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Characterization of the antioxidant properties of phenolic extracts from some citrus peels

Identifieur interne : 001781 ( Main/Exploration ); précédent : 001780; suivant : 001782

Characterization of the antioxidant properties of phenolic extracts from some citrus peels

Auteurs : G. Oboh [Nigeria] ; A. O. Ademosun [Nigeria]

Source :

Journal of food science and technology [ 0022-1155 ] ; 2011.

RBID : PMC:3550823

Abstract

This study sought to determine the distribution of free and bound phenolics in some Nigerian citrus peels [orange (Citrus sinensis), grapefruit (Citrus paradisii) and shaddock (Citrus maxima)] and characterize the antioxidant properties. The free phenolics were extracted with 80% acetone, while the bound phenolics were extracted from the alkaline and acid hydrolyzed residue with ethyl acetate. Free phenolic extracts had significantly higher (P < 0.05) DPPH* scavenging ability than the bound phenolic extracts, except in orange peels where the bound phenolic extracts had significantly higher (P < 0.05) DPPH* scavenging ability. Bound phenolics from orange peels had the highest ABTS* scavenging ability (6.09 mmol./TEAC g) and ferric reducing antioxidant properties (FRAP) (71.99 mg/GAE 100 g), while bound phenolics from shaddock peels had the least ABTS* scavenging ability (1.35 mmol./TEAC g) and FRAP (2.58 mg/GAE 100 g) . Bound phenolics from grapefruit peels had the highest OH* scavenging ability (EC₅₀ = 3.8 mg/ml), while bound phenolics from shaddock peels had the least (EC₅₀ = 16.1 mg/ml). The phenolics chelated Fe²⁺ and inhibited malondialdehyde production in rat’s pancreas in a dose-dependent manner. The additive and/or synergistic action of the free and bound phenolics could have contributed to the observed medicinal properties of the peels; therefore, the high antioxidant properties of the free and bound phenolic extracts from orange peels could be harness in the formulation of nutraceuticals and food preservatives.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3550823

DOI: 10.1007/s13197-010-0222-y
PubMed: 24293692
PubMed Central: 3550823

Affiliations:

Nigeria

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<front><div type="abstract" xml:lang="en"><p>This study sought to determine the distribution of free and bound phenolics in some Nigerian citrus peels [orange (<italic>Citrus sinensis</italic>
), grapefruit (<italic>Citrus paradisii</italic>
) and shaddock (<italic>Citrus maxima</italic>
)] and characterize the antioxidant properties. The free phenolics were extracted with 80% acetone, while the bound phenolics were extracted from the alkaline and acid hydrolyzed residue with ethyl acetate. Free phenolic extracts had significantly higher (<italic>P</italic>
 < 0.05) DPPH* scavenging ability than the bound phenolic extracts, except in orange peels where the bound phenolic extracts had significantly higher (<italic>P</italic>
 < 0.05) DPPH* scavenging ability. Bound phenolics from orange peels had the highest ABTS* scavenging ability (6.09 mmol./TEAC g) and ferric reducing antioxidant properties (FRAP) (71.99 mg/GAE 100 g), while bound phenolics from shaddock peels had the least ABTS* scavenging ability (1.35 mmol./TEAC g) and FRAP (2.58 mg/GAE 100 g) . Bound phenolics from grapefruit peels had the highest OH* scavenging ability (EC<sub>50</sub>
 = 3.8 mg/ml), while bound phenolics from shaddock peels had the least (EC<sub>50</sub>
 = 16.1 mg/ml). The phenolics chelated Fe<sup>2+</sup>
 and inhibited malondialdehyde production in rat’s pancreas in a dose-dependent manner. The additive and/or synergistic action of the free and bound phenolics could have contributed to the observed medicinal properties of the peels; therefore, the high antioxidant properties of the free and bound phenolic extracts from orange peels could be harness in the formulation of nutraceuticals and food preservatives.</p>
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Characterization of the antioxidant properties of phenolic extracts from some citrus peels

Characterization of the antioxidant properties of phenolic extracts from some citrus peels

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