Antimicrobial Activity of Chlorine Dioxide Gas against Cladosporium tenuissimum on Strawberries
2023
Kim, E.G. | Kim, H.K.
Cladosporium tenuissimum is one of the major spoilage microorganisms causing a decreased shelf life of strawberries. The aim of this study was to apply chlorine dioxide (ClO₂) gas to inactivate C. tenuissimum on strawberries. Strawberries inoculated with the organism were treated with ClO₂ gas for up to 10 h. ClO₂ gas was generated from either 1 mL or 2 mL of ClO₂ solution in a sealed container at 12℃ or 25℃. The concentration of ClO₂ gas peaked at 370∼392 and 732∼844 ppm within 30 min upon deposition of 1 mL and 2 mL of ClO₂ solution, respectively, and gradually decreased thereafter. Within 30 min of ClO₂ gas treatment, the populations of C. tenuissium on strawberries significantly reduced by 1.89∼2.51 log CFU/sample, regardless of temperature. However, the microbial populations on untreated strawberries (control) showed no significant change at 12℃ or 25℃. At the same treatment, more rapid reduction rate in microbial population occurred at 25℃ than at 12℃. Mold growth on strawberries was monitored during storage after exposure to the gas. Compared to untreated strawberries, mold growth on the ClO₂ gas-treated strawberries was delayed. Our findings provide useful information for the development of antimicrobial applications using ClO₂ gas to control microbial spoilage and extend the shelf-life of berries.
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