Ozonizing sunflower oil using Fourier-transform infrared spectroscopy for product characterization

Abstract

Patients with skin diseases may have their quality of life affected. Many of them have chronic skin lesions or some form of complication during the healing process. Ozone therapy is a low-cost method with efficient results, including the easy application of ozonized oil to the skin. However, studies report divergent times for the ozonation process of vegetable oil. This work aims to characterize, using the Fourier transform infrared (FT-IR) spectroscopy technique, sunflower oil ozonized at different exposure times. Nine samples of oil were treated up to 90 min with ozone (maximum applied ozone dosage of 117.0 g L−1) and, together with the control sample, were analyzed by FT-IR and the spectra deconvoluted in relation to the main bands observed by the second derivative. Two spectral regions were investigated: 1800 – 800 cm−1 and 3050 – 2800 cm−1. The results indicated a statistically significant difference between the spectra, especially after 20 min of the ozonation process. A decrease in oil temperature was observed 30 min after the beginning of the ozonation process, with a decrease in the intensity of the –CH stretching band of the fragment –CC–H above 3000 cm−1, an increase of the intensity of the C–H stretching bands of the CH3 groups, decrease of intensity of the stretching bands of –CC– chemical bond, and constant intensity of the –CO stretching band.