Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Difference of Starch Characteristics of Sweetpotato (Ipomoea batatas (L.) Lam) by Cultivated Regions

재배지역에 따른 고구마(Ipomoea batatas (L.) Lam) 품종의 전분 특성 차이

  • Han, Seon-Kyeong (Bioenergy Crop Research Center, National Institute of Crop Science, Rural Development Administration) ;
  • Song, Yeon-Sang (Bioenergy Crop Research Center, National Institute of Crop Science, Rural Development Administration) ;
  • Lee, Hyeong-Un (Bioenergy Crop Research Center, National Institute of Crop Science, Rural Development Administration) ;
  • Ahn, Seung-Hyun (Bioenergy Crop Research Center, National Institute of Crop Science, Rural Development Administration) ;
  • Yang, Jung-Wook (Bioenergy Crop Research Center, National Institute of Crop Science, Rural Development Administration) ;
  • Lee, Joon-Seol (Bioenergy Crop Research Center, National Institute of Crop Science, Rural Development Administration) ;
  • Chung, Mi-Nam (Bioenergy Crop Research Center, National Institute of Crop Science, Rural Development Administration) ;
  • Suh, Sae-Jung (International Technical Cooperation Center, Technology Cooperation Bureau, Rural Development Administration) ;
  • Park, Keun-Hyung (Department of Food Science & Technology, and Functional Food Research Center, Chonnam National University)
  • 한선경 (농촌진흥청 국립식량과학원 바이오에너지작물센터) ;
  • 송연상 (농촌진흥청 국립식량과학원 바이오에너지작물센터) ;
  • 이형운 (농촌진흥청 국립식량과학원 바이오에너지작물센터) ;
  • 안승현 (농촌진흥청 국립식량과학원 바이오에너지작물센터) ;
  • 양정욱 (농촌진흥청 국립식량과학원 바이오에너지작물센터) ;
  • 이준설 (농촌진흥청 국립식량과학원 바이오에너지작물센터) ;
  • 정미남 (농촌진흥청 국립식량과학원 바이오에너지작물센터) ;
  • 서세정 (농촌진흥청 기술협력국 국제기술협력과) ;
  • 박근형 (전남대학교 식품공학과 및 기능성식품연구센터)
  • Received : 2013.05.24
  • Accepted : 2013.09.25
  • Published : 2013.12.31
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Abstract

We investigated out the effect of cultivation region on the physicochemical characteristics of starch in six sweetpotato cultivars. The following sweetpotato cultivars were analyzed: Daeyumi, Shingeonmi, Jinhongmi, Shinyulmi, Yulmi, and Yeonhwangmi. Samples were cultivated in Muan, Iksan, Nonsan, Boryeong and Hamyang. The soil texture was found to be sandy loam in Muan, Iksan, and Boryeong, sandy clay loam in Nonsan, and loam in Hamyang. The starch content of the sweetpotato was higher in Muan than in Hamyang. The amylose content was 22.3-30.9%, and the highest amylose content was found in samples from Iksan. Rapid viscosity analysis showed that the samples from Hamyang had the lowest values of pasting temperature, while samples of the Daeyumi cultivar had the highest values. Thermal analysis with a differential scanning calorimeter showed that the Muan samples had the highest values of onset temperature, maximum peak temperature, and completion temperature, and the samples from Hamyang had the lowest values. There was no difference between the cultivation regions or the cultivar in the X-ray pattern of the starch or its appearance in scanning electron micrographs. Therefore, the results of this study confirm that cultivation region and cultivar play an important role in determining the quality of sweetpotato and the physicochemical characteristics of sweetpotato starch.

재배지역에 따른 고구마 전분의 특성을 구명하여 고구마의 새로운 식품산업 소재로서 활용 방안을 모색하기 위한 기초자료로 이용하고자 실험한 결과는 다음과 같다. 고구마 재배기간의 평균온도는 $16.7-28.2^{\circ}C$, 강수량은 882(무안)-1,682 mm(함양)로 함양지역의 강수량이 많았으며, 일조시간은 702.4(익산)-793.5 시간(무안)으로 무안지역이 많았다. 지역별 시험구의 토성은 무안, 익산, 보령지역은 사양토, 논산지역은 사질식양토, 함양지역은 양토였으며 pH는 5.5-6.2 범위였다. 재배지역에 따른 전분 함량은 29.4-59.20%, 아밀로스 함량은 22.3-30.9%의 범위를 보였고 전분 함량은 무안지역이, 아밀로스 함량은 익산지역에서 높았다. 고구마 전분의 수분함량은 9.80-15.60%, 단백질 함량은 0.02-0.07%, 조지방 함량은 0.05-0.28%, 회분 함량은 0.10-0.30%의 범위였고 단백질 함량은 익산지역이 높았다. 호화개시온도는 무안지역이 높고 함양지역이 낮았으며 최고, 최저, 최종점도, breakdown, setback은 함양지역이 높고 무안지역이 낮았다. To, $T_p$, $T_c$는 무안, 논산지역이 높고 함양지역이 낮았으나 ${\Delta}T$와 ${\Delta}H$는 함양지역이 높았다. 고구마의 회절각도는 $15.08^{\circ}-15.32^{\circ}$, $16.92^{\circ}-17.72^{\circ}$, $22.90^{\circ}-23.62^{\circ}$에서 강한 피크를 보여 전분의 결정화도 형태 중 C형에 속하였다. 고구마 전분의 입자 형태는 전 지역에서 대부분 둥글고 타원형모양을 하고 있었으며 일부 다각형의 입자 형태를 포함하고 있었다. 전분의 입도분포는 같은 품종이라도 재배지역에 따라 차이가 있었다. 평균입도는 12.07-28.32 ${\mu}m$의 범위로 무안지역이 작고 익산지역이 큰 경향이었다.

Keywords

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