Silk fibroin (SF) obtained from Bombyx mori cocoon is a very promising biopolymer. It can be processed from aqueous solutions to obtain many versatile scaffolds useful in optoelectronics, photonics, and biomedicine. Aqueous solutions are prepared by dissolving degummed fibroin with chaotropic agents and then purifying by dialysis. This work presents, for the first time, a solubilization protocol, involving CeCl₃·7H₂O as chaotropic salt in water and ethanol, that allows to regenerate SF under a fibrous form, unlike the standard Ajisawa’s method, which uses CaCl₂ and allows to obtain aqueous gels. All the experimental analyses performed (SEM, XPS, WAXS, ATR‐FTIR, NMR) suggest that the fiber recovered preserves most of the morphological and structural features of the pristine SF and is doped with Ce(III) ions, that interact mainly with the oxygen atoms of CO moieties and side‐chains of amino acids. Ce(III) doped SF could be the base for new luminescent materials.

中文翻译：

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CeCl3水溶液中的丝素蛋白处理：纤维再生和Ce（III）掺杂

从得到的丝纤蛋白（SF）家蚕的茧是一个非常有前途的生物聚合物。可以从水溶液中进行处理，以获得许多可用于光电，光子学和生物医学的通用支架。通过将脱胶的丝蛋白溶解于离液剂中，然后通过透析纯化来制备水溶液。这项工作首次提出了增溶方案，其中涉及在水和乙醇中作为离液盐的CeCl ₃ ·7H ₂ O作为离液盐，与标准的Ajisawa方法使用CaCl ₂的方法不同，该方案允许以纤维形式再生SF。并允许获得水性凝胶。进行的所有实验分析（SEM，XPS，WAXS，ATR-FTIR，NMR）均表明，回收的纤维保留了原始SF的大部分形态和结构特征，并掺杂了Ce（III）离子，这些离子主要与Fe相互作用。 CO部分的氧原子和氨基酸侧链。Ce（III）掺杂的SF可能是新型发光材料的基础。