The effects of the sol-gel transition of alginates on effective charge densities.
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概要
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The counterion binding properties of alginate (Alg) sol and gel were studied by using the membrane potential method, in which membranes were constructed of an Alg layer sandwiched between supporting films. The concentrations of Alg <I>W</I><SUB>Alg</SUB> ranged from 0.0025 to 0.0063 g cm<SUP>−3</SUP>, and the membrane potentials were measured in NaCl, MgCl<SUB>2</SUB>, and CaCl<SUB>2</SUB> solutions. The effective charge densities of Alg (θ<SUP>*2</SUP>) were obtained by curve fittings with the theoretical values of the multimembrane potentials. The ratios of θ<SUP>*2</SUP> to the concentration of uronate units θ<SUB>0</SUB> were found not to depend on <I>W</I><SUB>Alg</SUB>; their mean values were 0.45, 0.28, and 0.12 for Na-, Mg-, and CaAlg. The results of Na- and MgAlg in the sol state were bigger than Manning's theoretical values. The much smaller values of CaAlg in the gel state than MgAlg in the sol state showed that the Ca ion binding was enhanced by the gellation not only in the junction, but also in the networks.
- 公益社団法人 日本化学会の論文
著者
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Yonese Masakatsu
Faculty Of Pharmaceutical Sciences Nagoya City University
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Kishimoto Hiroshi
Faculty Of Pharmaceutical Sciences Nagoya City University
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Baba Kazuhiko
Faculty of Pharmaceutical Sciences, Nagoya City University
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