摘要
Gallic acid-modified chitosan is anchored on silk fibers via metal ion coordination. • Anthocyanin-dyed silk exhibits deeper color depth and improved colorfastness. • The finishing provides durable antibacterial activity and effective UV protection. • High performance is achieved under mild conditions without compromising comfort. Anthocyanins are water-soluble natural pigments widely distributed in plants, exhibiting multiple functions, including antibacterial, antioxidant, and UV-protective properties. However, the molecular structure of anthocyanins is sensitive to environmental conditions and exhibits a weak binding force to textiles, thereby severely limiting their practical application in textile dyeing. Herein, we demonstrate a mild yet effective strategy to enhance the colorfastness and multifunctional performance of anthocyanin-dyed silk fibers using polyphenol-modified chitosan. Firstly, we investigated the effects of temperature, light, and pH on anthocyanin stability and, accordingly, established an optimized dyeing process for silk fabric. Subsequently, gallic acid-modified chitosan (mCS) was immobilized onto anthocyanin-dyed silk fabric via Fe²⁺-mediated coordination, forming a stable network on the silk fibers. The results reveal that mCS@Fe 2 + treatment of anthocyanin-dyed silk fabric exhibited the highest K/S value and superior colorfastness, while further delivering enhanced UV protection, achieving a UPF value of 66.5 while preserving favorable wearability. Moreover, it exhibited antibacterial inhibition rates of 99.42% and 98.33% against E. coli and S. aureus , with the inhibition rate against S. aureus remaining above 85% even after 50 consecutive washing cycles. This work provides new insights into achieving both high colorfastness and multifunctional performance in natural dye-based textile finishing. Download: Download high-res image (204KB) Download: Download full-size image
危险品化学品经营许可证（带存储）