| Autor: |
Merino D; Grupo de Materiales Compuestos Termoplásticos (CoMP), Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA) , Universidad Nacional de Mar del Plata-Concejo Nacional de Investigaciones Científicas y Técnicas (CONICET) , Colon 10890 , 7600 Mar del Plata , Argentina., Mansilla AY; Instituto de Investigaciones Biológicas, UE CONICET-UNMdP, Facultad de Ciencias Exactas y Naturales , Universidad Nacional de Mar del Plata , Deán Funes 3250 , 7600 Mar del Plata , Argentina., Casalongué CA; Instituto de Investigaciones Biológicas, UE CONICET-UNMdP, Facultad de Ciencias Exactas y Naturales , Universidad Nacional de Mar del Plata , Deán Funes 3250 , 7600 Mar del Plata , Argentina., Alvarez VA; Grupo de Materiales Compuestos Termoplásticos (CoMP), Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA) , Universidad Nacional de Mar del Plata-Concejo Nacional de Investigaciones Científicas y Técnicas (CONICET) , Colon 10890 , 7600 Mar del Plata , Argentina. |
| Abstrakt: |
Clay-based nanocomposites (nanoclays) are interesting systems to hold a wide type of active substances with a wide field of industrial applications. Bentonite-chitosan nanoclay was obtained via cationic exchange of natural bentonite (Bent) with an aqueous solution of chitosan (CS). Their physicochemical and morphological properties were discussed under the light of Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy. Bent-CS characterization indicated that CS was intercalated in 10% (w/w). This polycationic polymer was oriented mostly in a monolayer arrangement, interacting by electrostatic forces between Bent sheets. The antimicrobial action of Bent-CS nanoclay was assayed onto phytopathogens, the bacterium model Pseudomonas syringe pv. tomato DC3000 ( Psy) and the necrotrophic fungus Fusarium solani f. sp. eumartii ( F. eumartii). In addition to demonstrating cell death on both microorganisms, Bent-CS exerted elicitor property on tomato plantlets. The biological actions of this natural nanomaterial might make it proper to be used in crops. |
