Effects of nisin-incorporated films on the microbiological and physicochemical quality of minimally processed mangoes

The aim of this study is to examine the effects of nisin-incorporated cellulose films on the physicochemical and microbiological qualities of minimally processed mangoes. The use of antimicrobial films did not affect the physicochemical characteristics of mangoes and showed antimicrobial activity against Staphylococcus aureus, Listeria monocytogenes, Alicyclobacillus acidoterrestris and Bacillus cereus. The mango slices were inoculated with S. aureus and L. monocytogenes (10(7) CFU/g), and the viable cell numbers remained at 10(5) and 10(6) CFU/g, respectively, after 12 days. In samples packed with antimicrobial films, the viable number of L. monocytogenes cells was reduced below the detection level after 4 days. After 6 days, a reduction of six log units was observed for S. aureus. In conclusion, nisin showed antimicrobial activity in mangoes without interfering with the organoleptic characteristics of the fruit. This result suggests that nisin could potentially be used in active packing to improve the safety of minimally processed mangoes. (c) 2013 Elsevier B.V. All rights reserved.