sample from aqua argentum and a dispersion of nanosilver of the prior art which was found to agglomerate all samples contained a silver concentration determined by icp ms of 40 mg ag l the absorption spectrum for the nanosilver on the biocomponent showed a broad absorption peak with a maximum absorption at 425 nm and another absorption peak at 265 nm the latter peak could be attributed to nucleic acids proteins and various organic species present in the biocomponent the uv vis absorption spectrum of the extracted bionanosilver prepared as described above showed a well defined surface plasmon resonance band centered at 428 nm this maximum was of a higher intensity than the 265 nm peak indicative for the presence of various organic species at the surface that were relatively decreased when compared to the spectrum for the nanosilver on the biocomponent the spr peak did not tail as far as the spr peak for nanosilver on the biocomponent indicative for a more pure product with less aggregation only a very low absorption was measured for 40 mg l ag in the aqua argentum sample a maximum absorption was measured at 439 nm the sample prepared according to the prior art did not show the typical uv vis absorption spectrum related to spr this was related to the agglomeration of the nanosilver into large aggregates in the uv vis absorption spectrum.