Crude oil (ether extract), crude protein, and crude fiber were all analyzed using analytical-grade solvents that were acquired from Honeywell Fluka (Fisher Scientific Italia, Milan, Italy). Chemical standards (analytical grade) were provided by Sigma-Aldrich (Merck KgaA, Darmstadt, Germany). Sodium carbonate, potassium persulfate, 2,2′-Azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS), 6-hydroxy-2,5,7,8-tetramethy-chromam-2-carboxylic acid (Trolox), gallic acid, and 2,2-diphenyl-1-picrylhydrazyl (DPPH) were also purchased from Sigma-Aldrich (Merck KgaA, Darmstadt, Germany).
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