Zhang Wen, Tang Ren-Cheng
National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering, Soochow University, 199 Renai Road, Suzhou 215123, China.
Polymers (Basel). 2018 Jun 10;10(6):648. doi: 10.3390/polym10060648.
In this work, the Maillard reaction of polyglutamic acid (PGA) and glucose (Glc) was studied, and its functional, polymeric, and colored products were used to dye silk fiber with the aim of imparting bioactivities to silk. The UV⁻Vis spectroscopic analysis, which was employed to monitor the reaction, revealed the rapid formation of yellowish-brown products at pH 12 and 90 °C, and the great impact of glucose content on the quantity of the products. The FT-IR analysis validated the formation of melanoidin colorants. The silk fiber dyed with the PGA/Glc reaction products at pH 3 displayed a yellowish-brown color, and had very good wash and rub fastness, but poor light fastness. The incorporation of the UV-absorbing moiety into the PGA/Glc reaction products enhanced their light stability. The SEM analysis revealed that the dyed silk fiber was covered by polymeric substances. The dyed silk exhibited durable antibacterial activity against and , and good antioxidant activity. This research expands the application field of the Maillard reaction and provides a novel and eco-friendly approach to prepare the colored and bioactive silk materials.
在本研究中，对聚谷氨酸（PGA）与葡萄糖（Glc）的美拉德反应进行了研究，并利用其功能性、聚合性和有色产物对丝纤维进行染色，旨在赋予丝绸生物活性。用于监测该反应的紫外-可见光谱分析表明，在pH值为12、90℃的条件下迅速形成了黄棕色产物，且葡萄糖含量对产物的量有很大影响。傅里叶变换红外光谱分析证实了类黑素色素的形成。在pH值为3时用PGA/Glc反应产物染色的丝纤维呈现黄棕色，具有很好的耐洗和耐摩擦牢度，但耐光牢度较差。将紫外线吸收部分引入PGA/Glc反应产物中可提高其光稳定性。扫描电子显微镜分析表明，染色的丝纤维被聚合物覆盖。染色后的丝绸对[具体细菌名称1]和[具体细菌名称2]表现出持久的抗菌活性，以及良好的抗氧化活性。本研究拓展了美拉德反应的应用领域，并提供了一种新颖且环保的方法来制备有色且具有生物活性的丝绸材料。
