Helical structures and water vapor sorption properties of carrageenan membranes derived from red algae
Helical structures and water vapor sorption properties of carrageenan membranes derived from red algae
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DOI：
10.1016/j.carpta.2022.100200
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发表时间：
2022-03-23
影响因子：
5.5
通讯作者：
Nagai, Kazukiyo
中科院分区：
文献类型：
--
作者：
Hirota, Natsumi;Nagai, Kazukiyo
用石油制造的包装是稳定的，其废物威胁海洋生物。这项研究建议使用从海洋植物中生产的无害食用材料。角叉菜胶是从红藻中提取的天然多糖。在25 ℃下研究了κ-角叉菜胶、ι-角叉菜胶和葡-角叉菜胶的膜样品的水蒸气吸附。κ-卡拉胶和ι-卡拉胶显示双螺旋结构，而β-卡拉胶显示单螺旋结构。在液态水的溶解度试验中，κ-卡拉胶和ι-卡拉胶溶胀，并且在23 ℃下，κ-卡拉胶溶解在水中。然而，这些高阶结构保持后，水蒸气暴露于相对压力为0.9。角叉菜胶膜中的水蒸气吸附性能与相对压力有关，并分为三个相对压力范围，即0.0至0.3、0.3至0.6和0.6至0.9。吸附在膜中的水分子的量与每个角叉菜胶中的极性基团的数量从0.0到0.3相关。从0.3开始，水分子团开始出现，并保持螺旋结构。这一新的发现可能会导致环境友好的包装设计使用卡拉胶。
Packaging manufactured from petroleum is stable, and its waste threatens marine life. This study proposes the use of harmless edible materials manufactured from marine plants. Carrageenan is among the natural polysaccharides derived from red algae. Water vapor sorption was studied for membrane specimens of kappa-carrageenan, iota-carrageenan, and lambda-carrageenan at 25 degrees C. kappa-Carrageenan and iota-carrageenan showed double-helical structure, whereas lambda-carrageenan exhibited a single-helical structure. In the solubility test of liquid water, kappa-carrageenan and iota-carrageenan were swollen, and lambda-carrageenan dissolved in water at 23 degrees C. However, these higher-order structures were maintained after the exposure of water vapor to a relative pressure of 0.9. The water vapor sorption properties in carrageenan membranes were related to the relative pressure and categorized into three relative pressure ranges, namely, from 0.0 to 0.3, from 0.3 to 0.6, and from 0.6 to 0.9. The amounts of water molecules sorbed in the membrane were correlated with the number of polar groups in each carrageenan from 0.0 to 0.3. From 0.3, the cluster of water molecules started to appear with the maintenance of the helical structures. This novel finding can potentially lead to the design of environmentally friendly packaging by using carrageenan.