Physicochemical Properties of Starch Granules from Endosperm Mutants in Rice

배유돌연변이체 쌀전분의 이화학적 특성 비교

  • Kang, Mi-Young (Department of Home Economics, Kyungpook National University) ;
  • Han, Ji-Yeun (Department of Home Economics, Kyungpook National University) ;
  • Nam, Seok-Hyun (Division of Natural Science, Ajou University)
  • 강미영 (경북대학교 사범대학 가정교육과) ;
  • 한지연 (경북대학교 사범대학 가정교육과) ;
  • 남석현 (아주대학교 자연과학대학 기초과학부)
  • Published : 2000.04.30

Abstract

Starches from the eight varieties of rice were analyzed using scanning electron microscope(SEM), differential scanning calorimetry(DSC) and X-ray diffractometry, and tested on the starch-granule susceptibility to 15% $H_2SO_4$ and glucoamylase. The shape of starch granules from normal rice varieties and low-amylose mutants were polygonal while shrunken and floury mutants were globular. According to DSC, starches from Nampung CB243 showed higher onset temperature$(T_o)$, completion temperature$(T_c)$ and Punchilmi, Nampung EM90 showed higher enthalpy$({\triangle}H)$ of gelatinization than others. shr showed the highest hydrolysis rate to 15% $H_2SO_4$ while Nampung CB243 showed the lowest one. Eight varieties of rice starch granules showed A-type pattern on X-ray diffractograms. The lower amylose content rice varieties showed the higher hydrolysis rate treated with glucoamylase.

Keywords

endosperm mutant rice;amylose;X-ray diffractogram;glucoamylase