Enhanced Antioxidant Activity in Wet Mill Nanostructured Zingiber officinale (Ginger) Rosc Rhizome

Abstract:

In this study, the effect of nanonization on antioxidant activity of Zingiber officinale (ginger) Ross rhizome prepared using a wet milling process were investigated. The antioxidant activity was estimated based on the Total Phenolic Content (TPC) and Total Flavonoid Content (TFC) and measured using FRAP, ABTS and DPPH assays. Particle size of the initial ginger rhizome (approximately 20μm) was successfully reduced to 222.3 nm after the wet milling process. Higher degree of granules surface destruction occurred as a result of nanonization process based on FESEM image. Findings revealed that nanostructured ginger (NG) had the highest TPC and TFC which were 946.43 mgGAE/g and 20.16 mgQE/g followed by submicron ginger (SM) (712.68 mgGAE/g; 16.22 mgQE/g) and micron ginger (MG) (700.89 mgGAE/g; 14.45 mgQE/g) of dry matter respectively. Moreover, NG rhizome showed around 30 to 40% (p<0.05) greater radical scavenging activity as well as ferric reducing antioxidant power as compared to the other samples tested. The antioxidant activity was in the following in sequence: NG>SM>MG. Hence it can be concluded that reduction of particle size of ginger rhizome into nanoparticles using a wet milling process enhanced its antioxidant activity as compared to micron and submicron particles.

• Periodical: Advanced Materials Research (Volume 832)
• Pages: 551-556
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.832.551
• Online since: November 2013
• Authors: A. Norhidayah, A. Noriham, Mohamad Rusop
• Keywords: Antioxidant, Nanostructured, Wet Milling, Zingiber officinale Rosc

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