FIG 1.

Representative UV-visible spectrophotometry of gold (Au)-conjugated chlorhexidine and silver (Ag)-conjugated neomycin showed a surface plasmon resonance band at 500 to 550 nm and 400 to 500 nm. (A) UV-visible spectrophotometry of Au-conjugated chlorhexidine showed a plasmon resonance band at 500 to 550 nm indicative of Au nanoparticles. Conversely, Au alone also showed a band in same region but with lower intensity. Chlorhexidine alone showed a band at around 200 to 250 nm. (B) UV-visible spectrophotometry of Ag-conjugated neomycin showed a plasmon resonance band at around 400 to 450 nm, indicating the synthesis of Ag-conjugated neomycin nanoparticles. Simultaneously, Ag alone also showed a plasmon band at 400 to 450 nm. Furthermore, neomycin alone did not absorb well in the UV spectrum and produced a band of very low intensity at around 250 nm.