陽電子消滅寿命測定法および熱分析を用いた生体高分子ゲルの膨潤過程の解析

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  • Analysis of Swelling Process of Biopolymer Gel by Positron Annihilation Lifetime Measurement and Differential Scanning Calorimetry
  • ヨウデンシ ショウメツ ジュミョウ ソクテイホウ オヨビ ネツ ブンセキ オ モチイタ セイタイ コウブンシ ゲル ノ ボウジュンカテイ ノ カイセキ

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Interaction between biopolymer and water in swelling process of biopolymer gel was examined using positron annihilation lifetime spectroscopy (PALS) and differential scanning calorimetry (DSC) . Gelatin gels with different concentrations were used for biopolymer gel. To examine into water structure in gelatin gel, the weight percentages of bound water and free water against total water in gelatin gels were calculated from fusion enthalpy of DSC curves. Accompanied with increase of gelatin concentration, the percentage of bound water increased and the percentage of free water decreased. Since water structure change results from network structure of gelatin gel, free volume hole radii of gelatin gels with different concentrations were characterized with positron annihilation lifetime spectra using PATFIT-88 program. Free volume hole radius of dried gelatin was smaller than that of pure water, and free volume hole radius of gelatin gel increased with increase of water content approaching the value of pure water. It indicates that water molecules penetrate into helix structure of gelatin, and helix structure was stretched by water molecules in the swelling process. Therefore, water molecules were strongly bound to gelatin molecules at lower water content, but free water increased at higher water content as a result of stretch of helix structure.

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