Análise de produtos cosméticos contendo nanopartículas de prata.

Abstract

For many years silver has been used in consumer products due to their antimicrobial properties. With the advent of the observation of atoms, viruses technology, there is the possibility of producing materials at the nanometer scale. Silver, specifically, this nano dimension, would have leveraged their properties, and can overcome the barriers insurmountable biological system at larger scales. The concern, however, about the use of this ingredient in cosmetic products is exposed to use cosmetic products with nanosilver, without having the assurance of safety when in contact with biological systems. Authorities have discussed about nanotechnology, but there is still no consensus on how to define the term nanotechnology and this definition be adopted worldwide. Thus, this work aims to evaluate cosmetic products in order to identify the chemical, structural composition and prove that the silver particles present in cosmetics are in the nanometer scale. The samples were separated in triplicate and characterized by means of X-ray Diffraction, Infrared Spectrometry Fourier Transform, Scanning Electron Microscopy, Thermogravimetric Analysis, Differential Scanning Calorimetry, and Grain Size Distribution Coupled Plasma Spectroscopy. The analyzes were performed at the Laboratory of Development and Evaluation of Biomaterials, Federal University of Campina Grande (UFCG) and Laboratory of the University of Brasilia (UNB). The results showed that the silver compounds are in low concentrations in antiperspirant deodorant products analyzed, reaching parts per million (ppm) and even in some samples parts per billion (ppb), so was difficult precise conclusion, through the characterizations used on presence of nanosilver in the surveyed samples. Based on the results of particle size distribution can be concluded, however, that considering the average size around 300nm particles present in the samples can be concluded that silver. this is not at the nanometer scale, because it turns out in the literature that the synthesized nanopratas are around 20nm.