Alkyl 2-furoates obtained by green chemistry procedures as suitable new antifoulants for marine protective coatings / Angélica Escobar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 1 (01/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 1 (01/2019) . - p. 159-166 Titre : Alkyl 2-furoates obtained by green chemistry procedures as suitable new antifoulants for marine protective coatings Type de document : texte imprimé Auteurs : Angélica Escobar, Auteur ; Miriam Pérez, Auteur ; Angel Sathicq, Auteur ; Monica Garcia, Auteur ; Analia Paola, Auteur ; Gustavo Romanelli, Auteur ; Guillermo Blustein, Auteur Année de publication : 2019 Article en page(s) : p. 159-166 Note générale : Bibliogr. Langues : Américain (ame) Catégories : 2-furoate d'alkyle Marines (peinture) Produits chimiques -- Suppression ou remplacement Revêtements antisalissures:Peinture antisalissures Salissures biologiques Index. décimale : 667.9 Revêtements et enduits Résumé : In search of new sustainable alternatives to reduce the use of metallic antifouling pigments in marine paints, three n-alkyl 2-furoates were synthesized by safe procedures framed within the green chemistry concepts. These compounds were characterized by current organic analysis, and their antifouling properties were first evaluated on Artemia salina nauplii in the laboratory. Then, antifouling paints formulated with these compounds were assayed in a marine environment. Both laboratory and field tests indicate that n-alkyl 2-furoates have strong antifouling activity and are safe chemicals for marine paints. Note de contenu : - GREEN SYNTHESIS OF ALKYL 2-FUROATES : General - Catalyst preparation - Synthesis of alkyl 2-furoates - ANTIFOULING ACTIVITY OF ALKYL 2-FUROATES : Laboratory bioassays - Paint preparation - Field trials - Statistical analysis - GREEN SYNTHESIS OF ALKYL 2-FUROATES - ANTIFOULING ACTIVITY OF ALKYL 2-FUROATES : Laboratory bioassays - Field trials - Table 1 : Composition of control paint expressed as weight percent - Table 2 : Mass spectra of alkyl 2-furoates - Table 3 : Reaction parameters of 2-furoic acid esterification (1) without catalyst; (2) first reuse; (3) second reuse - Table 4 : Toxicity test on Artemia sp. nauplii. Fifty lethal concentration (LC50) for each furoate DOI : 10.1007/s11998-018-0110-3 En ligne : https://link.springer.com/article/10.1007/s11998-018-0110-3 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31981 [article]

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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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