Resumo

ROJANO, Benjamín Alberto; ZAPATA ACOSTA, Karol  e  CORTES CORREA, Farid B. Free radical trapping capacity of Passiflora mollissima (Kunth) L. H. Bailey (curuba). Rev Cubana Plant Med [online]. 2012, vol.17, n.4, pp.408-419. ISSN 1028-4796.

Introduction: Colombia has a large number of exotic species with unexploited agroindustrial potential as a source of future income. Passiflora is the biggest Passifloraceae family, including about 500 species that do not have high content of polyphenolic compounds with antioxidant properties, except for Passiflora mollissima (Kunth) L.H.Bailey (curuba), a fruit with high antioxidant capacity. Objectives: to determine the ability of aqueous extracts to trap reactive oxygen species in curuba fruits from the region of Antioquia, Colombia. Methods: the contents of phenols, flavonoids and tannins were determined by spectrophotometric methods. The phenolic acids were determined by high-pressure liquid chromatography. The ability to trap free peroxyl radicals was measured by hydrophilic and lipophilic fluorescent ORAC (oxygen radical absorbance capacity) methods. The ability to trap total reactive oxygen species and hydroxyls, and superoxide radicals were ascertained by fluorescent methods and by spectrophotometry respectively. Results: aqueous extracts of passion fruit are polyphenol-rich, particularly tannins, flavonoids and phenolic acids. They also have a high capacity to trap the various reactive oxygen species, especially the radical ROO•, with an ORAC value of 108164.9 mmol Trolox/100 g of dry pulp, which is higher than in most fruits and vegetables. Conclusions: the aqueous extract of passion fruit has high nutraceutical potential due to the polyphenol content that directly affects their ability to trap reactive oxygen species radicals.

Palavras-chave : passion fruit; Passiflora mollissima; free radicals; ORAC.

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