Use of Dicarboxylic Acids To Improve and Diversify the Material Properties of Porous Chitosan Membranes

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• 作者：Po-Hui Chen ; Ting-Yun Kuo ; Fang-Hsuan Liu ; Ya-Hsi Hwang ; Ming-Hua Ho ; Da-Ming Wang ; Juin-Yih Lai ; Hsyue-Jen Hsieh
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2008
• 出版时间：October 8, 2008
• 年：2008
• 卷：56
• 期：19
• 页码：9015-9021
• 全文大小：416K
• 年卷期：v.56,no.19(October 8, 2008)
• ISSN：1520-5118

文摘

Several nontoxic dicarboxylic acid solutions (oxalic acid, succinic acid, malic acid, and adipic acid solutions) instead of an acetic acid solution were used as solvents for chitosan dissolution. The amount of free amino groups of the chitosan in the solution decreased due to the ionic cross-linking of the dicarboxylic acids with chitosan. These solutions were used to fabricate porous chitosan membranes. Replacing acetic acid with these dicarboxylic acids for membrane preparation improved the water uptake (by 35% at most), tensile strength (by 110% at most), and elongation capability (by 50% at most) of the membranes. These dicarboxylic acid solutions not only act as solvents but also improve the material properties of the chitosan membranes due to the ionic cross-linking and hydrogen bond formation. In brief, a nontoxic and straightforward cross-linking method has been developed for chitosan material; this method does not result in a brittle product, thus making it better than the use of toxic cross-linking reagents.