With aim to achieve high quality resource utilization of waste sericin,the characteristics and electro-spinnability of regenerated silk sericin polypeptides(RSP)aqueous solutions were investigated.The stability,steady rheological behavior and surface tension of RSP aqueous solutions were studied.The morphologies and structures of as-fabricated RSP products were characterized by scanning electron microscope(SEM)and Fourier transform infrared spectrometer(FT-IR).The concentration of RSP aqueous solution can reach 70％,which is much higher than that of conventional electrospinning(10％～20％).The RSP solutions have a good storing stability,and the concentration of RSP solution has significant effects on the steady-state rheological behavior and surface tension.The morphology of electrospun RSP products could be tuned by adjusting the concentration of RSP aqueous solution(40％～70％).The spinnability of 60％RSP aqueous solution is the best and the RSP nanofibers are well formed and distributed uniformly with smooth surface.Interestingly,the longitudinal surface shows an obvious flat band structure with the average width of 814.8 nm.The conformations of the RSP nanofibers are mainly of random coil and α helix.In addition,the feasibility using the as-fabricated RSP nanofibers as functional layer of solid mask was investigated.The RSP nano fibers have good scavenging abilities towards 1,1-diphenyl-2-trinitrophenylhydrazine(DPPH)and superoxide anion free radicals with a radical scavenging rate of 67.82％and 52.68％,respectively,indicating a strong antioxidant effect.The as-fabricated RSP nanofibers is an excellent candidate of solid mask material.
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