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Int J Mol Sci. 2012;13(8):10257-67. doi: 10.3390/ijms130810257. Epub 2012 Aug 16.

Evaluation of antioxidant properties and mineral composition of Purslane (Portulaca oleracea L.) at different growth stages.

Author information

1
Institute of Tropical Agriculture, University Putra Malaysia, Serdang 09800, Malaysia; E-Mail: razi@agri.upm.edu.my.

Abstract

The main objective of this research was to appraise the changes in mineral content and antioxidant attributes of Portulaca oleracea over different growth stages. The antioxidant activity was measured using 1,1-diphenyl-2-picrylhydrazyl (DPPH), ferric-reducing antioxidant power (FRAP) assays. The iodine titration method was used to determine the ascorbic acid content (AAC). DPPH scavenging (IC(50)) capacity ranged from 1.30 ± 0.04 to 1.71 ± 0.04 mg/mL, while the ascorbic acid equivalent antioxidant activity (AEAC) values were 229.5 ± 7.9 to 319.3 ± 8.7 mg AA/100 g, total phenol content (TPC) varied from 174.5 ± 8.5 to 348.5 ± 7.9 mg GAE/100 g. AAC 60.5 ± 2.1 to 86.5 ± 3.9 mg/100 g and FRAP 1.8 ± 0.1 to 4.3 ± 0.1 mg GAE/g. There was good correlation between the results of TPC and AEAC, and between IC(50) and FRAP assays (r(2) > 0.9). The concentrations of Ca, Mg, K, Fe and Zn increased with plant maturity. Calcium (Ca) was negatively correlated with sodium (Na) and chloride (Cl), but positively correlated with magnesium (Mg), potassium (K), iron (Fe) and zinc (Zn). Portulaca olerecea cultivars could be used as a source of minerals and antioxidants, especially for functional food and nutraceutical applications.

KEYWORDS:

antioxidant; ascorbic acid content (AAC); ferric-reducing antioxidant power (FRAP); mineral composition; purslane

PMID:
22949859
PMCID:
PMC3431857
DOI:
10.3390/ijms130810257
[Indexed for MEDLINE]
Free PMC Article

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