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首页> 外文期刊>Phase Transitions >Molecular recognition during sol-gel and gel-sol transition of kappa-iota carrageenan mixtures
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Molecular recognition during sol-gel and gel-sol transition of kappa-iota carrageenan mixtures

机译：κ-碘角叉菜胶混合物的溶胶-凝胶和凝胶-溶胶转变过程中的分子识别

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Sol-gel and gel-sol phase transitions of kappa-iota (kappa-iota) carrageenan mixtures in two types of salts were studied using photon transmission technique. Here, KCl and CaCl2 were chosen as the proper salts for the carrageenan mixtures. Coil-to-double helix (c-h) and double helix-to-dimer (h-d) phase transitions of carrageenan mixtures in monovalent and bivalent cation solutions were studied upon heating and cooling by using photon transmission technique. Photon transmission intensity, It, was monitored against temperature to determine the (c-h) and (h-d) transition temperatures (T-ch and T-nd). Two distinct transition regions were observed in both heating and cooling of the carrageenan-bivatent CaCl2 salt system. At the first step of heating process dimers decompose into double helices by making (d-h) transition. At the high temperature region (h-c) transition takes place. Carrageenan-monovalent KCl salt system presented only (c-h) and (h-c) transitions upon cooling and heating processes. Transition temperatures at the heating and cooling processes were obtained. A hysteresis was observed between (h-c)-(c-h) and (d-h)-(h-d) transitions for the monovalent and bivalent cations respectively.
机译：利用光子透射技术研究了两种盐中κ-角叉菜胶混合物的溶胶-凝胶和凝胶-溶胶相变。在这里，选择KCl和CaCl2作为卡拉胶混合物的合适盐。利用光子透射技术研究了卡拉胶混合物在单价和二价阳离子溶液中的角叉菜胶混合物的线圈-双螺旋（c-h）和双螺旋-二聚体（h-d）的相变。相对于温度监测光子传输强度It，以确定（c-h）和（h-d）转变温度（T-ch和T-nd）。在加热和冷却角叉菜胶-有效CaCl 2盐系统中都观察到两个不同的过渡区域。在加热过程的第一步，二聚体通过（d-h）跃迁分解为双螺旋。在高温区域（h-c）发生转变。角叉菜胶一价KCl盐系统在冷却和加热过程中仅出现（c-h）和（h-c）转变。获得了加热和冷却过程中的转变温度。对于单价和二价阳离子，在（h-c）-（c-h）和（d-h）-（h-d）跃迁之间观察到滞后。

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