Data on oxidative stability and elemental analysis of Brazilian sunflower oils used as healing agents
This dataset article provides information on analysis of fatty acid methyl esters (FAMEs), oxidative stability, as well as Ultraviolet-Visible and Visible absorption spectra of five samples of Brazilian oils used in the treatment of wounds. Five brands of Brazilian companies that sell sunflower oils used as healing agents were selected. In detail, the dataset presents: 1- The fatty acid methyl esters (FAMEs) ere analyzed by gas chromatography (Thermo Fisher Scientific, FOCUS GC) to obtain their individual peaks. 2- The oxidative stability of the oils was evaluated by Rancimat 893 method (Metrohm Co, Basel). The Rancimat analysis to determine the oxidation stability of oils (fatty acid methyl ester, FAME) was carried out in accordance with EN 14112, EN 15751 and EN 16568 standards. 3- Thermogravimetry (TG), Derivative Thermogravimetry (DTG) and Differential Scanning Calorimetry (DSC) data were performed using TGA Q-50 equipment (TA Instruments, New Castle, DE, USA) and DSC-Q20 equipament, coupled to an RCS90 refrigeration system (TA Instruments, New Castle, DE, USA). Graphs were obtained using Universal Analysis Software. 4- Ultraviolet-Visible and Visible absorption spectra were obtained using a Multiskan SkyHigh Microplate Spectrophotometer (Thermo Scientific).
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Five brands of oils used to treat wounds were acquired in Brazilian pharmacies: Dauf Protect®, Moph Derme®, Needs Care®, Derma Star® and Dersol®. The fatty acid methyl esters (FAMEs) were prepared with a derivatization solution of ammonium chloride, methanol and sulfuric acid. We used gas chromatography to identify 14 FAMEs present in five samples of essential oils used in wound care. Preparation of the oil samples to analysis by Rancimat®: An aliquot of 3.0 ± 0.1g was collected from each oil sample and individually dissolved in deionized water. Thus, the oxidative stability of the five oils was expressed as the oxidative induction period (IP, hrs) measured at 110 °C. To obtain the thermogravimetric analysis curves, approximately 8.1 mg of oils were heated from 30 to 600 °C under nitrogen flow (60 ml/min), heating rate of 10 °C/min. For the differential scanning calorimetry (DSC), the DSC curves were obtained using approximately 8.1 mg of oil under nitrogen atmosphere with a flow rate of 50 mL/min, heating/cooling rate of 20 ºC/min in heating cycles and subsequently cooling in temperature ranges from 40º C to – 85 ºC. Five graphs of the absorption of the five oils were obtained from the UV-VIS points.