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The synthesis of nanoparticles by green chemistry offers a method that respects the environment. The experimental conditions and the existing interactions between the reducing agents in Cupressus goveniana extract and the Au +3 ions have a directly influence in the size, morphology and stability, as well as the physicochemical properties of the particles. Is possible consider he formation of AuNPs in the change of color of the extract when adding the precursor agent and by UV-Visible spectroscopy, indicating a plasmon of absorbance characteristic of this metal. The extract was characterized by FTIR, and to evaluate the reductive capacity of Cupressus goveniana extract, a cyclic voltammetry was carried out, for which the reducing capacity of the Au +3 ions is attributed to obtain the AuNPs.

Through the methods of green synthesis we seek to obtain metallic nanoparticles taking advantage of the bioactive principles of plants that serve as reducing and stabilizing agents. In the present work, nanoparticles of gold (AuNPs) were synthesized using the extract of the species Sedum praealtum. When analyzing this extract by Fourier-transform infrared spectroscopy (FTIR), the functional groups present were found attributed to acid groups and OH the reducing capacity of the ions Au +3 . The synthesis of AuNPs was carried out under temperatures of 80 to 85°C, with constant agitation and varying the relation of the concentration of extract and precursor agent. Colloidal AuNPs solutions were analyzed using UV-Vis spectroscopy, the obtained spectra presented an absorption band around 550 nm, which proved to obtain AuNPs. Analyzing the extract and colloidal solution of AuNPs by cyclic voltammetry, corroborated the reducing power of the species against the ions Au +3 .