Alias, Nur Nadzifah Che
(2005)
Studies on the antioxidant properties of
selected Malaysia "ULAMS".
Masters thesis, Universiti Sains Malaysia.
Abstract
The antioxidant activity of some edible Malaysian ulams found in
Kelantan, Malaysia, was studied. The ulams studied were Oroxylum indicum
(Beka), Apium graveo/ens (Sup/Sadri), and Vitex negundo (Lemuni). Percent
recovery of the prepared ulam extracts was ranged from 2.47 to 2.54%. the
methanolic extracts of the ulams at 0.2 mg/ml concentration level was tested
using the autoxidation of lipid assay in a water-alcohol system, 0.40 mg/ml for
DPPH radical scavenging assay and 2.50 g/ml for xanthine/xanthine oxidase
(X/XOD) superoxide scavenging test. For the autoxidation of lipid (ML) assay in
a water-alcohol system, 2, 6-di-tertbutylhydroxytoluene (BHT), a synthetic
antioxidant, was used as standard antioxidant. It was found that both Oroxylum
indicum (Beka) and Vitex negundo (Lemuni) possessed high antioxidant activity
(92.9% and 92.9% for xanthine/xanthine oxidase superoxide scavenging test
and 98.4% and 98.6% for DPPH radical scavenging assay, respectively). The
decreasing order of antioxidant activity for inhibition of lipid autoxidation was
observed as Vitex negundo (Lemuni) > Oroxylum indicum (Beka) > Apium
graveolens (Sup/Sadri). Though all the test system did not yield the identical
order of antioxidant activity but there was a similarity. However, irrespective of
the type of the test carried out, the antioxidant activity of Vitex negundo
(Lemuni) was found appreciably high. Therefore, it is worth to study further with
the ulams for the present study, especially with Vitex negundo (Lemuni) and the
outcome of the study can be of importance in dietary control of diseases.
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