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首页> 外文期刊>Journal of Applied Polymer Science >Laccase-mediated grafting of polyphenols onto cationized cotton fibers to impart UV protection and antioxidant activities
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Laccase-mediated grafting of polyphenols onto cationized cotton fibers to impart UV protection and antioxidant activities

机译：漆酶 - 介导的多酚嫁接到阳离子化的棉纤维上以赋予紫外线保护和抗氧化活性

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摘要

Enzyme-mediated in situ functionalization of cotton fibers was studied using laccase. Caffeic acid and morin were used as reactive phenolic substrates for laccase and further employed to the modification of fiber surfaces. Laccase-mediated oxidation and polymerization reactions of caffeic acid were monitored by ultraviolet-visible spectroscopy. During the wetting process, initial cationization of fiber surfaces using poly(diallyldimethylammonium chloride) followed by enzymatic treatment with phenolic substrates resulted ineffective polymer grafting evidenced by high color stability. Changes of fiber surface properties by polymer grafting, such as morphology and hydrophilicity/hydrophobicity, were tested using scanning electron microscopy and gravimetric absorption tests. An acceptable level of color resistance to washing stress was obtained on caffeic acid treated samples, and a high level of rubbing resistance was obtained on samples treated with both caffeic acid and morin. Regarding the ultraviolet protection test, the cationized and enzymatically functionalized samples showed a very good protection grade (ultraviolet protection factor=25). Finally, the antioxidant activity test of the modified fibers presented an improvement for radical scavenging potential due to the phenolic compounds incorporated to cotton fibers by laccase-mediated catalysis. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45801.
机译：使用漆酶研究棉纤维的原位官能化的酶介导。咖啡酸和Morin用作漆酶的反应性酚醛基材，并进一步用于修饰纤维表面。通过紫外线可见光谱监测含泪晶酸的氧化和聚合反应。在润湿过程中，使用聚（二烯丙基甲基氯化铵）的纤维表面的初始阳离子化，然后用酚醛基材进行酶处理，得到了高色稳定性的高度效果的无效聚合物移植。使用扫描电子显微镜和重量吸收试验测试聚合物接枝的纤维表面性能的变化，例如形态和亲水性/疏水性。在咖啡酸处理的样品上获得了对洗涤应力的可接受的抗性水平，并在用咖啡酸和MORIN处理的样品上获得高水平的摩擦阻。关于紫外线保护试验，阳离子化和酶官能化样品显示出非常好的保护级（紫外线保护因子= 25）。最后，改性纤维的抗氧化活性试验提高了由于纳米晶β介导的催化催化剂掺入棉纤维的酚类化合物而改善。 （c）2017 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2018,135,45801。

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