Fatty acids methyl ester (FAME) reference standard mixture 37 (standard 47885-U) was purchased from Sigma-Aldrich (St. Louis, Missouri, USA), as also sugar standards. 2,2-Diphenyl-1-picrylhydrazyl (DPPH) was obtained from Alfa Aesar (Ward Hill, Massuchets, USA). Water was treated in Milli-Q water purification system (Millipore Corporation, Billerica, Massachusetts, USA).