ポテトアミロペクチンのレオロジー特性 Rheological Characteristics of Potato Amylopectin

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Author(s)

    • 田幸 正邦 TAKO Masakuni
    • 琉球大学農学部生物資源科学科 Department of Bioscience and Biotechnology, Faculty of Agriculture, University of the Ryukyus

Abstract

平均重合度(DPn),平均鎖長(CLn),およびリン酸含量がそれぞれ4290,23.0,および840ppmのポテトアミロペクチン(ジャガキッズ,90,赤)水溶液の非ニュートン流動と動的粘弾性をレオゴニオメーターを使用して測定した.ポテトアミロペクチンは2.0および4.0%で擬塑性流動を,6 .0%では降伏値(0.8Pa)が認められ塑性流動を示した.この結果から,ポテトアミロペクチン分子鎖は水溶液で二次結合を形成しないことが示唆された.粘性は温度の上昇に伴って徐々に減少した.また,動的弾性率は濃度の増大に伴って高い値を有したが,温度の上昇に伴って減少した.一方,tanδ は6.0%低温側(0℃)で1.15であった.動的弾性率は尿素(4.0M)またはアルカリ溶液(0.05または0.10NNaOH)で低い値に留まった.しかしながら,85%DMSO溶液では逆に増大した.ポテトアミロペクチン分子鎖に置換しているリン酸(C-6,613ppm)が,分子鎖内二次結合を阻害することが示唆された.

The non-Newtonian behavior and dynamic viscoelasticity in aqueous solution of potato amylopectin were measured with a rheogoniometer, and the molecular origin for the rheological characteristics were discussed in comparison with those of rice amylopectin. The flow curves, at 25t, of potato amylopectin showed shear-thinning behavior at 2.0 and 4.0% concentration, but plastic behavior at 6.0%, the yield value of which was estimated to be 0.8 Pa. Although the dynamic viscoelasticity of rice amylopectin showed a constant value, it decreased in potato amylopectin solution when the temperature was increased. The tan s value was 1.15 at a concentration of 6.0% even at 0°C. The dynamic modulus decreased with the addition of urea (4.0 M) and in alkaline solution (0.05 N and 0.10 N NaOH) during an increase in the temperature. An increase of the dynamic modulus, however, was observed in 85% DMSO. A slight intramolecular association in potato amylopectin molecules seems to beinvolved in aqueous solution. The phosphate groups attached at C-6 seem to prevent intramolecular associations of potato amylopectin molecules in aqueous solution.

Journal

  • Journal of Applied Glycoscience

    Journal of Applied Glycoscience 45(4), 379-384, 1998-12-01

    The Japanese Society of Applied Glycoscience

References:  19

Codes

  • NII Article ID (NAID)
    10008258398
  • NII NACSIS-CAT ID (NCID)
    AN10453916
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    13403494
  • NDL Article ID
    4635663
  • NDL Source Classification
    ZP24(科学技術--化学・化学工業--糖・澱粉)
  • NDL Call No.
    Z17-15
  • Data Source
    CJP  NDL  J-STAGE  JASI 
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