Study on Estimation of Water Content by Heat Treatment and Hygroscopicity Behavior of Treated Starch Samples

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  • 熱条件の違いによる各種澱粉の水分量と吸湿性の変化
  • ユシトカネツショリニヨルデンプンノトクシツヘンカトテンオウンシュ、ユシシュ、カネツオンドトノソウゴカンケイ

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Abstract

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The water content of five species starches (corn, sweet potato, rice and tapioca) was estimated with different heat treatment method (60℃-5h, 105℃-4h, 135℃-1h, 150℃-1h). As a result, the best heat treatment to estimation is proved to treatment at 135℃ for 1h. Hygroscopicity behavior of heated starch samples (150℃-1h) was observed under different humidity condition. Under 100% humidity, the potato sample absorbed water 35% to dry matter, but the other samples absorbed 25-27%. However, under 52% humidity, all samples absorbed 13-14%. The iodine color reaction of the samples showed little change after heat treatment.

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