Phytochimie et activité antioxydant du zeste de citron

Abstract

Methanolic extracts of lemon peels were tested for their antioxidant activities the phenolic compounds (total polyphenols and flavonoids) extracted by the extraction solvent (ethanol) show variations according to the extract and the variety, the evaluation of the In vitro antioxidant power revealed antioxidant capacities in all extracts. For this, several extraction methods were used: The first part of this study concerns the extraction and quantification of total phenols, flavonoids by the reagent of folin - ciocalteu, by aluminum trichloride The second part is the study of the antioxidant activity of plant extracts using techniques: Scavenging of the DPPH radical, The results obtained were very significant; the correlation between the antioxidant activity and the content of total phenolic compounds was also investigated. Our results showed that: The content of total polyphenols in the methanolic extracts shows different results which are 83.5; 91.33mg GAE/g ES, corresponding to lemon peel extract. The increase in gallic acid is proportional with the increase in the optical density of lemon peel extract. lemon peels have antioxidant activities that are significantly lower than that of the reference.