Casein as the major protein of milk is a promising protein source for biopolymer fibers. Current casein-based fibers are fabricated by dissolving caseins in alkaline media and wet spinning in a coagulation bath containing harsh chemicals. In milk, casein is present in so-called casein micelles (CMs). Based on the rennet-induced aggregation, we developed a process that can be applied for the spinning of micellar casein fibers in a sustainable way without the use of harsh chemicals. Fabricated fibers show a surface with a characteristic microstructure, which can also be detected embedded in a network structure inside the fiber. The fibers are stable under acidic and neutral conditions and decompose in alkaline media down to aggregates with sizes comparable to the characteristic microstructure. The so far reached tensile properties of the micellar fiber are between low and mid double-digit percentage range compared to casein azlons. Graphical abstract Graphical abstract

中文翻译：

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来自经凝乳酶处理的酪蛋白胶束的再生纤维

作为牛奶的主要蛋白质的酪蛋白是生物聚合物纤维的有前途的蛋白质来源。目前的酪蛋白纤维是通过将酪蛋白溶解在碱性介质中并在含有刺激性化学物质的凝固浴中湿纺制成的。在牛奶中，酪蛋白存在于所谓的酪蛋白胶束 (CMs) 中。基于凝乳酶诱导的聚集，我们开发了一种工艺，可以在不使用刺激性化学品的情况下以可持续的方式应用于胶束酪蛋白纤维的纺丝。制造的纤维表面具有特征微结构，也可以检测到嵌入纤维内部的网络结构中。纤维在酸性和中性条件下是稳定的，并在碱性介质中分解成尺寸与特征微观结构相当的聚集体。与酪蛋白 azlons 相比，胶束纤维迄今为止达到的拉伸性能介于低和中两位数百分比范围之间。图形摘要图形摘要