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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Quantitative Changes of Hydroxycinnamic Acid Derivatives and Anthocyanin in Corn (Zea mays L.) According to Cultivars and Heat Processes

옥수수의 품종별 및 가공별 Hydroxycinnamic Acid 유도체 및 Anthocyanin 색소의 함량 변화

  • Yu, Myeong-Hwa (Dept. Food Science and Nutrition, Catholic University of Daegu) ;
  • Kim, Eun-Ok (Dept. Food Science and Nutrition, Catholic University of Daegu) ;
  • Choi, Sang-Won (Dept. Food Science and Nutrition, Catholic University of Daegu)
  • 유명화 (대구가톨릭대학교 식품영양학과) ;
  • 김은옥 (대구가톨릭대학교 식품영양학과) ;
  • 최상원 (대구가톨릭대학교 식품영양학과)
  • Received : 2010.03.10
  • Accepted : 2010.04.08
  • Published : 2010.06.30
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Abstract

Hydroxycinnamic acid derivatives (HADs) and anthocyanins in corn (Zea mays L.) have recently been reported to have anticarcinogenic, anti-hypertensive, antidiabetic, antifungal, antioxidant, and anti-melanogenic activities. Five HADs and anthocyanins in corn were quantified by HPLC according to cultivars and heat processes. In addition, major anthocyanin of a black waxy corn was isolated and identified by several instrumental analysis, and its content was also quantified by HPLC according to heat processes. Of the ten corn cultivars, five waxy corn cultivars had moderate five HADs contents except "Baksa" waxy corn with higher two free cinnamic acids (FCAs), p-coumaric and ferulic acids. In contrast, three dent corn cultivars contained higher levels of three polyamine conjugates (PCs), CFP, DCP and DFP, and especially "P3394" had the highest amount of the three PCs. Two sweet corn cultivars had generally intermediate HADs levels between waxy and dent corn cultivars. Of the three colored-waxy corns, a black Mibaek waxy corn had the highest anthocyanin content. During heat processes, levels of two FCAs in the black waxy corn generally increased, whereas no significant change on three PCs contents was observed except the puffing process. Roasting, retort and puffing processes significantly increased two FCAs and especially, the puffed black waxy corn had the highest amount of FCAs. Meanwhile, most heat treatments except retort process, considerably decreased total anthocyanin contents, and especially the puffed black waxy corn had nearly no anthocyanin. Level of one major anthocyanin, pelargonidin 3-glucoside (P3G) isolated from a black waxy corn was appreciably decreased by heat treatments except retort process, which greatly increased P3G content. These results suggest that the retorted black waxy corn may be a promising high quality functional corn product.

옥수수를 이용한 고품질의 가공식품을 개발하기 위한 연구의 일환으로 옥수수의 품종별 및 가열처리에 따른 기능성 폴리페놀화합물인 hydroxycinnamic acid derivatives(HADs) 및 안토시아닌 색소의 함량 변화를 조사하였다. 국내산 3가지 옥수수 품종(찰옥수수, 감미옥수수 및 사료용 옥수수)의 일반성분 함량을 측정한 결과, 수분함량은 4.13~10.07%, 무질소화합물 65.57~81.75%, 단백질 6.51~15.15%, 지방 3.16~12.35%, 섬유소 2.09~7.81%, 회분 1.40~1.96% 범위로, 찰옥수수의 일반성분의 함량은 비슷하였으나 감미종 옥수수는 찰옥수수보다 단백질과 지방 함량이 높은 반면, 당 함량은 낮았으며, 특히 감미종 중 감미옥 품종은 지방과 섬유소 함량이 옥수수 품종 중 가장 높은 함량을 나타내었고, 사료용 옥수수는 단백질 및 지방 함량이 매우 낮았으며, 특히 단백질 함량은 옥수수 품종 중 가장 낮았다. 옥수수 품종 중 찰옥수수는 5가지 HADs 함량이 골고루 분포하고 있는 반면, 사료용 옥수수는 2가지 FCAs의 함량은 낮은 반면, 3가지 PCs 함량이 가장 높았으며, 특히 P3394 품종이 가장 높았다. 감미 옥수수는 찰옥수수보다 FCAs의 함량은 대체로 높은 반면, PCs는 사료용보다 적어 대체로 찰옥수수와 사료용 옥수수의 중간 정도의 HADs 함량을 나타내었다. 찰옥수수 품종 중 박사찰옥수수의 총 안토시아닌 색소 함량은 2.03 mg/g(건물중), 알록이찰옥수수는 3.43 mg/g, 그리고 흑찰옥수수의 함량은 4.35 mg/g으로서 흑미백찰옥수수의 총 안토시아닌 색소 함량이 가장 높았다. 가열처리에 따라 흑찰옥수수의 2가지 FCAs는 다소 증가한 반면, 3가지 PCs는 거의 변화가 없었으며, 가열처리 중 볶음, retort 및 팽화처리는 FCAs를 증가시켰고 특히 팽화처리 시 크게 증가하였다. 가열처리에 따른 흑찰옥수수의 총 안토시아닌 색소 함량을 측정한 결과, 대조구 함량은 4.35 mg/g이었으나 retort 처리(4.45 mg/g) 경우를 제외하고 대부분 가열처리에 따라 함량이 감소하는 경향을 나타내었으며, 특히 팽화처리 경우 안토시아닌 함량이 크게 감소하여 거의 소실되었다. 흑미백찰옥수수로부터 주된 안토시아닌 색소인 pelargonidin 3-glucoside(P3G)를 분리 및 동정하였으며, 가열처리에 따른 P3G의 함량 변화를 측정한 결과, retort 처리 경우 함량이 다소 증가한(20.03 mg%) 반면, 그 외 볶음, 마이크로파 및 압출성형 처리에 의해 대체로 감소하였으며, 특히 팽화처리 경우 색소가 거의 소실되었다. 이러한 결과를 종합해 볼 때 옥수수의 기능성성분인 HADs 및 안토시아닌 색소 함량은 옥수수 품종 및 가공처리에 따라 다소 달라짐을 알 수 있었으며, 특히 옥수수 품종 중 항암, 항고혈압, 항당뇨 및 항노화성 FCAs 및 안토시아닌 색소 함량이 높은 흑찰옥수수의 대량 보급과 더불어 고압가열처리(retort)에 의한 고품질의 흑찰옥수수 가공품 개발이 요구된다.

Keywords

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