Antioxidant properties of different cultivars of Portulaca oleracea

Yau Yan Lim, Elaine P L Quah

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    Abstract

    Methanolic extracts of six cultivars of Portulaca oleracea were analyzed for their total phenol content (TPC) using the Folin-Ciocal-teu method. The antioxidant activity was measured using the 1,1-diphenyl-2-picrylhydrazyl, ferric-reducing antioxidant power (FRA-P) and P-carotene bleaching (BCB) assays. The iodine titration method was used to determine the ascorbic acid content (AAC). The TPC of the cultivars of P. oleracea ranged from 127 +/- 13 to 478 +/- 45 mg GAE/100 g of fresh weight of plant. There was good correlation between the TPC value and its AEAC, IC50 and FRAP values (r(2) > 0.9) for all the cultivars. The AAC for the cultivars ranged from 38.5 +/- 10.6 to 73.0 +/- 17.5 mg/100 g. The TPC value of the common variety PO1, was the lowest compared to the ornamental cultivars (P02-PO6). The BCB assay showed that all cultivars were capable of inhibiting lipid peroxidation and the inhibition power did not correlate with TPC value. (c) 2006 Elsevier Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)734 - 740
    Number of pages7
    JournalFood Chemistry
    Volume103
    Issue number3
    Publication statusPublished - 2007

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