Síntese de nanopartículas de prata mediada por extratos aquosos de myrciaria dubia (camu-camu)

Abstract

In recent years, the development of efficient Green Chemistry methods for the synthesis of metallic nanoparticles has become a major focus for researchers as well as the characterization of the materials produced. This work aimed at the study and production of silver nanoparticles synthesized by reduction of plant extract without the addition of any other constituent for its stabilization in the reaction medium. In this study the methods of synthesis mediated by the reduction of silver ions by ascorbic acid and other biomolecules present in the vegetal extract of camu-camu fruit (Myrciaria dubia) were analyzed, seeking their reproducibility regarding the synthesis conditions used. Colloidal silver nanoparticle dispersions were obtained by varying the synthesis conditions such as reaction time, reagent concentration and temperature, and the progress of the reaction was monitored by the results of UV-visible spectroscopy. The study showed that the extract of camu-camu as a reducing agent is feasible for the reduction of silver ions for the synthesis of nanoparticles in aqueous medium, so that at different concentrations and temperatures the reaction is directly influenced, and the extract, in high concentrations, can decrease the reaction kinetics, causing a decrease in the rate of particle formation. Additionally there is a reduction in the maximum absorbance detected progressively when the temperature of the reaction medium rises, making its extract reduction capacity smaller due to degradation of the biomolecules.