title: Amine and ammonium functionalization of chloromethylsilane-ended dendrimers. Antimicrobial activity studies.
abstract: Novel amine- and ammonium-terminated carbosilane dendrimers of type G(n)-[Si{CH(2)O-(C(6)H(4))-3-NMe(2)}](x) or G(n)-[Si{CH(2)O-(C(6)H(4))-3-NMe(3)(+)I(-)}](x) have been synthesized and characterized up to second generation by phenolysis of (chloromethyl)silyl-terminated dendrimers with 3-dimethylamine phenol and subsequent quaternization with methyl iodide. Quaternized carbosilane dendrimers are stable in protic solvents and can be solubilised in water after the addition of less than 1% of dimethyl sulfoxide. A study of the antimicrobial activity of these cationic dendrimers of first and second generation against both gram-positive and gram-negative bacteria is also described. The results obtained demonstrate that the new ammonium-terminated carbosilane dendrimers can be considered as multivalent biocides.
authors.affiliation: Departamento de Química Inorgánica, Universidad de Alcalá, Campus Universitario, E-28871 Alcalá de Henares, Spain.
authors.forename: Paula
authors.initials: P
authors.lastname: Ortega
authors.forename: Jose Luis
authors.initials: JL
authors.lastname: Copa-Patiño
authors.forename: Ma Angeles
authors.initials: MA
authors.lastname: Muñoz-Fernandez
authors.forename: Juan
authors.initials: J
authors.lastname: Soliveri
authors.forename: Rafael
authors.initials: R
authors.lastname: Gomez
authors.forename: F Javier
authors.initials: FJ
authors.lastname: de la Mata
mesh_terms: D000588:Amines / Q000737:chemistry*; D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D050091:Dendrimers / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D004926:Escherichia coli / Q000187:drug effects; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D017646:Organosilicon Compounds / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D013211:Staphylococcus aureus / Q000187:drug effects; D013329:Structure-Activity Relationship
chemical_list: D000588:Amines; D000900:Anti-Bacterial Agents; D050091:Dendrimers; D017646:Organosilicon Compounds; D000644:Quaternary Ammonium Compounds