Documents disponibles écrits par cet auteur

Preparation and characterization of N - halamine - based antimicrobial fillers / Revathi V. Padmanabhuni in Industrial & engineering chemistry research, Vol. 51 N° 14 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 14 (Avril 2012) . - pp. 5148–5156 Titre : Preparation and characterization of N - halamine - based antimicrobial fillers Type de document : texte imprimé Auteurs : Revathi V. Padmanabhuni, Auteur ; Jie Luo, Auteur ; Zhengbing Cao, Auteur Année de publication : 2012 Article en page(s) : pp. 5148–5156 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Polymer  Composites  antimicrobial Résumé : The purpose of this study was to demonstrate that the surface of CaCO3 fillers can be coated with an N-halamine-based fatty acid to make the filler surface organophilic and simultaneously achieve antibacterial activity, rendering the resulting polymer–filler composites antimicrobial. Thus, a new bifunctional compound, 4,4-dimethylhydantoin undecanoic acid (DMH-UA), was synthesized by treating the potassium salt of dimethylhydantoin (DMH) with 11-bromoundecanoic acid (BUA). Upon chlorination treatment with dilute bleach, DMH-UA was transformed into 3-chloro-4,4-dimethylhydantoin undecanoic acid (Cl-DMH-UA). Alternatively, DMH-UA could be coated onto the surface of CaCO3 to obtain the corresponding calcium salt, 4,4-dimethylhydantoin undecanoic acid calcium carbonate (DMH-UA-CaCO3). In the presence of dilute chlorine bleach, the DMH-UA coated on the surface of CaCO3 was transformed into Cl-DMH-UA, leading to the formation of Cl-DMH-UA-CaCO3. The reactions were characterized by FT-IR, NMR, UV, DSC, and SEM analyses. Both Cl-DMH-UA and Cl-DMH-UA-CaCO3 were used as antimicrobial additives for cellulose acetate (CA). The antimicrobial efficacy of the resulting samples was evaluated against both Escherichia coli (Gram-negative bacteria) and Staphylococcus aureus (Gram-positive bacteria). It was found that, for the same additive content, CA samples with Cl-DMH-UA-CaCO3 and Cl-DMH-UA had very similar antimicrobial and biofilm-controlling activities, but the former released less active chlorine into the surrounding environment than the latter. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300212x [article] Preparation and characterization of N - halamine - based antimicrobial fillers [texte imprimé] / Revathi V. Padmanabhuni, Auteur ; Jie Luo, Auteur ; Zhengbing Cao, Auteur . - 2012 . - pp. 5148–5156. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 14 (Avril 2012) . - pp. 5148–5156 Mots-clés : Polymer  Composites  antimicrobial Résumé : The purpose of this study was to demonstrate that the surface of CaCO3 fillers can be coated with an N-halamine-based fatty acid to make the filler surface organophilic and simultaneously achieve antibacterial activity, rendering the resulting polymer–filler composites antimicrobial. Thus, a new bifunctional compound, 4,4-dimethylhydantoin undecanoic acid (DMH-UA), was synthesized by treating the potassium salt of dimethylhydantoin (DMH) with 11-bromoundecanoic acid (BUA). Upon chlorination treatment with dilute bleach, DMH-UA was transformed into 3-chloro-4,4-dimethylhydantoin undecanoic acid (Cl-DMH-UA). Alternatively, DMH-UA could be coated onto the surface of CaCO3 to obtain the corresponding calcium salt, 4,4-dimethylhydantoin undecanoic acid calcium carbonate (DMH-UA-CaCO3). In the presence of dilute chlorine bleach, the DMH-UA coated on the surface of CaCO3 was transformed into Cl-DMH-UA, leading to the formation of Cl-DMH-UA-CaCO3. The reactions were characterized by FT-IR, NMR, UV, DSC, and SEM analyses. Both Cl-DMH-UA and Cl-DMH-UA-CaCO3 were used as antimicrobial additives for cellulose acetate (CA). The antimicrobial efficacy of the resulting samples was evaluated against both Escherichia coli (Gram-negative bacteria) and Staphylococcus aureus (Gram-positive bacteria). It was found that, for the same additive content, CA samples with Cl-DMH-UA-CaCO3 and Cl-DMH-UA had very similar antimicrobial and biofilm-controlling activities, but the former released less active chlorine into the surrounding environment than the latter. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300212x