AgFeO2 exhibit high antibacterial activity against several bacteria species . Ag NPs were used as a probe for the detection of the freshness of fruits and vegetables via grapheneenhanced Raman spectroscopy (GERS) . Silver nanoparticles can be used as a surface for microextraction proteins and other analytes for the analysis using surface-assisted laser desorption-ionization mass spectrometry (SALDI-MS) . It can be also modified with chitosan for the separation and detection of biothiols .