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Dose-effect study on the antioxidant properties of leaves and outer bracts of extracts obtained from Violetto di Toscana artichoke

Coinu, Rita and Carta, Stefania and Urgeghe, Pietro Paolo and Mulinacci, Nadia and Pinelli, Patrizia and Franconi, Flavia and Romani, Annalisa (2007) Dose-effect study on the antioxidant properties of leaves and outer bracts of extracts obtained from Violetto di Toscana artichoke. Food Chemistry, Vol. 101 (2), p. 524-531. ISSN 0308-8146. Article.

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DOI: 10.1016/j.foodchem.2006.02.009

Abstract

Artichoke (Cynara scolymus L.) is an edible vegetable largely used in the Mediterranean diet and in folk medicine. The present paper discusses the analysis of the polyphenol content of leaves and outer bracts of Violetto di Toscana artichoke using different extraction procedures with the aim of establishing a correlation between polyphenol subclasses and antioxidant activity measured on human LDL oxidized by copper ions. HPLC/DAD and HPLC/MS analyses revealed that both the matrixes contain identical polyphenol subclasses, with mainly quantitative differences. The antioxidant effect of four artichoke extracts decreases in the following order when the sum of total phenolic compounds was considered: ethanolic extract from leaves (IC50 = 2.92 ± 0.46 μM); ethanolic extract from outer bracts (IC50 = 4.04 ± 0.21 μM); ethyl acetate extract from leaves (IC50 = 4.91 ± 0.11 μM); ethyl acetate extract from outer bracts (IC50 = 10.18 ± 1.6 μM). IC50 were also calculated considering the concentrations of single polyphenol subclasses. In both cases, the potency of antioxidant properties was not related to the amount of total polyphenols or the single subclasses.

Item Type:Article
ID Code:3950
Status:Published
Refereed:Yes
Uncontrolled Keywords:Cynara scolymus L., caffeoylquinic acids, flavonoids, antioxidant activity
Subjects:Area 05 - Scienze biologiche > BIO/14 Farmacologia
Area 05 - Scienze biologiche > BIO/09 Fisiologia
Area 07 - Scienze agrarie e veterinarie > AGR/15 Scienze e tecnologie alimentari
Divisions:001 Università di Sassari > 02 Centri > Centro di eccellenza interdisc. sviluppo ricerca biotecnologica e studio biodiversità della Sardegna e dell'area mediterranea
001 Università di Sassari > 01 Dipartimenti > Scienze fisiologiche, biochimiche e cellulari
001 Università di Sassari > 01 Dipartimenti > Scienze del farmaco
001 Università di Sassari > 01 Dipartimenti > Scienze ambientali agrarie e biotecnologie agro-alimentari
Publisher:Elsevier
ISSN:0308-8146
Deposited On:25 May 2010 13:37

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