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Effect of Processing Treatment on Physicochemical Characteristics of Brown Rice Varieties with Different Amylose Content

아밀로오스 함량이 다른 현미의 품종별 가공 처리에 따른 품질 특성 비교

  • Received : 2013.05.29
  • Accepted : 2013.07.30
  • Published : 2013.10.31

Abstract

The quality characteristics of brown rice polished with grains of four rice varieties (Hwaseonchal, Baegjinju, Ilpum and Goami) were examined. For the physical properties of native and fried brown rice starches, the gelatinization temperatures and enthalpies (determined with differential scanning calorimetry) of brown rice starches decreased with increasing amylose content. The pasting viscosities of native brown rice starches in distilled water were higher than those in $HgCl_2$ solution (as an ${\alpha}$-amylase inhibitor). The highest viscosity of gelatinized starch was observed for the starch of Ilpum rice variety relative to other varieties. Cystal packing arrangement of brown rice starches subjected to deep-fat frying converted A-type (typically observed for cereal starches) into V-type (formed by retrogradation and recrystllization of amylose molecules).

아밀로오스 함량의 차이가 있는 품종별 현미를 대상으로 frying 처리와 파보일링 처리를 통해 품질 특성을 조사하였다. 품종별 현미의 용융 흡열 곡선을 관찰한 결과 amylose 함량이 증가할수록 호화 엔탈피가 감소되는 경향이 관찰되었으며, amylograph 측정결과 현미 중 효소의 불활성화를 위해 $HgCl_2$ 처리와 전분입자의 팽윤정도에 따라 영향을 미치는 것을 확인할 수 있었다. Gelatinization temperature는 Ilpumbyeo가 가장 높은 것으로 나타났으며, Goami가 maximum viscosity와 breakdown 값이 가장 높은 수치를 보여주었다. X-선 회절도 분석 결과 일품벼 백미의 경우 결정형이 소실된 V형, 일품벼 현미의 경우 B형의 결정체에 가까운 것이 관찰되었다. 가공처리에 따른 주사전자현미경 측정결과 파보일링 처리 후 튀긴 경우 amylose 함량이 높을수록 표면이 둥근 형태를 띠는 것을 확인할 수 있었다. 또한, 수침 후 파보일링 처리 후 튀긴 경우가 수침처리만 한 후 튀긴 경우보다 전체적으로 강도와 경도 측정결과 더 높은 것을 확인 할 수 있었다.

Keywords

References

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