Antimicrobial activity of safflower seed meal extract and its application as an antimicrobial agent for the inactivation of Listeria monocytogenes inoculated on fresh lettuce

This study examined the antimicrobial activity of safflower seed meal extract (SSME) against foodborne pathogens, and the microbial reduction effects of combined treatment with SSME and fumaric acid (FA) against Listeria monocytogenes inoculated on lettuce. Results with SSME showed antimicrobial activity against the pathogens, with the highest activity against L. monocytogenes. With 0.7% SSME treatment for 3 min, the reduction levels of total aerobic bacteria and L monocytogenes in lettuce were 1.55 and 1.58 log CFU/g, respectively, compared with the control. In particular, the combined treatment with SSME and FA reduced the populations further by 1.14 and 1.66 log CFU/g compared to those in SSME treatment alone. The combined treatment did not affect quality indicators such as lettuce color. These results indicate that combined treatment of SSME and FA can be used as a novel antimicrobial agent for inactivating the pathogens in fresh produce. (C) 2017 Elsevier Ltd. All rights reserved.