Effect of Different Milling Methods on Distribution of Particle Size of Rice Flours

제분방법이 쌀가루의 입자크기에 미치는 영향

  • Kum, Jun-Seok (Rice Utilization Research Center, Korea Food Research Institute) ;
  • Lee, Sang-Hyo (Rice Utilization Research Center, Korea Food Research Institute) ;
  • Lee, Hyun-Yu (Rice Utilization Research Center, Korea Food Research Institute) ;
  • Kim, Kil-Hwan (Rice Utilization Research Center, Korea Food Research Institute) ;
  • Kim, Young-In (Department of Home Economics, Sanggi University)
  • 금준석 (한국식품개발연구원 쌀이용연구센터) ;
  • 이상효 (한국식품개발연구원 쌀이용연구센터) ;
  • 이현유 (한국식품개발연구원 쌀이용연구센터) ;
  • 김길환 (한국식품개발연구원 쌀이용연구센터) ;
  • 김영인 (상지대학교 가정학과)
  • Published : 1993.10.01

Abstract

Two different methods (Sieve shaker, Elzone particle size analyzer) were used to investigate rice flour particle size obtained by various milling method. Results of Elzone particle size analyzer were more effective than Sieve shaker in determining particle size, and the distribution of particle size of rice flours was affected by the type of the milling methods used. A rice flour, prepared in a Pin mill had a particle size range of $60{\sim}500$ mesh, and 30.38% of the sample was in the particle size range $200{\sim}270$ mesh. A rice flour, prepared in a Colloid mill had a particle size range of $40{\sim}500$ mesh and more of flour particles appeared in the range $140{\sim}200$ mesh than any other particle size. A rice flour, prepared in a Micro mill had a particle size range of $140{\sim}500$ mesh, and 41.62% of the sample was in the particle size range over 500 mesh. A rife flour, prepared in a Jet mill had a finer flour particle size was over the particle size range 500 mesh. The finer rice flour gave the highest L value and the lowest a value. The wet-milled flour particles were observed as a cluster of starch granules and the particles of rice flour (dry-milling) were observed as fragment of rice grains. Scanning Electron Photomicrographs revealed that visual differences in structure between milling methods, and similar results with Elzone particle size analyzer method in particle size.