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Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/17968
Título

Phenolic Compounds and Fatty Acids from Acorns (Quercus spp.), the Main Dietary Constituent of Free-Ranged Iberian Pigs

AutorCantos Villar, Emma; Espín de Gea, Juan Carlos ; López-Bote, Clemente; Hoz, Lorenzo de la; Tomás Barberán, Francisco; Ordóñez, Juan A.
Palabras claveAcorn
Antioxidant
Tocopherol
Fatty acid
Phenolics
Ellagitannins
Iberian pig
Quercus spp
Fecha de publicación10-sep-2003
EditorAmerican Chemical Society
CitaciónJournal of Agricultural and Food Chemistry 51(21): 6248-6255 (2003)
ResumenThe aim of the present work was to identify and quantify the phenolic compounds and fatty acids in acorns from Quercus ilex, Quercus rotundifolia, and Quercus suber. The concentration of oleic acid was >63% of total fatty acids in all cases, followed by palmitic and linoleic acids at similar concentrations (12−20%). The concentrations of α-tocopherol in Q. rotundifolia, Q. ilex, and Q. suber were 19, 31, and 38 mg/kg of dry matter (DM), respectively, whereas the concentrations of γ-tocopherol were 113, 66, and 74 mg/kg of DM, respectively. Thirty-two different phenolic compounds were distinguished. All of them were gallic acid derivatives, in the form of either galloyl esters of glucose, combinations of galloyl and hexahydroxydiphenoyl esters of glucose, tergallic O- or C-glucosides, or ellagic acid derivatives. Several tergallic acid C-glucosides were also present in the extracts obtained from Q. suber. Acorns from Q. ilex and Q. rotundifolia showed similar polyphenol patterns mainly with gallic acid-like spectra. Chromatograms of Q. suber showed mainly polyphenols with ellagic acid-like spectra. Valoneic acid dilactone was especially abundant in Q. suber skin. The contribution of skin to the total phenolics of the acorn was relatively small in Q. rotundifolia and Q. ilex but relatively high in Q. suber. Skin extracts from Q. suber, Q. rotundifolia, and Q. ilex showed 1.3, 1.4, and 1.0 antioxidant efficiencies, respectively (compared to that of butylhydroxyanisole). Endosperm extracts showed lower capacity to prevent lipid peroxidation than skin extracts.
Descripción8 pages, 6 figures, 4 tables.
Versión del editorhttp://dx.doi.org/10.1021/jf030216v
URIhttp://hdl.handle.net/10261/17968
DOI10.1021/jf030216v
ISSN1520-5118 (Online)
0021-8561 (Print)
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