Department of Molecular Sciences and Nanosystems, Università Ca' Foscari di Venezia, Via Torino 155, 30172 Venezia Mestre, Italy.
Dipartimento di Scienze Chimiche, Università di Padova, via Marzolo 1, 35131 Padova, Italy.
ACS Appl Mater Interfaces. 2022 Aug 3;14(30):35148-35156. doi: 10.1021/acsami.2c11749. Epub 2022 Jul 25.
The fish industry produces every year huge amounts of waste that represent an underutilized source of chemical richness. In this contribution, type I collagen was extracted from the scales of and carbon dots (CDs) were synthesized from the scales of These materials were combined to make hybrid films with UV-blocking ability, by casting a mixture of gelatin, glycerol (15%), and CDs (0, 1, 3, and 5%). The films were fully characterized from the mechanical, morphological, and optical point of view. Here, 40 μm thick films were obtained, characterized by a high water solubility (70%); moreover, the presence of CDs improved the film mechanical properties, in particular increasing the tensile strength (TS) up to 17 MPa and elongation at break (EAB) up to 40%. The CDs also modulated water vapor permeability and the thermal stability of the films. From the optical point of view, with just 5% loading of CDs the films blocked almost 70% of the UV radiation with negligible change in transparency (88.6% for the nonloaded vs 84.4% for 5% CDs) and opacity (1.32 for nonloaded vs 1.61 for 5% CDs). These types of hybrid biobased films hold promise for the production of sustainable UV-shields both for human health and for prolonging the shelf life of food.
鱼类产业每年都会产生大量的废弃物，这些废弃物是一种未充分利用的化学物质来源。在本研究中，从 和 中提取了 I 型胶原蛋白，并从 中合成了碳点 (CDs)。将这些材料混合，通过浇铸明胶、甘油（15%）和 CDs（0、1、3 和 5%）的混合物，制备出具有紫外屏蔽能力的混合薄膜。从力学、形态和光学角度对薄膜进行了全面表征。这里得到了 40μm 厚的薄膜，具有高水溶性（70%）；此外，CDs 的存在提高了薄膜的力学性能，特别是将拉伸强度（TS）提高到 17MPa，断裂伸长率（EAB）提高到 40%。CDs 还调节了薄膜的水蒸气透过率和热稳定性。从光学角度来看，只需负载 5%的 CDs，薄膜就能阻挡近 70%的紫外线辐射，而透明度（非负载时为 88.6%，负载时为 84.4%）和不透明度（非负载时为 1.32，负载时为 1.61）几乎没有变化。这些类型的混合生物基薄膜有望用于生产可持续的 UV 屏蔽材料，既能保护人体健康，又能延长食品的保质期。
