Vol. 127 No. 1
Antimicrobial Activity of Nine
Plants in Kerala, India
V. K. Sasidharan, T. Krishnakumar and C. B. Manjula
Nine common plants, namely, Aegle marmelos (L.) Corr., Leucas indica
(L.) Vatka, Murraya konigii (L.) Spreng., Tamarindus indica (L.) Pachyptera
alliacea (Lam.) A. Gentry, Eupatorium odoratum (L.), Moringa oleifera
(Lamk.), Cinnamomum veerum (Preal) and Cymbopogon citratus (DC) Stapf.
which are indigenously used in Kerala, India for curing various infections
were tested against a fungus (Aspergillus niger ) and Gram positive
and negative bacteria (Staphylococcus aureus and Escherichia coli, respectively).
Except for A. marmelos, all of the aqueous and alcoholic extracts of
the plants at 5.0% concentration inhibited the growth of the microorganisms.
The diameter (cm) of the inhibition zones of the 5.0% aqueous extracts
ranged from 0.8 to 1.6 cm in A. niger and 1.0 to 1.4 cm in both
S. aureus and E. coli. Under the same concentration of alcoholic extracts,
the inhibition zones have diameters ranging from 0.9 to 1.8, 1.0 to
1.8, and 1.0 to 2.0 cm for A. niger, S. aureus and E. coli , respectively.
Alcoholic extracts of plants were consistently found to be more inhibitory
than aqueous extracts of the same concentration. The alcoholic extracts
(5.0%) of L. indica and C. citratus has the highest
antifungal activity while E. odoratum has the greatest activity
against both S. aureus and E. coli.
Key words: Leucas indica, Cymbapogan citraus, Eupatorium odoratum,
antibacterial activity, antifungal activity, aqueous extract, alcoholic