Plants, their fruits, leaves, roots, flowers are a rich source of phytochemicals. For commercial fruits these phytochemicals are not totally used as the non-edible parts such as seeds or peels are discarded. The objective of this work is to use those apparently “useless” plant parts in the production of high-value products such as silver nanostructures. Silver nanoparticles (AgNPs) display unique optical properties (due to the phenomenon called surface plasmon resonance (SPR)) that can be used in a variety of fields such as medicine or photo-thermal energy. Biologically synthesized NPs with medical applications are part of what is called nanobiotechnology, a relatively new field of science. Plant parts were obtained from restaurants’ waste and the extracts were prepared following a simple maceration process with different solvents. After filtration the solvents were removed with a rotary evaporator to obtain pure solid extracts. 0.1 g of pure extracts were dissolved in 10 ml of water, the pH was adjusted (pH>8.5) and then mixed with a solution of Ag+ 1mM at 40۠°C in an extract: Ag+ proportion 1:10. Different temperatures, pH’s and reaction times were tested in order to find optimal synthesis conditions. The resulting NPs were characterized with UV-vis spectroscopy, scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). Spherical highly stable AgNPs (stability > 1 year) of about 40 – 80 nm with an absorption peak in the 390 – 420 nm range were obtained. The AgNPs cannot be used in photovoltaic applications as the absorption peak is not located in the NIR of the spectrum. However, the strong absorption in the blue part of the spectrum makes this AgNPs suitable to be used in the in the medical field to prevent diseases associated with the overexposure to artificial light sources, such as retinal damage or age-related macular degeneration (AMD).