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Antimicrobial properties
of tropical plants against 12 pathogenic bacteria isolated
from aquatic organisms
Lee Seong Wei*,
Najiah Musa, Chuah Tse Sengm, Wendy Wee and Noor Azhar Mohd
Shazili
Department of Fisheries and Aquaculture, Faculty of
Agrotechnology and Food Science, University of Malaysia,
Terengganu, 21030, Kuala Terengganu, Malaysia.
*Corresponding author. E-mail:
leeseongwei@yahoo.com.
Accepted
17 January, 2008 |
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Disk diffusion technique was used to determine the
antibacterial activity of aqueous and methanolic extracts of
edible tropical plant against 12 clinical and pathogenic
bacterial strains isolated from aquatic animals. They were
Vibrio alginolyticus, Vibrio parahaemolyticus,
Vibrio harveyi, Vibrio vulnificus, Vibrio
cholerae, Escherichia coli, Citrobacter
freundii, Edwardsiella tarda, Aeromonas
hydrophilla, Salmonella sp., Schewanella
putrifaciens and Streptococcus sp. The zone of
inhibition varies depending on bacterial species and type of
extract. The average diameter of inhibition zones ranges
from without inhibition zone to 12 mm and without inhibition
zone to 11 mm for water and methanolic extract,
respectively. All the 9 plants tested showed antimicrobial
activity against one or more species of bacteria. The most
active antimicrobial plants were Colocasia esculenta,
Citrus microcarpa, Centella asiatica and
Morinda citrifolia.
Key
words:
Antimicrobial activity, edible plants, crude extract. |
