Lichens are well known for their
peculiar, crystalline aromatic constituents that accumulate on the
thallus. Lichen compounds are also known
to show some biological activities against microorganisms.
The present paper describes the
extraction and antibacterial activity of various solvent extracts of
lichen Ramalina hossei Vain.
(Ramalinaceae), against Gram positive and Gram negative bacteria.
The dried and powdered lichen material
was extracted with solvents namely methanol, chloroform and
petroleum ether and the solvent extracts
were subjected to antibacterial activity using Kirby Bauer
method. Chemical tests revealed the
presence of Usnic acid and sekikaic acid aggregates. The
extracts were found to possess more
activity against Gram positive bacteria than Gram negative
bacteria. Among solvent extracts,
methanol extract showed more inhibition of test bacteria than
others. From the results, it could be
concluded that the lichen selected for the study possess active
antimicrobial principles. The results are
in justification with the folkloric uses of lichen extracts.
Author (s)
Details
K. S. Vinayaka
Plant Biology Lab., Department of
Botany, Sri Venkataramana Swamy College, Vidyagiri, Bantwal-574211, Dakshina
Kannada, Karnataka, India.
T. R. Prashith Kekuda
Department of Microbiology,
S.R.N.M.N College of Applied Sciences, NES Campus, Balraj Urs Road, Shivamogga-577201,
Karnataka, India.
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