Abstract
This research aimed to develop an electrolysis method to generate high-concentration chlorine dioxide (ClO2) for tilapia fillet disinfection. The designed generator produced up to 3500 ppm of ClO2 at up to 99% purity. Tilapia fillets were soaked in a 400 ppm ClO2 solution for 5, 10, and 25 min. Results show that total plate counts of tilapia, respectively, decreased by 5.72 to 3.23, 2.10, and 1.09 log CFU/g. In addition, a 200 ppm ClO2 solution eliminated coliform bacteria and Escherichia coli in 5 min with shaking treatment. Furthermore, ClO2 and trihalomethanes (THMs) residuals on tilapia fillets were analyzed by GC/MS and were nondetectable (GC-MS detection limit was 0.12 ppb). The results conform to Taiwan's environmental protection regulations and act governing food sanitation.
Highlights
Chlorine dioxide (ClO2) is a strong oxidant widely applied for sterilization, disinfection, and waste-water treatment
The objective of this study is to develop novel electrolysis equipment to produce highly purified, low-cost ClO2 to disinfect with water, while simultaneously monitoring trihalomethane (THM) residuals on tilapia fillets
Tilapia fillets were inoculated with coliforms or E. coli at a concentration of 5∼6 log CFU/g
Summary
Chlorine dioxide (ClO2) is a strong oxidant widely applied for sterilization, disinfection, and waste-water treatment. It is commonly used on drinking water and environmental disinfection. It was recommended as a commercial sanitizer to replace electrolyzed oxidizing water [1, 2], chlorine (Cl2), hypochlorous acid (HOCl), and hypochlorite (OCl−) [3,4,5]. As for its application for vegetable and fruit disinfection, ClO2 gas has been successfully used to disinfect strawberries, lettuce, cabbage, and cucumbers with continuous methods [4, 13,14,15,16,17]. The bactericidal efficacy of ClO2 was evaluated for cleaning tilapia fillets with different cleaning methods
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