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Quality characteristics of Aronia melanocarpa by different drying method

건조방법에 따른 아로니아의 품질특성

  • Lee, Seul (Department of Food and Food-Service Industry, Kyungpook National University) ;
  • Kim, Jong-Kuk (Department of Food and Food-Service Industry, Kyungpook National University)
  • 이슬 (경북대학교 식품외식산업학과) ;
  • 김종국 (경북대학교 식품외식산업학과)
  • Received : 2014.11.25
  • Accepted : 2015.01.27
  • Published : 2015.02.28

Abstract

In this study, the quality characteristics of different drying methods of Aronia melanocarpa, which contains large amounts of bioactive substances, were investigated for the improvement of their practical use. During the drying period, the weight reduction was the highest with vacuum freeze drying (81.6%). The water content was reduced to the maximum level when vacuum freeze-drying was used. With regard to the color value measurement results, there were no significant differences in the $L^*$ value. Values of $a^*$ and $b^*$ were increased in vacuum freeze drying and cold air drying, but decreased in hot air drying. The hardness was increased dramatically after 36 hours of hot air drying, while with cold air drying, it increased slowly until 132 hr and increased rapidly after 132 hr. The dried yield was the highest with cold air drying (24.2%). As for the general component analysis results of Aronia melanocarpa, the moisture content was the lowest, and the crude protein and crude fat contents were the highest with vacuum freeze drying. No difference in pH value was shown among the dried Aronia melanocarpa obtained from the different drying methods, but the sugar content was the highest with vacuum freeze drying. The mineral content was the highest with cold air drying, and K, Ca, Mg, and Na were the major minerals. The free sugar content of dried Aronia melanocarpa was found to be 5.92~20.59 g/100 g, and the highest free sugar content was found with vaccum freeze drying.

아로니아의 활용성 제고를 위하여 건조방법에 따른 품질특성을 비교한 결과, 건조과정 중 중량변화율은 진공동결건조가 81.6%로 가장 많은 중량감소를 나타내었고, 수분함량은 진공동결건조에서 가장 많은 수분이 감소하였으며, 건조 후 최종 수분함량은 진공동결건조에서 0.99%로 가장 낮은 함량을 나타내었다. 색도 측정결과, $L^*$값은 건조방법에 따른 큰 차이를 나타내지 않았으며, $a^*$값과 $b^*$값은 진공동결건조와 냉풍건조에서 증가하였고, 열풍건조에서는 감소하였다. 경도는 열풍건조에서는 건조 36시간 이후 급격하게 증가하였고, 냉풍건조는 서서히 증가하다가 132시간 이후 급격하게 증가하는 모습을 보였다. 건조방법에 따른 품질특성으로 건조수율은 냉풍건조가 24.20%로 가장 높았으며, 열풍건조 20.40%, 진공동결건조 19.41% 순으로 나타났다. 일반성분은 생과에서 수분이 61.76%로 가장 높게 나타났으며, 조회분은 열풍건조에서 가장 높게 나타났고, 가용성무질소물, 조단백, 조지방은 진공동결건조에서 가장 높은 함량을 나타내었다. 건조방법에 따른 아로니아의 pH는 3.84~3.92로 큰 차이가 없었으며, 당도는 동결건조($6.57^{\circ}Brix$) > 열풍건조($5.37^{\circ}Brix$) > 냉풍건조($4.40^{\circ}Brix$) > 생과($1.07^{\circ}Brix$) 순으로 나타났다. 무기질 함량은 진공동결건조에서 가장 높았으며, 주요 무기질은 K, Ca, Mg, Na인 것으로 나타났다. 아로니아에 함유된 당은 fructose, glucose 두 종류인 것으로 나타났으며, 진공동결건조가 20.59 g/100 g으로 가장 높은 함량을 가진 것으로 나타났다.

Keywords

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