Antimicrobial activities of Anabaena wisconsinense
extracts Methanolic extract of Anabaena wisconsinense inhibited the
growth both Gram negative and Gram positive bacteria except
Lactobacillus species and the diameter of the zones of inhibition
varied from maximum of 50 to a minimum of 30 mm in P.
anguilliseptica and P. fluorescens, respectively. The inhibition
zone with Aspergillus niger was 20 mm in diameter in case of
methanolic extraction of Anabaena. Chloroform and ethanol
extracts of A. wisconsinense were not as effective. Ethanolic
extract of A. wisconsinense gave inhibition zones 34, 24 and
12 mm diameter with Aeromonas hydrophilia, B. firmus and P.
fluorescens while the zone of inhibition was 26 mm with A. niger.
However, Saprolegnia parasitica was not inhibited by all algal
extracts (Table 2).