Magnetically responsive antibacterial nanocrystalline jute cellulose nanocomposites with moderate catalytic activity.

Nanocrystalline jute cellulose (NCJC) particles were prepared from bleached jute pulp by a modified acid hydrolysis. The surface of NCJC particles were first modified with iron oxide nanoparticles and then with Ag nanoparticles to prepare antibacterial NCJC/Fe3O4/Ag nanocomposite particles. The successive structural modification of NCJC particles with Fe3O4 and Ag nanoparticles was confirmed. NCJC/Fe3O4/Ag nanocomposite particles responded well in external magnetic field. The SEM and TEM images of NCJC particles were in the nanometer range. NCJC/Fe3O4/Ag nanocomposite particles (0.005 mg mL-1) completely degraded 20 mL of 0.1 mM congo red aqueous solution within 13 min aided by NaBH4 reducing agent. NCJC/Fe3O4/Ag nanocomposite particles were moderately active against both Gram positive and Gram negative bacteria. A maximum inhibition zone of 21 mm was observed against Gram negative Shigella boydii bacteria with 60 mg/disc of nanocomposite particles. The antioxidant property of nanocomposite particles was also positive.

Ag impregnated sub-micrometer crystalline jute cellulose particles: Catalytic and antibacterial properties.

This work discussed the preparation of Ag nanoparticles (AgNPs) and AgNPs impregnated sub-micrometer crystalline jute cellulose (SCJC) particles using a green synthetic bioreduction method. The ultimate nanocomposite particles were named as SCJC/Ag. The crystalline structure of AgNPs was maintained in SCJC/Ag nanocomposte particles. The catalytic efficiency of SCJC/Ag nanocomposite particles were evaluated for the degradation of congo red (CR) and methylene blue (MB) using NaBH4 as reducing agent. A complete degradation of 20 mL of each CR (0.1 mM) and MB (0.05 mM) dye solution was achieved within 14 min when 0.005 mg mL-1 of SCJC/Ag nanocomposite particles was employed. SCJC/Ag nanocomposite particles also exhibited moderate antibacterial activities against Staphylococcus aureus, Escherichia coli, Shigella dysenteriae and Shigella boydii and the results were comparable with those of the reference AgNPs. SCJC/Ag nanocomposite particles were the most effective against Escherichia coli (E. coli) with minimum inhibitory concentration of 0.014 mg mL-1.