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. 2009 Mar 3;14(3):970-8.
doi: 10.3390/molecules14030970.

Antioxidant activity and phenolic content of Paederia foetida and Syzygium aqueum

Hasnah Osman  1 , Afidah A Rahim, Norhafizah M Isa, Nornaemah M Bakhir
Affiliations

Antioxidant activity and phenolic content of Paederia foetida and Syzygium aqueum

Hasnah Osman et al. Molecules. .

Abstract

The antioxidant activity of fresh and dried plant extracts of Paederia foetida and Syzygium aqueum were studied using beta-carotene bleaching and the 2,2'-azinobis(3-ethyl-benzothiazoline-6-sulfonic acid) (ABTS) radical cation assay. The percentage of antioxidant activity for all extract samples using both assays was between 58 and 80%. The fresh samples of both plants had higher antioxidant activity than the dried samples. The results of the beta-carotene bleaching assay were correlated (R(2) = 0.9849) with those of the ABTS assay.

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Figures

Figure 1
Figure 1
Antioxidant activity of the different extracts and standard samples at 0.02 ppm in the β-carotene-linoleate system. Variations were significant at level p<0.05.
Figure 2
Figure 2
Values of free radical-scavenging activity of sample extracts in ABTS assay. Variations were significant at level p<0.05.
Figure 3
Figure 3
Free radical-scavenging activity of extract samples at different concentration using ABTS ‘assay’. (l)-(+) Ascorbic acid and quercetin were used as references.
Figure 4
Figure 4
Correlation between phenolic content and antioxidant activity.
See this image and copyright information in PMC

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