Fig. 4. Microbial reduction (log CFU g−1) of aerobic mesophilic counts (A), aerobic psychrotrophic counts (B), and molds and yeasts (C) present on ready-to-eat lettuce. The column indicates mean ± standard deviation, and the different letters above the columns indicate significant differences (P < 0.05). PHMG: polyhexamethylene guanidine hydrochloride; PMS: potassium peroxymonosulfate.
