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Molecules 2011, 16(8), 6378-6395; doi:10.3390/molecules16086378
Article

Antioxidant Capacities and Total Phenolic Contents Increase with Gamma Irradiation in Two Types of Malaysian Honey

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Received: 25 May 2011 / Revised: 21 July 2011 / Accepted: 25 July 2011 / Published: 27 July 2011
(This article belongs to the Section Metabolites)
Download PDF [469 KB, 18 June 2014; original version 18 June 2014]

Abstract

Two types of monofloral Malaysian honey (Gelam and Nenas) were analyzed to determine their antioxidant activities and total phenolic and flavonoid contents, with and without gamma irradiation. Our results showed that both types of honey can scavenge free radicals and exhibit high antioxidant-reducing power; however, Gelam honey exhibited higher antioxidant activity (p < 0.05) than Nenas honey, which is in good correlation (r = 0.9899) with its phenolic contents. Interestingly, we also noted that both irradiated honeys have higher antioxidant activities and total phenolic and flavonoid contents compared to nonirradiated honeys by Folin-Ciocalteu and UV-spectrophotometry methods, respectively. However, HPLC analysis for phenolic compounds showed insignificant increase between irradiated and nonirradiated honeys. The phenolic compounds such as: caffeic acid, chlorogenic acid, ellagic acid, p- coumaric acid, quercetin and hesperetin as indicated by HPLC method were found to be higher in Gelam honey versus Nenas honey. In conclusion, irradiation of honey causes enhanced antioxidant activities and flavonoid compounds.
Keywords: Gelam honey; Nenas honey; antioxidant activity; phenolics; gamma irradiation Gelam honey; Nenas honey; antioxidant activity; phenolics; gamma irradiation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Hussein, S.Z.; Yusoff, K.M.; Makpol, S.; Yusof, Y.A.M. Antioxidant Capacities and Total Phenolic Contents Increase with Gamma Irradiation in Two Types of Malaysian Honey. Molecules 2011, 16, 6378-6395.

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