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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Chemical Compositions and Antioxidant Activities of Leaves and Stalks from Different Sweet Potato Cultivars

고구마 품종별 잎과 잎자루의 성분특성과 항산화활성

  • Li, Meishan (Dept. of Food Science and Technology, Chungbuk National University) ;
  • Jang, Gwi Yeong (Dept. of Food Science and Technology, Chungbuk National University) ;
  • Lee, Sang Hoon (Dept. of Food Science and Technology, Chungbuk National University) ;
  • Woo, Koan Sik (Dept. of Functional Crop, National Institute of Crop Science) ;
  • Sin, Hyun Man (Dept. Crop Science, Chungbuk Agricultural Research and Extension Service) ;
  • Kim, Hong Sig (Dept. of Crop Science, Chungbuk National University) ;
  • Lee, Junsoo (Dept. of Food Science and Technology, Chungbuk National University) ;
  • Jeong, Heon Sang (Dept. of Food Science and Technology, Chungbuk National University)
  • Received : 2012.08.16
  • Accepted : 2012.09.25
  • Published : 2012.12.31
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Abstract

This study was conducted to evaluate the vegetative value of sweet potato leaves and stalks by investigating their chemical composition and antioxidant activity. The major minerals were found to be Ca and K. The crude protein content of the leaves ranged from 15.57% in Geonpungmi to 20.34% in Yeonhwangmi, while that of stalks was between 3.71% in Yulmi and 5.97% in Sinchunmi. The total phenolics and flavonoids content of the leaves were about 3.0~4.0 times higher than those of stalks. The levels of polyphenols and flavonoids were high in Geonpungmi leaf and in Sinchunmi stalk. ABTS radical activities were high in Geonpungmi leaf (58.75 mg AA eq/g) and in Daeyumi stalk (14.95 mg AA eq/g). DPPH radical scavenging was high in Geonpungmi and Jeungmi leaves ($IC_{50}$, 0.11 mg/mL) and in Sinchunmi stalk ($IC_{50}$, 1.09 mg/mL).

고구마 잎과 잎자루에 대한 식품소재로서의 활용 가능성을 알아보기 위하여 14 품종의 고구마에 대한 일반성분, 무기질 및 항산화활성에 대해 조사하였다. 무기질 함량은 K과 Ca 함량이 가장 높았으며, 단백질 함량은 잎에서 15.57~20.34% 범위로 연황미 가장 높게 나타났고 잎자루에서는 3.71~5.97% 범위로 신천미에서 가장 높게 나타났다. 잎의 총 폴리페놀 함량과 플라보노이드 함량은 각각 46.26~85.10 mg/g 및 40.25~68.37 mg/g 범위로 건풍미에서 가장 높았으며, 잎자루는 각각 14.60~37.93 mg/g 및 10.18~22.48 mg/g으로 신천미에서 가장 높았다. DPPH 라디칼 소거활성은 잎의 경우 건풍미와 증미에서 $IC_{50}$값이 0.109 mg/mL로 가장 높았으며, 잎자루는 신천미가 0.448 mg/mL로 가장 높았다. 총 항산화력은 잎의 경우 건풍미가 58.75 mg AA eq/g으로 가장 높았고 잎자루는 대유미가 14.95 mg AA eq/g으로 가장 높았다. 이상의 결과로부터 고구마 잎이 잎자루보다 항산화활성 뿐만 아니라 단백질함량과 무기질함량이 풍부해 식품소재로써 활용가능성이 높을 것으로 판단된다.

Keywords

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