Algal inhibitory efficiency of secondary metabolites of Tamarindusindica and Azadirachtaindica – A comparative pilot scale study

This study includes isolation of oil producing algae (Anabaena, Nostoc. Spirulina, Diatom, Volvox, Spirogyra) and subjecting the mixture of algae to the sun dried pulp extract of Tamarindusindica to observe inhibitory effect of secondary metabolites on algal growth. The comparative analysis of inhibiting efficiency was done between the extracts of Tamarindusindica and Azadirachtaindica which proved that the secondary metabolites of Azadirachtaindica are more efficient than the secondary metabolites of Tamarindusindicain inhibiting the growth of algae. 100% and 75% concentration of the crude extracts were used to evaluate the inhibitory effect. Contamination from bacteria and fungi was prevented by maintaining the pH at 8.5. The extract of the sun dried pulp of Tamarindusindica showed inhibitory activity against the above mentioned species of algae.