Antioxidant Activity of the Phenolic Leaf Extracts from <Emphasis Type="Italic">Monechma ciliatum</Emphasis> in Stabilization of Corn Oil |
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| Authors: | Abdalbasit Adam Mariod Ramlah Mohamad Ibrahim Maznah Ismail Norsharina Ismail |
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| Affiliation: | (1) Laboratory of Molecular Biomedicine, Institute of Bioscience, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia;(2) Department of Nutrition and Dietetics, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia;(3) Department of Food Science and Technology, Sudan University of Science and Technology, P. O. Box 71, Khartoum North, Sudan |
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| Abstract: | The total phenolic content and the antioxidant potential of methanolic extract (ME), ethyl acetate extract (EAE), and hexane
extract (HE) from Monechma ciliatum leaves (MCL) were evaluated. The Folin-Ciocalteu, β-carotene bleaching, the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical
scavenging and the accelerated oxidation methods were used for evaluation. Both the extraction yield and the antioxidant activity
(AOA) were strongly dependent on the solvent. Among the extracts, ME exhibited highest total phenolic compounds (TPC) and
IC50 values for DPPH, followed by EAE and HE, respectively. Peroxide value (PV), anisidine value (AV) conjugated dienes (CD),
and thiobarbituric acid reactive substances (TBARS) were taken as the parameters for evaluation of stabilization efficacy
of MCL extracts and results revealed MCL to be a potent antioxidant for the stabilization of corn oil. As a general trend,
increased AOA was observed for increased extract concentration. The predominant phenolic compounds identified by HPLC-DAD
in MCL extracts were p-coumaric acid, vanillin and ferulic acid. |
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