분, 색도, pH, 항산화성분 및 활성을 비교분석 하였다. 일반성분의 경우, 회분, 조지방, 조단백 함량은 열풍건조시료에서 더 높은 함량을 나타내었다. 색도 측정결과, L값(명도)과 a값(적색도)은 동결건조 한 시료가 더 높게 나타난 반면, b값(황색도)의 경우 열풍건조시료에서 높은 값을 나타내었다. pH는 열풍건조시료의 pH가 동결건조시료에 비해 약간 높은 값을 나타내었으나 큰 차이는 보이지 않았다. 총 폴리페놀 함량 및 안토시아닌 함량은 동결건조시료에서 더 높은 함량을 나타내었다. 항산화 활성 측정 결과 라디칼 소거능의 경우, DPPH 및 ABTS 라디칼 소거능이 열풍건조시료에 비해 동결건조시료에서 비교적 우수한 활성을 나타내었다. 반면, 환원력으로 측정한 항산화 활성의 경우, reducing power 및 FRAP 값이 동결건조시료에 비해 열풍건조시료에서 높은 활성을 나타내었으나 수치상으로 큰 차이를 보이지는 않았다. 이상의 결과에서 건조방법에 따른 항산화 성분과 항산화 활성을 비교한 결과 열풍건조시료에 비해 동결건조 시료가 더 우수한 것으로 사료된다.

Keywords

References

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