School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China.
Molecules. 2022 Jul 22;27(15):4686. doi: 10.3390/molecules27154686.
In this study, a polysaccharide-based hydrogel microsphere (SFP/SA) was prepared using S. fusiforme polysaccharide (SFP) and sodium alginate (SA). Fourier transform infrared spectroscopy (FT-IR) demonstrated that SFP was effectively loaded onto the hydrogel microsphere. Texture profile analysis (TPA) and differential scanning calorimetry (DSC) showed that, with the increase of SFP concentration, the hardness of SFP/SA decreased, while the springiness and cohesiveness of SFP/SA increased, and the thermal stability of SFP/SA improved. The equilibrium adsorption capacity of SFP/SA increased from 8.20 mg/g (without SFP) to 67.95 mg/g (SFP accounted 80%) without swelling, and from 35.05 mg/g (without SFP) to 81.98 mg/g (SFP accounted 80%) after 24 h swelling. The adsorption of crystal violet (CV) dye by SFP/SA followed pseudo-first order and pseudo-second order kinetics (both with R2 > 0.99). The diffusion of intraparticle in CV dye was not the only influencing factor. Moreover, the adsorption of CV dye for SFP/SA (SFP accounted 60%) fit the Langmuir and Temkin isotherm models. SFP/SA exhibited good regenerative adsorption capacity. Its adsorption rate remained at > 97% at the 10th consecutive cycle while SFP accounted for 80%. The results showed that the addition of Sargassum fusiforme polysaccharide could increase the springiness, cohesiveness and thermal stability of the hydrogel microsphere, as well as improve the adsorption capacity of crystal violet dye.
在这项研究中，使用 S. fusiforme 多糖（SFP）和海藻酸钠（SA）制备了一种多糖基水凝胶微球（SFP/SA）。傅里叶变换红外光谱（FT-IR）表明 SFP 有效地负载到水凝胶微球上。质地分析（TPA）和差示扫描量热法（DSC）表明，随着 SFP 浓度的增加，SFP/SA 的硬度降低，而 SFP/SA 的弹性和内聚性增加，SFP/SA 的热稳定性提高。SFP/SA 的平衡吸附容量从 8.20 mg/g（无 SFP）增加到 67.95 mg/g（SFP 占 80%）而不溶胀，从 35.05 mg/g（无 SFP）增加到 81.98 mg/g（SFP 占 80%）24 小时后溶胀。SFP/SA 对结晶紫（CV）染料的吸附符合伪一级和伪二级动力学（均 R2 > 0.99）。CV 染料在颗粒内的扩散不是唯一的影响因素。此外，SFP/SA（SFP 占 60%）对 CV 染料的吸附符合 Langmuir 和 Temkin 等温模型。SFP/SA 表现出良好的再生吸附能力。在第 10 个连续循环中，其吸附率保持在 > 97%，而 SFP 占 80%。结果表明，添加 Sargassum fusiforme 多糖可以提高水凝胶微球的弹性、内聚性和热稳定性，同时提高结晶紫染料的吸附能力。
