Effect of the Degree of Crushing on the Extraction of Soluble Sugars and Starch from Rice Straw

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  • SUNAGA Kaoruko
    Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • MOTOBAYASHI Takashi
    Institute of Agriculture, Tokyo University of Agriculture and Technology
  • HIRASAWA Tadashi
    Institute of Agriculture, Tokyo University of Agriculture and Technology
  • OOKAWA Taiichiro
    Institute of Agriculture, Tokyo University of Agriculture and Technology
  • CHOSA Tadashi
    Institute of Agriculture, Tokyo University of Agriculture and Technology
  • TOJO Seishu
    Institute of Agriculture, Tokyo University of Agriculture and Technology

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Other Title
  • 粉砕程度が稲わら含有デンプンおよび可溶性糖の抽出に及ぼす影響
  • フンサイ テイド ガ イナワラ ガンユウ デンプン オヨビ カヨウセイ トウ ノ チュウシュツ ニ オヨボス エイキョウ

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The characteristics of crashed rice and the correlation between the effect of saccharifi cation fermentation and the degree of crashing were investigated using the rice forage cultivar 'Leaf-Star' to establish an effi cient utilization of starch in the whole crop rice for bio-ethanol. Then, the crushing energy and the energy from the crushed materials were examined. The degrees of crushing of separated organ samples, i.e., head, stem, leaf, and a mixed sample, were compared using the same crushing conditions. The small sizes of the relative particle mass of the mixed sample were larger than those of the separated organ samples. Therefore, the use of a mixed organ sample was considered to be an effective way to obtain a smaller relative particle mass size. The effect on the extracted amount of soluble sugars and starch due to differences in the degree of crushing of the samples were investigated. The extracted amount of soluble sugars was the same despite differences in the degree of crushing. There was high correlation between the extracted amount of starch and a crushed particle size of 50 - 100μm. The total amount of the extracted soluble sugars and starch, was affected by the difference in the degree of crushing of the material sample. If we assume the maximum extracted amount can be obtained when using particles less than 100μm in size, the extracted amount was 88% for a mean particle size of 232μm under a rough crushing condition. A comparison of the crushing energy and the energy from crushed materials indicated that rough crushing was most effective for extracting soluble sugars and starch.

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