Before the measurement a calibration curve
was obtained with a series of diluted AgNO3 solutions. After 12 h
of incubation all AgNPs-(PAA/PDDA)n film-modified silk samples
(n = 2, 4, 6 and 8) release around 3 lM Ag+
, implying that the modified
silk should have an antibacterial activity at the initial stage.