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Biocompatible Photoluminescent Silk Fibers with Stability and Durability
Yuan He1, Li Mei Zhang1, Yong Mei Chen1,2
1State Key Laboratory for Strength and Vibration of Mechanical Structures, International Center for Applied Mechanics, School of Aerospace Engineering, Collaborative Innovation Center of Suzhou Nano Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
Abstract:
Exploring photoluminescent silk fibers, possessing biocompatibility as well as stable and durable fluorescent properties, is a requirement for the development of novel photoluminescent biomaterials. Herein, we fabricate photoluminescent silk fibers, TPCA@SF, via modifying an organic fluorescent molecule (5-oxo-3,5-dihydro-2H-thiazolo [3,2-a] pyridine-7-carboxylic acid, TPCA) onto silk fibers, along with using quaternary ammonium salt didodecyldimethylammonium bromide (DDAB) as a color-fixing agent. The hydrogen bonds and electrostatic association among silk fibers, TPCA and DDAB, ensure the stable modification. The facile and green fabrication process is achieved in water under mild conditions without using any toxic substances. The TPCA@SF manifests the combining features of high quantum yield, fluorescence water-fastness, antiphotobleaching, good mechanical property, and biocompatibility. The strategy holds great potential for exploring various biocompatible photoluminescent substances with stability and durability.
