OrangerV1, Main, Exploration, bibRecord, 002632

Reduction kinetics of the free stable radical 2,2-diphenyl-1-picrylhydrazyl (DPPH*) for determination of the antiradical activity of citrus juices

Identifieur interne : 002632 ( Main/Exploration ); précédent : 002631; suivant : 002633

Reduction kinetics of the free stable radical 2,2-diphenyl-1-picrylhydrazyl (DPPH*) for determination of the antiradical activity of citrus juices

Auteurs : Jose M. Sendra [Espagne] ; Enrique Sentandreu [Espagne] ; Jose L. Navarro [Espagne]

Source :

European food research and technology A. [ 1438-2377 ] ; 2006.

RBID : Pascal:06-0406936

Descripteurs français

Pascal (Inist)
- Réduction, Cinétique, Radical libre, Citrus unshiu, Antioxydant, Citrus sinensis, Citrus reticulata, Méthode.

English descriptors

KwdEn :
- Antioxidant, Citrus reticulata, Citrus sinensis, Citrus unshiu, Free radical, Kinetics, Method, Reduction.

Abstract

There is vast epidemiological evidence for the beneficial effects that the consumption of citrus juices exerts on human health. These effects are attributed to their content in substances exhibiting free radical scavenging and antioxidant activities, mainly ascorbic acid, flavonoids, carotenoids and polyphenolic derivatives. This work describes an approximation to the reduction kinetics of the stable free radical 2,2-diphenyl-l-picrylhydrazyl (DPPH*) by the free radical scavenging activity of juices from sweet orange (Citrus sinensis L.), clementine (Citrus reticulata Blanco) and satsuma (Citrus unshiu K. Marc), as well as the deduction of a kinetic equation to fit the experimental data. This equation contains two contributions. The first contribution accounts for the concentration of DPPH* reduced by the cumulative antiradical activity of those citrus juice components that are capable of fast hydrogen atom transfer (fast-kinetics), mainly ascorbic acid and some polyphenolic derivatives; the second accounts for the concentration of DPPH* reduced by the cumulative antiradical activity of those citrus juice components that are capable of slow hydrogen atom transfer (slow-kinetics), mainly flavanone-7-O-glycosides and some polyphenolic derivatives. This methodology thus permits the determination of the total antiradical activity of a citrus juice (expressed as molar equivalents of ascorbic acid), as well as the partial contributions of the cumulative antiradical activities (also expressed as molar equivalents of ascorbic acid) due to both fast-kinetics and slow-kinetics.

Affiliations:

Espagne

Links toward previous steps (curation, corpus...)

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to stream PascalFrancis, to step Checkpoint: 000522
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to stream Main, to step Curation: 002632

Le document en format XML

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<front><div type="abstract" xml:lang="en">There is vast epidemiological evidence for the beneficial effects that the consumption of citrus juices exerts on human health. These effects are attributed to their content in substances exhibiting free radical scavenging and antioxidant activities, mainly ascorbic acid, flavonoids, carotenoids and polyphenolic derivatives. This work describes an approximation to the reduction kinetics of the stable free radical 2,2-diphenyl-l-picrylhydrazyl (DPPH*) by the free radical scavenging activity of juices from sweet orange (Citrus sinensis L.), clementine (Citrus reticulata Blanco) and satsuma (Citrus unshiu K. Marc), as well as the deduction of a kinetic equation to fit the experimental data. This equation contains two contributions. The first contribution accounts for the concentration of DPPH* reduced by the cumulative antiradical activity of those citrus juice components that are capable of fast hydrogen atom transfer (fast-kinetics), mainly ascorbic acid and some polyphenolic derivatives; the second accounts for the concentration of DPPH* reduced by the cumulative antiradical activity of those citrus juice components that are capable of slow hydrogen atom transfer (slow-kinetics), mainly flavanone-7-O-glycosides and some polyphenolic derivatives. This methodology thus permits the determination of the total antiradical activity of a citrus juice (expressed as molar equivalents of ascorbic acid), as well as the partial contributions of the cumulative antiradical activities (also expressed as molar equivalents of ascorbic acid) due to both fast-kinetics and slow-kinetics.</div>
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Reduction kinetics of the free stable radical 2,2-diphenyl-1-picrylhydrazyl (DPPH*) for determination of the antiradical activity of citrus juices

Reduction kinetics of the free stable radical 2,2-diphenyl-1-picrylhydrazyl (DPPH*) for determination of the antiradical activity of citrus juices

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri