Hydrogels applied in cosmetology irradiated by ionizing radiation

Hydrogels are three-dimensionally crosslinked polymers that exhibit high capacity to absorb water or solvents, without compromising its structure, allowing its application in cosmetic products, because it presents easy scattering and vehicular active principles. The use of ionizing radiation to obtain the hydrogels provides the absence of chemical initiators; sterilization; reticulation and adjustment of physical-chemical properties. In this work different types of hydrogels containing PVP concentrations 5%, 7.5% and 10% weight and different radiation 25 and 20 kGy doses were prepared, maintaining PEG concentrations 3% weight and agar 1% weight, based on literature studies. The samples were characterized by dehydration as a function of time, acidity, visual and sensorial analyzes and stability. The results obtained showed that all the compositions are stable, have a pH close to the skin and the compositions containing PVP 5% weight, obtained with radiation of 20 and 25 kGy dose undergo greater dehydration. In sensory research, the hydrogels containing PVP 7.5% weight, obtained with a radiation of 25 kGy dose, presented the best results in terms of absorption, sliding, odor, while the composition containing PVP 10% weight obtained with a radiation of 25 kGy dose, proved to be inadequate in the public perception. Therefore, the hydrogels obtained with PVP 7.5% weight, with radiation of 25 kGy dose were the most suitable for applications in cosmetic products. (author)