Natural compounds as potential algaecides for waterborne paints / Sandra G. Gomez de Saravia in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1191-1200 Titre : Natural compounds as potential algaecides for waterborne paints Type de document : texte imprimé Auteurs : Sandra G. Gomez de Saravia, Auteur ; Silvia E. Rastelli, Auteur ; Guillermo Blustein ; Marisa R. Viera Année de publication : 2018 Article en page(s) : p. 1191-1200 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Algicides Antimicrobiens Biomolécules Composés organiques Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : To eliminate and prevent the formation of phototrophic biofilms on painted walls, chemicals are added to paints. These chemicals, in general, also have toxic effects on the environment. Plants synthesize secondary metabolites which have antimicrobial properties and that may be a sustainable alternative to traditional biocides. In this work, algal species isolated from biofilms formed on deteriorated painted surfaces were taxonomically identified. Observations with the optical microscope revealed the presence of mixed biofilms composed of algae belonging to the Cyanophyta, Chlorophyta, and Streptophyta divisions. The algaecide effect of natural compounds of vegetal origin such as anisole, eugenol, guaiacol, and thymol was evaluated by the microatmosphere technique. Growth inhibition of phototrophic organisms was obtained with thymol in all the concentrations used. Eugenol and guaiacol showed a total growth inhibition at the highest concentration assayed (300 μmol cm−2) and a decrease in growth at 40 μmol cm−2, while anisole did not exert any inhibitory action at the assayed concentrations. Due to these results, eugenol, thymol, and guaiacol were incorporated in an exterior waterborne paint at a concentration of 2%. Samples painted with these formulations were not colonized by algae, indicating that these compounds could be used as biocides in paint formulations. Note de contenu : - MATERIALS AND METHODS : Source of algae - Taxonomic determination of algae and isolation of algal taxa - Microscopic observations - Natural organic compounds - Algaecide activity tests - RESULTS AND DISCUSSION : Taxonomic determination of algae in the sampled biofilms - Algaecide tests DOI : 10.1007/s11998-018-0099-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0099-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31149 [article]

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