Antioxidant activity of natural pigment from husk of coconut
2018
Noor Asiah H. | Nur Asma Fhadhila, Z. | Aziah M. Y. | Rodiah M. H. | Kawasaki, N.
Coconuts grow abundantly in the coastal areas of tropical countries. About 33-35% of the coconut is made of husk which includes mesocarp and exocarp. In Malaysia, the coconut husk is available in large quantities as the residue from coconut production. In previous works, natural pigments from the exocarp and mesocarp were extracted using microwave-assisted extraction. The current study was aimed at investigating the antioxidant activities of these pigments extracts. Quantitative determination of total phenolics and antioxidant capacities of these extracts were assayed for their ability to scavenge DPPH radicals and chelate ferrous ion. The total phenolic content, expressed as mg of gallic acid equivalent (GAE) per gram of extract, was found to be 32.24 mg GAE/g and 8.63 mg GAE/g in the mesocarp and exocarp respectively. The radical scavenging activity measurement, expressed in terms of mmol Trolox equivalent (TE) per gram of extract, was significantly (p<0.05) higher in the mesocarp (119.96 mM TE/g) compared with the exocarp (55.27 mM TE/g). Meanwhile, the reducing ability showed significantly (p<0.05) higher value in the mesocarp extract (751.89 mM Fe2+/g) compared with the exocarp extract (264.36 mM Fe2+/g). Thus, this study indicated the possible use of pigment extract as a source of natural antioxidant, which has great potential in the food industry and medicinal applications.
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