Effect of electrolyzed water as a disinfectant for fresh-cut fruit

• Author(s): Graça, Ana ; Salazar, Miguel ; Quintas, Célia ; Manso, Teresa ; Nunes, Carla
• Date: 2010
• Persistent ID: http://hdl.handle.net/10400.1/2906
• Origin: Sapientia - Universidade do Algarve
• Subject(s): Acidic electrolyzed water; Apples; Escherichia coli; Listeria innocua; Neutral electrolyzed water; Orange
• Document Type: Part of book or chapter of book
• Language: English
• Editor(s): Nunes, Carla

Description

Proceedings of the International Conference “Environmentally friendly and safe technologies for quality of fruit and vegetables”, held in Universidade do Algarve, Faro, Portugal, on January 14-16, 2009. This Conference was a join activity with COST Action 924. In fresh-cut processing the disinfection is the most important step. This process can affect the quality and the safety of the end product as well as its shelf life. Chlorine is the most used disinfectant in fresh-cut industry but due to its association with environmental and health risks, the development of alternative sanitizers is emergent. Electrolyzed water (EW) may be an alternative to the use of chlorine sanitizers and both acidic electrolyzed water (AEW) and neutral electrolyzed water (NEW) can be used with this purpose. In fact, several studies have shown that EW can be effective in reducing pathogenic bacteria on the surface of fruits and vegetables. This manuscript presents a review of electrolyzed water approaches, its antimicrobial activity in fresh-cut produce and the results of a study undertaken in our laboratory to evaluate the disinfection efficacy of AEW and NEW on fresh-cut apples and oranges. Fresh-cut apples and fresh cut oranges were inoculated with a suspension of Listeria innocua and fresh-cut oranges with Escherichia coli at a concentration of 107 cfu mL-1 and treated with the different solutions. Untreated freshcut fruits were used as control. The best sanitizing treatment for both pathogens and fruits was AEW at 200 ppm of free chlorine applied during 5 minutes.