| Summary: | 碩士 === 國立臺灣大學 === 食品科技研究所 === 89 === The saponified polyacrylonitrile graft starch is considered as a potential water-retaining aid for its capability of adsorbing large amount of water. It’s widely used in agriculture, manufacturing industry, and pharmacy. Dextrin was used as basal material to study the effects of grafting on the capability of water adsorption. The followings were considered as major factors that affected the water adsorption properties of the product: initiator concentration(3.6×10-3、7.2×10-3、1.09×10-2 Ｍ), reaction time of graft copolymerization (5, 30, 60 min) and saponificiation time (15, 30, 45, 60 min). The following properties of the products were evaluated to study the effects of reaction factors: water adsorption after 3 and 15 min, nitrogen percentage and glucose percentage. The results showed that the products had the highest water adsorption rate as using initiator concentration at 7.2×10-3 M. The final water adsorption amount of the product reach a plateau, as initiator concentration were 1.09×10-2 M. A period of 30 minutes was sufficient for copolymerization reaction. Saponificiation was found to be the key reaction to generate the amount of hydrophilic groups (-COOH, -COONH2). As the saponification time increased, the water adsorption capability of product increased.
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