Interprofessional Journal of Health Sciences. Vol.16 No.2 , July - December 2018.

ESSENTIAL OIL COMPOSITION AND ANTIOXIDANT ACTIVITY FROM ALPINIA SIAMENSIS K. SCHUM. RHIZOME

Orawan Theanphong, Thaya Jenjittikul, and Withawat Mingvanish

Abstract

The chemical compositions of hydrodistilled essential oils from different ages of fresh rhizome of A. siamemsis (6 and 9 month) were analysed by GC-MS technique.  1, 8-Cineole was obtained as the main component in both essential oils (20.49 and 29.68%, respectively). The antioxidant activities of two essential oils were evaluated by DPPH radical scavenging, hydroxyl radical scavenging, ferrous ion chelating, superoxide anion radical scavenging and ferric reducing power assays.  L-ascorbic acid and ethylenediaminetetraacetic acid (EDTA) were used as a positive control.  The DPPH radical scavenging activity and ferric reducing power of both of essential oils and L-ascorbic acid were found to be insignificantly different whereas the hydroxyl radical scavenging activity of the 6-month rhizome essential oil was found to be significantly higher than the 9-month rhizome essential oil and L-ascorbic acid.  The superoxide anion radical scavenging activities of the 6- and 9-month rhizome essential oils were found to be insignificantly different.  However, the 9-month rhizome essential oil had much higher superoxide anion radical scavenging activity than L-ascorbic acid.  Both of the essential oils showed less chelating activity for ferrous ions as compared with EDTA.

Keywords: Alpinia siamensis, Zingiberaceae, essential oil

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DOI: 10.14456/ijhs.2018.4