Antioxidant properties of selected Etlingera and Zingiber Species (Zingiberaceae) from Borneo Island

Sabli, F. and Mohamed, M. and Rahmat, A. and Ibrahim, H. and Abu Bakar, M.F. (2012) Antioxidant properties of selected Etlingera and Zingiber Species (Zingiberaceae) from Borneo Island. International Journal of Biological Chemistry, 6 (1). pp. 1-9. ISSN 1819-155X, DOI https://doi.org/10.3923/ijbc.2012.1.9.

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Abstract

In this study, total phenolic and flavonoid contents as well as antioxidant properties of methanolic extracts of rhizomes and stems of four Zingiberaceae (Etlingera belalongensis, Etlingera velutina, Zingiber vinosum and Zingiber pseudopungens) were investigated. Evaluation of antioxidant activity was conducted using 1,1-diphenyl-2-picrylhydrazyl free radical-scavenging (DPPH) assay, 2-2-azinobis-3-ethylbenzothioazaline-6-sulphonate radical scavenging (ABTS) assay and Ferric-Reducing Antioxidant Power (FRAP). The results showed the total phenolic and total flavanoid contents were in the range of 5.3-41.7 mg gallic acid equivalent/g and 1.09-5.86 mg catechin equivalent/g of dry sample, respectively. The antioxidant activities of the extracts as assessed by using DPPH and FRAP assays were strongly correlated with all phytochemical tested (p<0.05). As a conclusion, selected tropical gingers found in Sabah investigated in this study can be developed as natural antioxidant agents.

Item Type:	Article
Funders:	UNSPECIFIED
Uncontrolled Keywords:	Zingiberaceae; Antioxidant activity; Total phenolic contents; Total flavanoid
Subjects:	Q Science > Q Science (General)
Divisions:	Faculty of Science > Institute of Biological Sciences
Depositing User:	Ms. Jamilah Salleh
Date Deposited:	27 Oct 2014 03:23
Last Modified:	27 Oct 2014 03:23
URI:	http://eprints.um.edu.my/id/eprint/10068

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