Methodology for modeling the disinfection efficiency of fresh-cut leafy vegetables wash water applied on peracetic acid combined with lactic acid
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2015Disciplina/s
Ciencias de la AlimentaciónMateria/s
Fresh producePeracetic acid
Leafy vegetables
E. coli O157
Water disinfection
Resumen
A methodology to i) assess the feasibility of water disinfection in fresh-cut leafy greens wash water and ii) to
compare the disinfectant efficiency of water disinfectants was defined and applied for a combination of peracetic
acid (PAA) and lactic acid (LA) and comparison with free chlorine was made. Standardized process water, a watery
suspension of iceberg lettuce, was used for the experiments. First, the combination of PAA + LA was evaluated
for water recycling. In this case disinfectant was added to standardized process water inoculated with
Escherichia coli (E. coli) O157 (6 log CFU/mL). Regression models were constructed based on the batch inactivation
data and validated in industrial process water obtained from fresh-cut leafy green processing plants. The
UV254(F) was the best indicator for PAA decay and as such for the E. coli O157 inactivation with PAA + LA. The
disinfection efficiency of PAA + LA increased with decreasing pH. Furthermore, PAA + LA efficacy was assess...