回転粘度計による熱帯産澱粉糊液の流動特性

DOI 日本農学文献記事索引 Web Site 被引用文献1件 参考文献30件

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  • Flow Behaviors of Tropical Starch Pastes as Measured by a Rotational Viscometer
  • カイテン ネンドケイ ニ ヨル ネッタイサン デンプン コエキ ノ リュウドウ

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The flow behaviors (i.e., shear thinning flow, thixotropy, yield value and apparent activation energy) of tropical starch pastes were studied by a rotational viscometer using potato and corn starches as controls. Each flow curve could be described by a power-law equation: τ=K γn, and viscosity index (K) and flow behavior index (n) were calculated. The n of cassava and sago pastes and arrowroot paste at 4% was similar to that of potato starch pastes. On the other hand, the n of edible canna pastes and arrowroot at 2 and 3% was similar to that of corn starch pastes. Starches, the n of which was represented by that of potato starch paste, consisted of both amylose and amylopectin with relatively large molecular weights. On the other hand, starches, the n of which was represented by that of corn starch paste, consisted of both amylose and amylopectin with relatively small molecular weights. Thixotropy was found with edible canna, cassava and sago pastes and 4% arrowroot paste between 10 and 60°C. Potato and cassava starch pastes, which consisted of both amylose and amylopectin with relatively large molecular weights, showed large thixotropy. Edible canna, arrowroot and corn starch pastes, which consisted of amylose and amylopectin with a combination of small and intermediate molecular weights, showed relatively small thixotopy. Sago starch was out of course with n and thixotropy. Yield values were found with 4% arrowroot starch paste at 10 and 20°C and corn starch pastes at 3 and 4% from 10 to 60°C. The apparent activation energy ranged between 8.5 and 17 kJ mol-1 for the six varieties of starches.

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