Interest in biodegradable polymers is growing because they are antimicrobial carriers in active containers. With this objective in mind, studies have focused on active films based on chitosan and methylcellulose, which had previously been enriched with natamycin.
After immersing the films in ethanol at different temperatures, the reversed high-resolution liquid chromatography determined the natamycin content in food.
The results showed that natamycin is released more slowly from films based on chitosan than from a methylcellulose film at the same temperature.
Meanwhile, samples of cheese were taken and completely covered with active films in order to assess the films’ antimicrobial efficacy. They were subsequently stored at a temperature of 20 ° C during 7 days.
According to microbiological analyses, yeasts and moulds were reduced significantly in the samples that had been treated with active films of chitosan.
The good compatibility showed between natamycin, chitosan and the antimicrobial properties, therefore, suggests that these types of films can be used with positive effect in active or antimicrobial packaging.