Among the unusual vegetable fats, acorn oil has interesting nutritional and functional properties. Few studies are present in literature on acorn oil characterization and antioxidant activity evaluation while no studies are present regarding the analysis of the phenolic profile. The present study aims at investigating the content of hydrophilic and lipophilic phenolic compounds and pigments, as well as antioxidant properties and quality of the oil extracted from three Quercus species grown in Algeria. Oil yield, expressed as dry weight, was in the range 7.05–8.40%. Tocopherols contents were remarkable for the three species (539–676 mg kg−1), with (β + γ)-tocopherols being the most abundant. Oils had also significant amounts of carotenoids (42–66 mg kg−1) and similar polyphenol patterns, but with a wide quantitative variability between species (195–436 mg kg−1). Twenty phenolic compounds were detected, 12 of which were tentatively identified. All of them were hydrolysable tannins derivatives (gallotannin or ellagitannin). Oils methanolic extracts had remarkable antioxidant activity; up to 3.34 and 3.79 μmol TE g−1 oil (DPPH and ABTS test, respectively). Quercus oil is a potential source of natural antioxidants, and it could be used as a new functional oil.

Antioxidant activity, tocopherols and polyphenols of acornoil obtained from Quercus species grown in Algeria

Squeo, Giacomo;Trani, Antonio;Caponio, Francesco
2018-01-01

Abstract

Among the unusual vegetable fats, acorn oil has interesting nutritional and functional properties. Few studies are present in literature on acorn oil characterization and antioxidant activity evaluation while no studies are present regarding the analysis of the phenolic profile. The present study aims at investigating the content of hydrophilic and lipophilic phenolic compounds and pigments, as well as antioxidant properties and quality of the oil extracted from three Quercus species grown in Algeria. Oil yield, expressed as dry weight, was in the range 7.05–8.40%. Tocopherols contents were remarkable for the three species (539–676 mg kg−1), with (β + γ)-tocopherols being the most abundant. Oils had also significant amounts of carotenoids (42–66 mg kg−1) and similar polyphenol patterns, but with a wide quantitative variability between species (195–436 mg kg−1). Twenty phenolic compounds were detected, 12 of which were tentatively identified. All of them were hydrolysable tannins derivatives (gallotannin or ellagitannin). Oils methanolic extracts had remarkable antioxidant activity; up to 3.34 and 3.79 μmol TE g−1 oil (DPPH and ABTS test, respectively). Quercus oil is a potential source of natural antioxidants, and it could be used as a new functional oil.
File in questo prodotto:
File Dimensione Formato  
Lavoro 292 - FRI - olio ghianda Fatima.pdf

non disponibili

Tipologia: Documento in Versione Editoriale
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 316 kB
Formato Adobe PDF
316 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/226868
Citazioni
  • ???jsp.display-item.citation.pmc??? 5
  • Scopus 29
  • ???jsp.display-item.citation.isi??? 26
social impact