Univ. Grenoble Alpes, CNRS, Grenoble INP, LRP, 38000 Grenoble, France.
Univ. Grenoble Alpes, CNRS, CERMAV, F-38000 Grenoble, France.
Carbohydr Polym. 2023 Jan 1;299:120166. doi: 10.1016/j.carbpol.2022.120166. Epub 2022 Sep 28.
The salt sensitivity and selectivity feature of α-carrageenan (α-Car) were investigated and compared with κ-carrageenan (κ-Car) and iota-carrageenan (ι-Car). These carrageenans are identified by one sulfate group on the 3,6-anhydro-D-galactose (DA) for α-Car, D-galactose (G) for κ-Car and on both carrabiose moieties (G and DA) for ι-Car. The viscosity and temperature, where order-disorder transition have been observed, were greater in presence of CaCl for α-Car and ι-Car compared with KCl and NaCl. Conversely, the reactivity of κ-Car systems were greater in presence of KCl than CaCl. Unlike κ-Car systems, the gelation of α-Car in presence of KCl was observed without syneresis. Thus, the position of sulfate group on the carrabiose determines the importance of counterion valency too. The α-Car could be a good alternative to κ-Car to reduce the syneresis effects.
研究了α-卡拉胶（α-Car）的盐敏性和选择性特征，并与κ-卡拉胶（κ-Car）和ι-卡拉胶（ι-Car）进行了比较。这些卡拉胶通过 3,6-脱水-D-半乳糖（DA）上的一个硫酸根基团来鉴定α-Car，通过 D-半乳糖（G）来鉴定κ-Car，通过卡拉胶双糖部分（G 和 DA）来鉴定 ι-Car。在存在 CaCl 的情况下，α-Car 和 ι-Car 的粘度和温度观察到有序-无序转变，比 KCl 和 NaCl 更大。相反，κ-Car 体系在存在 KCl 时的反应性大于 CaCl。与 κ-Car 体系不同，在 KCl 存在下观察到 α-Car 凝胶化而没有离浆。因此，硫酸根基团在卡拉胶双糖上的位置也决定了抗衡离子价的重要性。α-Car 可以替代 κ-Car 来减少离浆效应。
