Chemical Composition of the Volatile Extract and Antioxidant Activities of the Volatile and Nonvolatile Extracts of Egyptian Corn Silk (Zea mays L.)

Ahmed El-Ghorab†, Khaled F. El-Massry† and Takayuki Shibamoto*‡
Flavor and Aroma Department, National Research Center, Dokki, Cairo, Egypt, and Department of Environmental Toxicology, University of California, Davis, California 95616
J. Agric. Food Chem., 2007, 55 (22), pp 9124–9127
DOI: 10.1021/jf071646e
Publication Date (Web): October 4, 2007
Copyright © 2007 American Chemical Society
†

National Research Center.

,
* To whom correspondence should be addressed: Department of Environmental Toxicology, University of California, One Shields Avenue, Davis, CA 95616. Phone: (530) 752-4523 . Fax: (530) 752-3394. E-mail: tshibamoto@ucdavis.edu.
,
‡

University of California.

Abstract

A total of 36 compounds, which comprised 99.4% of the extract, were identified by gas chromatography and mass spectrometry (GC–MS) in the volatile dichloromethane extract obtained from Egyptian corn silk. The main constituents of the volatile extract were cis-α-terpineol (24.22%), 6,11-oxidoacor-4-ene (18.06%), citronellol (16.18%), trans-pinocamphone (5.86%), eugenol (4.37%), neo-iso-3-thujanol (2.59%), and cis-sabinene hydrate (2.28%). Dried Egyptian corn silk was also directly extracted with petroleum ether, ethanol, and water. All extracts from solvent extraction and the volatile extract described above exhibited clear antioxidant activities at levels of 50–400 µg/mL in the 2,2-diphenyl-1-picrylhydrazyl (DPPH)/linoleic acid assay. The ethanol extract inhibited DPPH activity by 84% at a level of 400 µg/mL. All samples tested via the β-carotene bleaching assay also exhibited satisfactory antioxidant activity with clear dose responses. This study indicates that corn silk could be used to produce novel natural antioxidants as well as a flavoring agent in various food products.

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History

  • Published In Issue October 31, 2007
  • Article ASAPOctober 04, 2007
  • Received: June 05, 2007
    Accepted: August 28, 2007
    Revised: August 27, 2007

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