Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Physicochemical Properties of Black Doraji (Platycodon grandiflorum)

흑도라지의 이화학적 품질특성

  • 이수진 (영남대학교 식품영양학과) ;
  • 신승렬 (대구한의대학교 한방식품조리영양학부) ;
  • 윤경영 (영남대학교 식품영양학과)
  • Received : 2013.04.10
  • Accepted : 2013.05.14
  • Published : 2013.08.31
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Abstract

The physicochemical properties of raw and black doraji were examined with the goal of increasing the utilization of doraji. Raw and Black doraji contained similar amounts of crude ash, crude fat, and crude protein, but raw doraji had higher level of fiber. Arginine was the major free amino acid in both types of doraji. Free sugar and organic acid contents of doraji increased after steaming heat treatment. Potassium was a prominent mineral in both raw and black doraji, constituting 85% of total minerals. Black doraji contained almost twice as much crude saponin as did raw doraji. Black doraji showed lower values of L (lightness), a (redness), and b (yellowness). The hardness and chewiness of raw doraji were higher than those of black doraji. Black dorai showed a higher amount and extraction rate of saponin, even though nutrient value of doraji slightly decreased after steaming heat treatment. Therefore, black doraji can be a valuable ingredient in functional foods.

본 연구는 다양한 생리활성을 지닌 도라지의 활용성을 증가 및 다양화시키기 위해 증숙을 통하여 흑도라지를 제조하고 품질특성을 측정하였다. 일반성분 중 수분함량은 흑도라지가 73.96%로 도라지에 비해 함량이 낮았으며, 조회분, 조지방 및 조단백질의 함량은 생도라지와 흑도라지의 함량이 유사하여 큰 변화는 보이지 않았다. 반면 흑도라지의 조섬유 함량은 생도라지에 비해 감소하였으며, 반면 탄수화물의 양은 증가하였다. 또한 유리당 및 유기산은 흑도라지가 생도라지에 비해 매우 높은 함량을 나타내었다. 유리아미노산 함량은 생도라지와 흑도라지 모두 arginine이 대부분을 차지하였고, 구성아미노산은 glutamic acid의 함량이 가장 높게 나타났으며, 유리 및 구성 아미노산의 총 함량은 생도라지에 비해 흑도라지의 함량이 낮게 측정되었다. 도라지의 주요 무기질은 칼륨, 칼슘 및 마그네슘으로 나타났으며, 구리를 제외한 대부분의 무기질은 생도라지가 흑도라지에 비해 다소 많은 함량을 나타내었으나 그 차이는 크지 않았다. 조사포닌의 함량은 흑도라지가 생도라지에 비해 약 2배 높은 함량을 나타내었으며, 흑도라지의 L, a 및 b 값은 생도라지에 비해 낮게 측정되어 증숙에 의한 갈변이 많이 진행됨을 알 수 있었다. Texture를 측정한 결과, hardness, chewiness 모두 흑도라지가 낮은 값을 나타냈다. 이상과 같이 흑도라지는 생도라지에 비해 영양성은 다소 감소하였지만 높은 사포닌 함량 및 유용성분 추출 용이성으로 기능성 식품소재로의 활용이 증가될 수 있을 것으로 판단된다.

Keywords

References

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