Antioxidative compounds isolated from the rhizomes of smaller galanga (Alpinia officinarum Hance)

Issue title: The Proceedings of the 3rd International Conference on Food Factors (ICoFF 03)

Article type: Research Article

Authors: Ngoc Ly, Tram | Shimoyamada, Makoto | Kato, Koji | Yamauchi, Ryo

Affiliations: Department of Applied Life Science, Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu City, Gifu 501-1193, Japan

Note: [] Corresponding author. Tel./Fax: +81 58 293 2930; E-mail: [email protected]

Abstract: Antioxidative compounds were isolated from the methanol extract of fresh rhizome of smaller galanga (Alpinia officinarum Hance). Seven phenylpropanoids (1–7) were obtained and their structures were elucidated by MS and NMR analyses. They comprised the two known compounds, (E)-p-coumaryl alcohol γ-O-methyl ether (1) and (E)-p-coumaryl alcohol (6); and the five novel compounds, stereoisomers of (4E)-1,5-bis(4-hydroxy-phenyl)-1-methoxy-2-(methoxymethyl)-4-pentene (2a and 2b), stereoisomers of (4E)-1,5-bis(4-hydroxyphenyl)-1-ethoxy-2-(methoxymethyl)-4-pentene (3a and 3b), (4E)-1,5-bis(4-hydroxy-phenyl)-1-[(2E)-3-(4-acetoxyphenyl)-2-propenoxy]-2-(methoxymethyl)-4-pentene (4), (4E)-1,5-bis(4-hydroxyphenyl)-2-(methoxymethyl)-4-penten-1-ol (5), and (4E)-1,5-bis(4-hydroxyphenyl)-2-(hydroxymethyl)-4-penten-1-ol (7). Compounds 1–7 were detected for the first time as constituents of galanga rhizomes and exhibited antioxidative activities against the autoxidation of methyl linoleate in bulk phase.

Keywords: antioxidant, phenylpropanoid, coumaryl alcohol, galanga, Alpinia officinarum Hance

Journal: BioFactors, vol. 21, no. 1-4, pp. 305-308, 2004