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首页> 外文期刊>RSC Advances >Tunable surface wettability and pH-responsive 2D structures from amphiphilic and amphoteric protein microfibrils
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Tunable surface wettability and pH-responsive 2D structures from amphiphilic and amphoteric protein microfibrils

机译：来自两亲性和两性蛋白质微纤维的可调谐表面润湿性和pH响应2D结构

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摘要

Two dimensional films and paper-like structures (60-170 mu m thick) have been facilely fabricated by casting ethanolic dispersions of amphiphilic and amphoteric protein microfibrils (ca.1.3 mu m width; 53 mu m length) under controlled temperatures and moisture levels. Surface hydrophilicity or hydrophobicity can be easily tuned by the abillity of the highly responsive microfibers to self-organize at the interface to mimic the hydrophilicity or hydrophobicity of cast substrates. For instance, surfaces cast on hydrophobic polystyrene or Teflon were moderately hydrophobic with water contact angles (WCAs) of 54 degrees-71 degrees while those on hydrophilic glass or exposed to air were hydrophilic (WCAs: 5 degrees-10 degrees). Thin film dried in the presence of moisture (60% RH) at 65 degrees C had the highest crystallinity (CrI: 56%) and beta structure (64%), including 48% beta-sheet form, and exhibited moisture-responsiveT(g), pH-responsive planar swelling, and excellent wet resiliency in extremely acidic (pH = 0) to basic (pH = 10) conditions. The pH-dependent release of highly water-soluble cationic methylene blue bound to protein microfibril (SPMF) films attests to their amphoterism and demonstrates the applicability of such 2D structures for pH-dependent controlled release of other cationic and anionic species. Such versatility of amphiphilic and amphoteric protein microfibrils can be engineered into 2D structures with tunable surface hydrophilicity and hydrophobicity, moisture- and pH-responsive behaviors and controlled release capabilities.
机译：通过在受控温度和水分水平下铸造两亲性和两性蛋白质微纤维（Ca.1.3μm宽度;53μm长度）浇铸乙醇分散体的两维薄膜（60-170μm厚）。表面亲水性或疏水性可以通过高度响应的微纤维的余量容易地调整，以在界面处自组织以模拟铸造衬底的亲水性或疏水性。例如，在疏水性聚苯乙烯或Teflon上施放的表面与54度-71度的水接触角（WCA）中度疏水，而亲水性玻璃或暴露在空气中的那些是亲水的（WCAS：5度-10度）。在65℃下在水分（60％RH）存在下干燥的薄膜具有最高的结晶度（CRI：56％）和β结构（64％），包括48％β-片状，并显示出水分响应（g ），pH-响应平面溶胀，以及极其酸性（pH = 0）的优异的湿润弹性至基本（pH = 10）条件。与蛋白质微纤维（SPMF）膜结合的高度水溶性阳离子亚甲基蓝色的pH依赖性释放证明了它们的两性性，并证明了这种2D结构对其他阳离子和阴离子物种的pH依赖性控制释放的适用性。两亲性和两性蛋白微纤维的这种多种性可以设计成具有可调表面亲水性和疏水性，水分和pH响应性的2D结构和控制释放能力。

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  • 来源
    《RSC Advances》 |2020年第55期|共7页
  • 作者

    Liu Xingchen; Hsieh You-Lo;

  • 作者单位

    Univ Calif Davis Dept Biol &

    Agr Engn Davis CA 95616 USA;

    Univ Calif Davis Dept Biol &

    Agr Engn Davis CA 95616 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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