Synthesis, Characterization and Antimicrobial Properties of Polyaniline Encapsulated Azo Dyes

Polyaniline encapsulated azo dyes were synthesized from polyaniline obtained by oxidative polymerization of aniline and different azo dyes obtained from 2-aminothiophene intermediates. Two different polyaniline encapsulated azo dyes were synthesized and there molecular weight ranges from from 58,044- 58,128g/mol. The melting points were found to be from 286°C- 319°C. Spectroscopic assessment such as FT-IR spectroscopy and GC-MS were carried out to elucidate the structures of the synthesized polyaniline encapsulated azo dyes. The FT-IR spectra of the polyaniline encapsulated azo dyes showed absorption peaks in the range 3213.0- 3242.8cm-1 due to the presence of an amino group, The benzenoid and quinoid rings for all the polyaniline encapsulated azo dyes appeared in the range 1461-1487cm-1 and 1543-1595cm-1 respectively while the carbon nitrogen single bond (C-N) absorption were found in the range 1263.6-1285cm-1. For the assessment of the antimicrobial properties of the synthesized polyaniline encapsulated azo dyes different microorganism such as Staphylococcus aureus, Salmonella typhi, Candida albican, and Aspergillus niger were selected based on their pharmacological incidence and Agar well diffusion method was used. The result of the antimicrobial studies showed zones of inhibition ranging from 14-34mm. The strong activities of the synthesized polyaniline encapsulated azo dyes against staphylococcus aureus, Salmonella typhi, and candida albican showed that it may be effective against infectious diseases which these microorganism cause. The MIC value of 12.5mg/ml and MBC/MBF value of 12.5mg/ml of the synthesized polyaniline encapsulated Dye A and Dye B had activities against staphylococcus aureus and Salmonella typhi as compared to polyaniline and the dyes individually.