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Friday, 9 December 2016

Evaluation of extracts and essential oil from Callistemon viminalis leaves: Antibacterial and antioxidant activities, total phenolic and flavonoid contents

Published Date
doi:10.1016/S1995-7645(13)60139-X
Open Access, Creative Commons license, Funding information

Document heading

Author 
  • Mohamed ZM Salem a,,
  • Hayssam M Ali b,e
  • Nader A El-Shanhorey c
  • Ahmed Abdel-Megeedb,d

  • aForestry and Wood Technology Department, Faculty of Agriculture (EL-Shatby), Alexandria University, Alexandria, Egypt
    aBotany and Microbiology Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
    aDepartment of Botanical Gardens Research, Horticultural Research Institute (ARC), Alexandria, Egypt
    aFaculty of Agriculture (Saba Basha), Alexandria University, Egypt
    aTimber Trees Research Department, Sabahia Horticulture Research Station, Horticulture Research Institute, Agriculture Research Center, Alexandria, Egypt
    Received 5 May 2013. Revised 6 June 2013. Accepted 10 June 2013. Available online 19 July 2013. 

    Abstract

    Objective

    To investigate antioxidant and antibacterial activities of Callistemon viminalis (C. viminalis) leaves.

    Methods

    The essential oil of C. viminalis leaves obtained by hydro-distillation was analyzed by GC/MS. Different extracts were tested for total phenolic and flavonoid contents and in vitro antioxidant (DPPH assay) and antibacterial (agar disc diffusion and 96-well micro-plates methods) actives.

    Results

    Fourteen components were identified in the essential oil, representing 98.94% of the total oil. The major components were 1,8-cineole (64.53%) and α-pinene (9.69%). Leaf essential oil exhibited the highest antioxidant activity of (88.60±1.51)% comparable to gallic acid, a standard compound [(80.00±2.12)%]. Additionally, the biggest zone of inhibitions against the studied bacterial strains was observed by the essential oil when compared to the standard antibiotic (tetracycline). The crude methanol extract and ethyl acetate fraction had a significant antibacterial activity against the tested bacterial strains.

    Conclusions

    It can be suggested that C. viminalis is a great potential source of antibacterial and antioxidant compounds useful for new antimicrobial drugs from the natural basis. The present study revealed that the essential oil as well as the methanol extracts and ethyl acetate fraction of C. viminalis leaves exhibited highly significant antibacterial activity against the tested bacterial strains.

    Keywords

  • Callistemon viminalis
  • Essential oil
  • Antibacterial activity
  • Antioxidant activity
  • Phenolic content
  • Flavonoid content

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    • Available online 20 October 2013
      Foundation project: This work was funded by the Deanship of Scientific Research at King Saud University with the research group project No. RGP-VPP-010.
    • *
      Corresponding author: Mohamed Z.M. Salem, Forestry and Wood Technology Department, Faculty of Agriculture (EL-Shatby), Alexandria University, Alexandria, Egypt. Tel: +2 01012456137, Fax: +2 203-5922780
    Copyright © 2013 Hainan Medical College. Published by Elsevier (Singapore) Pte Ltd.
    Open access funded by Hainan Medical College

    For further details log on website :
    http://www.sciencedirect.com/science/article/pii/S199576451360139X
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