Synthesis and photobactericidal properties of a neutral porphyrin grafted onto lignocellulosic fibers.

Photodynamic antimicrobial chemotherapy (PACT), as one of the promising alternative antimicrobial treatment, has received great attention in recent years. In this work, a new antimicrobial material has been elaborated by grafting a neutral porphyrin, the metallated 5-(4-azidophenyl)-10,15,20-triphenylporphyrin, onto lignocellulosic fibers by using the Copper (I)-Catalyzed Alkyne-Azide 1,3-dipolar Cycloaddition (CuAAC) reaction. The cross-linked porphyrin-Kraft pulp material was characterized by infrared and by XPS spectroscopy analyses, which proved the covalent linkage between the porphyrin and propargylated Kraft pulp fibers.

Crosslinked cellulose developed by CuAAC, a route to new materials.

This work deals with a novel and simple approach of cellulose reticulation using the Huisgen 1,3-dipolar cycloaddition, also known as a 'click chemistry' reaction, catalysed by copper and developed by Sharpless. This reaction is carried out by the addition of a true alkyne and an azide to form a triazole ring connecting the two polysaccharide chains. The addition of two different functions will allow us to control the crosslinking reaction, to avoid intra-chain reactions and thus to promote the creation of an enhanced three-dimensional network.