Phenolic compounds in peel, pulp and seed of olive fruits, their distribution in oil and by-products produced during mechanical oil extraction and the endogenous enzymes that can catalyse phenolic modifications during processing were studied. All the constitutive parts of the fruit contained secoiridoids and phenyl-acids, while luteolin-7-glucoside and rutin were found only in the peel. Crushing led to a strong decrease of secoiridoid glucoside and increase in aglycone derivatives. Verbascoside contnet did not vary significantly. A significant amount of paste phenols (>96%) was found in by-products; oil did not contain either secoiridoid glycosides or verbascoside but showed high concentrations of secoiridoid aglycones. Malaxation reduced phenol concentration in oil and in by-products. High levels of glycosidase and oxidoreductase activities were observed in pulp and seeds.

Phenolic composition of olive fruit and virgin olive oil: distribution in the constitutive parts of fruit and evolution during the oil mechanical extraction process.

SERVILI, Maurizio;BALDIOLI, Maura;MARIOTTI, Federico;MONTEDORO, Gian Francesco
1999

Abstract

Phenolic compounds in peel, pulp and seed of olive fruits, their distribution in oil and by-products produced during mechanical oil extraction and the endogenous enzymes that can catalyse phenolic modifications during processing were studied. All the constitutive parts of the fruit contained secoiridoids and phenyl-acids, while luteolin-7-glucoside and rutin were found only in the peel. Crushing led to a strong decrease of secoiridoid glucoside and increase in aglycone derivatives. Verbascoside contnet did not vary significantly. A significant amount of paste phenols (>96%) was found in by-products; oil did not contain either secoiridoid glycosides or verbascoside but showed high concentrations of secoiridoid aglycones. Malaxation reduced phenol concentration in oil and in by-products. High levels of glycosidase and oxidoreductase activities were observed in pulp and seeds.
1999
9066058714
File in questo prodotto:
Non ci sono file associati a questo prodotto.

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/11391/2398
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact