식미에 영향을 미치는 쌀 배유조성 지질성분특성 변이

Variation of Properties of Lipid Components in Rice Endosperm Affected on Palatability

  • 윤미라 (경북대학교 식품영양학과) ;
  • 고희종 (서울대학교 농업생명과학대학) ;
  • 강미영 (경북대학교 식품영양학과)
  • Yoon, Mi-Ra (Department of Food & Nutrition, Kyungpook National University) ;
  • Koh, Hee-Jong (Department of plant Science, Seoul National University) ;
  • Kang, Mi-Young (Department of Food & Nutrition, Kyungpook National University)
  • 발행 : 2008.09.30

초록

식미에서 차이를 보이는 고품벼와 팔공벼를 시료로하여 이들 쌀 배유에 함유되어 있는 지용성 물질들의 성분 특성과 식미치간의 상관성을 검정하고, 아울러 쌀가루 및 전분의 이화학적 특성과 지질성분 특성과의 연관성을 분석하였다 실험결과, 두 품종 쌀로부터 각각 배유에 함유되어 있는 전체 지방산들의 조성비는 두 품종간에 차이가 있으며 전분입자 내에서 아밀로오스와 복합체를 형성하는 것으로 알려져 있는 전분지질의 경우 고품이 팔공보다 불포화지방산의 함량비가 높았으며 식미와 연관성이 있을 가능성을 예상할 수 있었다. 식미가 좋은 고품은 식미가 나쁜 팔공에 비해서 스쿠알렌과 사이클로아테놀 함량이 높았고 곡류에 함유되어 있는 대표적인 식물성 스테롤류인 캠페스테롤, 스티그마스테롤, 시토스테를 등은 비슷한 함량을 보였다 또한 식미특성을 반영하는 지표라 할 수 있는 호화특성에서 고품은 팔공보다 쌀가루 및 전분의 호화개시온도가 낮았고 수화 초기 온도에서 쌀가루의 팽윤력이 높게 나타내어 쌀에 소량 함유된 지용성 성분들이 호화특성에 관여하고 있음을 알 수 있었다.

In order to understand the difference in rice eating quality, two rice varieties having different eating qualities were examined from the correlation between palatability score (Toyo value) and components of lipid in rice endosperm. We also analyzed the relationship between lipid properties and physicochemical characteristics of milled rice. Major fatty acids of milled rice starch-lipids, known to exist as inclusion complexes with amylose in starch granules, were palmitic (38.25% in Gopum and 39.75% in Palgong) and linoleic aicds (33.13% in Gopum and 31.93% in Palgong). In addition, the unsaturated fatty acid contents of rice endosperm showed a significant relationship with palatability. Plant sterols in two rice samples were identified, Gopumbyeo of good eating quality had high contents of squlaene and cycloartenol and similar contents of campesterol, stigmasterol and sitosterol. There were significant differences in pasting properties of rice flours and starches between the two cultivars. These results suggested that rice lipids impact on pasting properties after cooking, subsequently relating to palatability.

키워드

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