Abstract:
The inhibitory effect of
Ulva
lactuca
(Chlorophyta),
Dilophus
spiralis
(Phaeophyta) and
Jania
rubens
(Rhodophyta) marine algae species ha
s been evaluated against 2 Gram
-
positive bacterial (
Streptococcus pyogenes
and
Micrococcus luteus
); 2 Gram
-
negative
bacterial (
Shigella flexneri
and
Vibrio cholerae
) and 2 fungal (
Candida albicans
and
Aspergillus niger
) isolates using aqueous and six organ
ic extracts (methanol, ethanol,
chloroform, acetone, ethyl acetate and hexane). Data revealed that the
M. luteus
bacteria
was the most sensitive pathogen by showing the highest zone of inhibitions (ZIs) of 17 mm
with the lowest Minimum Inhibitory Concentra
tion (MIC) of 26.7 μgmL
-
1
and the lowest
Minimum Bactericidal Concentration (MBC) of 53.3 μg mL
-
1
with chloroform
D. spiralis
extract. Whereas, aqueous extracts were not active against all selected pathogens
regardless of the examined algae species. Based
upon data presented herein, chloroform
D. spiralis
extract was the most active against examined pathogens. Thereby, future
performance research in
D. spiralis
is requested due to their high effectiveness as a cheap
antimicrobial agent.
Keywords:
Algae, Ant
imicrobial activity, Minimum Bactericidal Concentration (MBC),
Minimum Inhibitory Concentration (MIC).
