Batista Rejane A, Espitia Paula J P, Vergne Daviane M C, Vicente António A, Pereira Paula A C, Cerqueira Miguel A, Teixeira José A, Jovanovic Jelena, Severino Patricia, Souto Eliana B, Cardoso Juliana C
Post-Graduating Program in Biotechnology, Tiradentes University (UNIT), Av. Murilo Dantas, 300, Farolândia, Aracaju 49032-490, Brazil.
Institute of Technology and Research of Sergipe (ITPS)-Rua Campo do Brito, 371-Bairro São José-CEP, Aracaju 49020-380, Brazil.
Polymers (Basel). 2020 Sep 23;12(10):2173. doi: 10.3390/polym12102173.
Superabsorbent hydrogels (SAHs) are three dimensional networks formed by polymers that can absorb aqueous solution of over 100% of their initial weight. This work aimed to develop and characterize SAHs of Chitosan/Xanthan gum (CG), Chitosan/Alginate (CA) and controlled Chitosan (C), Xanthan gum (G), and Alginate (A) produced using "onion-like" methodology. The swelling performance, the morphological structure, the crystallinity, and the Fourier transformed infrared spectroscopy characteristics of SAH were used for the characterization of polyelectrolytes complex. Swelling analysis showed that chitosan has a strong influence on the maintenance of hydrogels structure after swelling, mainly in the acid environment (pH = 2). The chitosan hydrogel presented around 3000% of acidic fluid absorption after 24 h. The chitosan:xanthan gum (1:1 and 2:1 named as C1G1 and C2G1, respectively) hydrogels were the best combination regarding swelling performance in an acid environment, reaching 1665% and 2024%, respectively, as well at pH 7.0, presenting 1005% (C1G1) and 667% (C2G1). Scanning electron microscopy analysis showed samples with pores, and with different shapes. The X-ray diffraction showed the presence of a characteristic peak at 2θ = 20° in all developed composition because of the crystalline nature of chitosan. This work shows the possibility of developing eco-friendly biopolymer-based SAHs at a low cost with a good swelling capacity and stability.
高吸水性水凝胶（SAHs）是由聚合物形成的三维网络，能够吸收超过其初始重量100%的水溶液。这项工作旨在开发并表征采用“洋葱状”方法制备的壳聚糖/黄原胶（CG）、壳聚糖/藻酸盐（CA）以及对照壳聚糖（C）、黄原胶（G）和藻酸盐（A）的高吸水性水凝胶。利用高吸水性水凝胶的溶胀性能、形态结构、结晶度和傅里叶变换红外光谱特征来表征聚电解质复合物。溶胀分析表明，壳聚糖对溶胀后水凝胶结构的维持有很大影响，主要是在酸性环境（pH = 2）中。壳聚糖水凝胶在24小时后呈现出约3000%的酸性液体吸收量。壳聚糖:黄原胶（1:1和2:1，分别命名为C1G1和C2G1）水凝胶在酸性环境中的溶胀性能方面是最佳组合，分别达到1665%和2024%，在pH 7.0时，分别呈现1005%（C1G1）和667%（C2G1）。扫描电子显微镜分析显示样品有孔隙且形状各异。X射线衍射表明，由于壳聚糖的结晶性质，在所有制备的组合物中2θ = 20°处均存在特征峰。这项工作表明了以低成本开发具有良好溶胀能力和稳定性的环保型生物聚合物基高吸水性水凝胶的可能性。
