Influencia del tipo de solvente y pH para la extracción de compuestos reductores de residuos vinícolas en la producción de nanopartículas de plata

The objective of the study was to evaluate the influence of the type of solvent (commercial alcohol 96% and absolute ethanol) and pH (1.7, 3.5 and 5.5) in the process of extracting phenolic compounds present in the residues of the wine production to apply them as an agent Silver nitrate precursor reducer (AgNO3) in the green synthesis of silver nanoparticles (NP Ag). The silver colloids obtained were initially evaluated by UV-Vis spectrophotometry, which determined in the foreground the presence of colloids with high production of nanoparticles in the cases of commercial alcohol 96% and ethanol both with pH = 3.5, with absorbance values in 2.21 u.a/425.9 nm. and 2.8 u.a /431.8 nm. respectively; It was also possible to visualize a medium production with both types of solvents, but with pH = 5.5, the results being 1.91 u.a./424.6 nm. for commercial alcohol 96% and 1.98 u.a./425.2 nm. for ethanol, in all the cases described above the spectra show high monodispersity due to the characteristics of the absorbance peak; It was also possible to show a minimum production of NP Ag when 96% commercial alcohol was used at a pH = 1.7 (0.392 u.a./415.4 nm.) but with high polydispersity; in the case of ethanol pH = 1.7 there was no presence of optical absorbance peak, which implies the non-formation of NP Ag; It should be noted that stability over time was also evaluated; as well as FTIR spectra, which determine the presence of phenolic radicals in the cases described above. The results suggest the potential reducing effect of the alcoholic extract of residues from wine production at a pH value = 5.5, because it achieved a complete reaction and are stable over time.