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Targeting excessive free radicals with peels and juices of citrus fruits: Grapefruit, lemon, lime and orange

2009; Elsevier BV; Volume: 48; Issue: 1 Linguagem: Inglês

10.1016/j.fct.2009.09.022

1873-6351

Rafaela Guimarães, Lillian Barros, João C.M. Barreira, Ma João Sousa, Ana Maria Carvalho, Isabel C.F.R. Ferreira,

Essential Oils and Antimicrobial Activity

A comparative study between the antioxidant properties of peel (flavedo and albedo) and juice of some commercially grown citrus fruit (Rutaceae), grapefruit (Citrus paradisi), lemon (Citrus limon), lime (Citrus × aurantiifolia) and sweet orange (Citrus sinensis) was performed. Different in vitro assays were applied to the volatile and polar fractions of peels and to crude and polar fraction of juices: 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging capacity, reducing power and inhibition of lipid peroxidation using β-carotene–linoleate model system in liposomes and thiobarbituric acid reactive substances (TBARS) assay in brain homogenates. Reducing sugars and phenolics were the main antioxidant compounds found in all the extracts. Peels polar fractions revealed the highest contents in phenolics, flavonoids, ascorbic acid, carotenoids and reducing sugars, which certainly contribute to the highest antioxidant potential found in these fractions. Peels volatile fractions were clearly separated using discriminant analysis, which is in agreement with their lowest antioxidant potential.