Walnut (Juglans regia) leaf extracts are strong scavengers of pro-oxidant reactive species

• Type: Article in International Scientific Journal
• Date: 2008

Authors

Isabel F Almeida (Author) FFUP; Eduarda Fernandes (Author) FFUP; Jose L F C Lima (Author) FFUP; Paulo C Costa (Author) FFUP; Maria Fernanda Bahia (Author) Other

Journal

Title: Food Chemistry

Vol. 106 No. 2

Pages: 1014-1020

ISSN: 0308-8146

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 93 Citations

Scopus - 110 Citations

Scientific classification

FOS: Agrarian Sciences > Other Agrarian Sciences

Other information

Authenticus ID: P-004-1QW

DOI: 10.1016/j.foodchem.2007.07.017

Abstract (EN): The growing interest in the substitution of synthetic food antioxidants by natural ones has fostered research on vegetable sources and on the screening of raw materials, for identifying new antioxidants. In the present study, an ethanol:water (4:6) extract from Juglans regia leaves was evaluated for its putative in vitro scavenging effects on reactive oxygen species (ROS) [hydroxyl radical (HO center dot), superoxide radical (O-2(center dot-)), peroxyl radical (ROO center dot) and hydrogen peroxide (H2O2)] and reactive nitrogen species (RNS) [nitric oxide ((NO)-N-center dot) and peroxynitrite anion (ONOO-)]. The extract presented a potent scavenging activity against all the reactive species tested, all the IC(50)s being found at the mu g/mL level. IC50S (mean SE) for the ROS O-2(center dot-) and H2O2 were 47.6 +/- 14.6, 383 +/- 17 mu g/mL, respectively. The oxygen radical absorbance capacity (ORAC) value obtained for ROO center dot was 2.17 +/- 0.22 mu mol Trolox equivalents/mg extract. The IC50S for (NO)-N-center dot and ONOO- were 1.95 +/- 0.29 and 1.66 +/- 0.10 mu g/mL, respectively. The content of total phenolics was 270 3 mg of gallic acid equivalents (GAE)/g of lyophilised extract. These results showed that J regia leaf extracts can be used as an easily accessible source of natural antioxidants.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7