Nature-Inspired and “Water-Skating” Paper and Polyester Substrates Enabled by the Molecular Structure of Poly(γ-stearyl-α,l-glutamate) Homopolypeptide,Biomacromolecules

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Nature-Inspired and “Water-Skating” Paper and Polyester Substrates Enabled by the Molecular Structure of Poly(γ-stearyl-α,l-glutamate) Homopolypeptide
Biomacromolecules ( IF 5.5 ) Pub Date : 2018-11-16 00:00:00 , DOI: 10.1021/acs.biomac.8b01312
Cornelia Rosu _{1,

2} , Yeongseon Jang ₁ , Lu Jiang _{1,

3} , Julie Champion ₁

Affiliation

We demonstrate that the molecular structure of a synthetic homopolypeptide that resembles the leg architecture of water strider insects is effective to impart flexible polymeric surfaces with superhydrophobic behavior. Filter paper (FP) and polyester (PET) were modified with a coating consisting of low-molecular weight α-helical poly(γ-stearyl-α,l-glutamate) (PSLG, M_w = 4500 Da) homopolypeptide. PSLG-coated substrates displayed near to and superhydrophobic behavior (≥150°) as reflected by the contact angle values. Despite being physically adsorbed, the PSLG coating uniformly covered and was strongly adhered to the substrate surfaces. The thin coating layer displayed remarkable mechanical abrasion resistance and was insensitive to long-time exposure to ambient conditions. PLSG-coated textile fibers exhibited useful and interesting properties. Under an iron-containing load, PSLG-coated PET was able to float and “walk” on water when exposed to a magnet. The PSLG coating was able to reduce the adhesion of Escherichia coli, model Gram-negative bacteria. The results indicated that the molecular geometry of PSLG homopolypeptide, which possesses a α-helical backbone sprouting out of highly hydrophobic stearyl side chains, was the key feature responsible for the observed behaviors. This study is relevant for a broad range of potential applications: from crop and drinking water management in arid geographic areas to biomedical devices and implants.

中文翻译：

聚（十八烷基硬脂酸-α，l-谷氨酸）同源多肽的分子结构实现自然启发和“滑水”的纸和聚酯基材

我们证明了类似于水str昆虫的腿结构的合成同多肽的分子结构可有效赋予具有超疏水行为的柔性聚合物表面。滤纸（FP）和聚酯（PET）用低分子量α-螺旋聚（γ-硬脂基-α，l-谷氨酸）（PSLG，M _w＝ 4500Da）同多肽。涂有PSLG的基材显示出接近和超疏水的性能（≥150°），如接触角值所反映。尽管被物理吸附，但PSLG涂层仍被均匀覆盖并牢固粘附在基材表面上。薄涂层显示出显着的机械耐磨性，并且对长时间暴露于环境条件不敏感。PLSG涂层的纺织纤维表现出有用和有趣的特性。在含铁负载下，涂有PSLG的PET暴露于磁铁后能够漂浮并在水中“行走”。PSLG涂层能够降低大肠杆菌的粘附力，模拟革兰氏阴性细菌。结果表明，具有高疏水性硬脂基侧链发芽的α-螺旋主链的PSLG同多肽的分子几何结构是观察行为的关键特征。这项研究与广泛的潜在应用相关：从干旱地区的农作物和饮用水管理到生物医学设备和植入物。

更新日期：2018-11-16

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