Bittolo Bon Silvia, Libera Valeria, Ceccarini Maria Rachele, Malaspina Rocco, Codini Michela, Valentini Luca
Dipartimento di Fisica e Geologia, Università degli Studi di Perugia, Via A. Pascoli, 06123 Perugia, Italy.
Department of Pharmaceutical Science, University of Perugia, 06123 Perugia, Italy.
Polymers (Basel). 2024 Aug 7;16(16):2244. doi: 10.3390/polym16162244.
In this study, we report the preparation and characterization of water-stable films with UV-shielding and good mechanical properties, exploiting the synergistic effect of regenerated silk fibroin and bamboo-derived cellulose. Silk fibroin (SF)/bamboo (B) hybrid films are achieved by solubilizing both silk and bamboo fibers in formic acid with added CaCl. Infrared spectroscopy indicates that SF, when combined with bamboo, undergoes a conformational transition, providing evidence of an increase in SF crystallinity. Exploiting the intrinsic absorption of SF in the ultraviolet region, UV-Vis spectroscopy was used to assess the glass transition temperature (T) of SF/B films, showing a decrease in T by increasing the SF content. The addition of 10 wt% SF to the B matrix improved the elastic modulus by about 10% while conserving the strain at break with respect to the neat B films, increasing the UV shielding properties, while water absorption suggested the material's hydrophilic and swelling capacity even after one month. The hybrid films showed, under solar irradiation, a photoprotective behavior on keratinocyte human cells by increasing cellular viability. These findings may find potential applications in functional fabrics.
在本研究中，我们利用再生丝素蛋白和竹源纤维素的协同效应，报道了具有紫外线屏蔽性能和良好机械性能的水稳定薄膜的制备与表征。通过将丝纤维和竹纤维溶解在添加了氯化钙的甲酸中，制得丝素蛋白（SF）/竹（B）混合薄膜。红外光谱表明，SF与竹子结合时会发生构象转变，这为SF结晶度的增加提供了证据。利用SF在紫外区域的固有吸收，通过紫外可见光谱评估了SF/B薄膜的玻璃化转变温度（Tg），结果表明随着SF含量的增加，Tg降低。在B基质中添加10 wt%的SF，相对于纯B薄膜，弹性模量提高了约10%，同时保持了断裂应变，增强了紫外线屏蔽性能，而吸水率表明即使经过一个月，该材料仍具有亲水性和膨胀能力。在太阳辐射下，混合薄膜通过提高细胞活力，对人角质形成细胞表现出光保护作用。这些发现可能在功能性织物中找到潜在应用。
