Characterization and long term antimicrobial activity of the nisin anchored cellulose films.

To obtain a safe and biodegradable material for food packaging, this study developed a facile and green process of anchoring nisin onto oxidized cellulose through a simple Schiff base reaction for long-term antimicrobial active food packaging. To the best of our knowledge, this is the first report of such a packaging. The grafting reaction between the amino groups of nisin and the aldehyde groups of oxidized cellulose films was successfully established to obtained a nisin anchored cellulose films (NC) membrane; the structure was characterized with Fourier transform infrared spectroscopy, scanning electron microscopy, and thermogravimetric analysis. The NCs membrane had an outstanding transparent property of above 90% transmittance through 300nm to 800nm; while, the barrier properties against oxygen remain excellent. The thermal stability of the NCs membrane remained excellent and enabled an easier degradation than the original cellulose membrane. The NCs membrane displayed good antimicrobial activity against Alicyclobacillus acidoterrestris DSM 3922T in a long-term way, thus demonstrating good potential as food packaging material. The obtained results are promising and confirm the development of NCs membranes as green materials for food packaging.