SDRP Journal of Food Science & Technology

Efficacy of a Citric Acid-based Organic Sanitizer against Salmonella enterica and Background Microflora on Fresh-cut Celery and Leeks

Citation

Libin Zhu, Efficacy of a Citric Acid-based Organic Sanitizer against Salmonella enterica and Background Microflora on Fresh-cut Celery and Leeks(2016)SDRP Journal of Food Science & Technology 1(2)

Abstract

The efficacy of a citric acid-based organic sanitizer (organic Chico Wash) against Salmonella enterica serovar Newport and background microflora on fresh-cut celery and leeks was investigated. Three concentrations (1:10, 1:20 and 1:40) of Chico Wash were used. De-ionized water and 200 ppm chlorine were used as controls. For evaluating the efficacy against background microflora, fresh-cut celery or leeks were treated with sanitizers without an initial wash. For evaluating the efficacy against Salmonella, fresh-cut produce samples were initially washed and dip inoculated with 107 CFU/ml S. Newport. Samples were immersed in the sanitizer solutions for 2 min. Samples were taken for enumeration of survivors immediately after treatment and after storage at 4oC for 1, 3 and 6 days. Compared to controls washed in water at day 6, Chico Wash reduced Salmonella and background microflora by 0.7-1.5 and 1.2-2.6 log CFU/g, respectively. All three concentrations of Chico Wash showed 0.2-1.1 log additional reductions in Salmonella population compared to chlorine. At day 6, background microflora population on celery and leeks were 1-1.7 and 1.5-2.2 logs lower, respectively, than that on chlorine treated samples. The antimicrobial activity was concentration and storage time dependant.

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