Synthesis and antimicrobial activity of α-aminophosphonates containing chitosan moiety.

A novel series of α-aminophosphonates containing chitosan moiety was obtained in high yields from reactions of chitosan with aromatic aldehydes and triphenylphosphite in the presence of lithium perchlorate as a catalyst. The structures of the synthesized compounds were confirmed by IR and 1 H NMR spectral data. Compounds ( 1 – 4 ) showed high antimicrobial activities against Escherichia coli (NCIM2065), Serratia marcescens , Enterobacter cloacae , Shigella dysenteriae , Salmonella enterica and Proteus vulgaris as Gram-negative bacteria, Bacillus subtilis (PC1219) and Staphylococcus aureus (ATCC25292) as Gram-positive bacteria and Candida albicans as a fungus, at low concentrations (2.5–10 mg/mL). [ABSTRACT FROM AUTHOR]