foods Article Bioactive Compounds of a Wheat Bran Oily Extract y Obtained with Supercritical Carbon Dioxide Sara Rebolleda 1, María Luisa González-San José 1 , María Teresa Sanz 1 , Sagrario Beltrán 1,* and Ángela G. Solaesa 2 1 Department of Biotechnology and Food Science, University of Burgos, Plaza Misael Bañuelos s/n, 09001 Burgos, Spain;
[email protected] (S.R.);
[email protected] (M.L.G.-S.J.);
[email protected] (M.T.S.) 2 Department of Agriculture and Forestry Engineering, Food Technology, College of Agricultural and Forestry Engineering, University of Valladolid, 47011 Valladolid, Spain;
[email protected] * Correspondence:
[email protected]; Tel.: +34-947-258810; Fax: + 34-947-258831 The paper is based on chapter 3 of Sara Rebolleda’s PhD thesis. y Received: 1 April 2020; Accepted: 10 May 2020; Published: 13 May 2020 Abstract: A wheat bran oily extract obtained with supercritical carbon dioxide at 25.0 0.1 MPa ± and 40 2 C has been analyzed in order to determine some valuable bioactive compounds as ± ◦ alkylresorcinols, α-linolenic acid, steryl ferulates, tocopherols and phenolic compounds, which levels were around 47, 37, 18, 7 and 0.025 mg/g oily extract, respectively. To our knowledge, this is the first time that the presence of steryl ferulates has been observed in a supercritical fluid extract of wheat bran and that γ-tocopherol has been described in wheat bran oily extracts. Other common quality parameters, directly correlated with oxidative degradation, were also evaluated. Acidity values around 15% oleic acid were detected, while low levels of hydroperoxides (around 2.4 meq O2/kg) and very low levels of hexanal (0.21 ppb) were found.