NATURAL ANTIBIOFOULING AGENTS AS NEW CONTROL METHOD FOR PHOTOTROPHIC BIOFILMS DWELLING ON MONUMENTAL STONE SURFACES.

Five natural antibiofoulanis with terrestrial (capsaicine - CS, cinnatnaldehyde - Cl) and marine origin (zosteric acid - ZA, poly-alkylpyridinium salts - pAPS and Ceramium bofryocarpum extract - CBE) have been selected and tested against phototrophic biojilin formation on the stone surfaces for their inhibitory properties. The antibiofouling agents (ABAs) were incorporated into two commercial silicone based coatings (Silres BS OH 100 - S and Silres BS 290 - W). in this work, pholotrophic growth was evaluated by epifluorescence microscopy and semi-quantitative image analysis. The results showed on inhibitory efficiency for almost all tested ABAs. However, this efficiency has been found for short time or when the incorporating agent were incompletely cured. Among the ABAs tested, the poly-alkylpyridinium salts and cinnamaldehyde incorporated into Silres BS 290 showed the best inhibitory efficiency. [ABSTRACT FROM AUTHOR]