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<p>This study presents the development and characterization of a pilot-scale remote cold plasma treatment (RCPT) system designed for the surface decontamination of fruits. The developed system utilizes long-lived reactive oxygen and nitrogen species (RONS), generated in the plasma afterglow region of a coaxial dielectric barrier discharge (DBD) plasma reactor, offering a safe and effective method for microbial disinfection and pesticide residue removal from fruit surfaces. Plasma diagnostics, visualization of RONS distribution, and measurements of RONS gas concentrations were conducted to analyze the types and spatial distribution of RONS within the treatment chamber. The efficacy of the RCPT system was evaluated through in vitro bacterial inactivation assays using <i>Escherichia coli</i> (<i>E. coli</i>) and methicillin-resistant <i>Staphylococcus aureus</i> (MRSA), as well as antimicrobial activity analysis on Cripps Pink apples and Shine Muscat grapes. The results indicated that the RCPT system achieved a microbial reduction exceeding 98%. Furthermore, pesticide residue analysis confirmed the effectiveness of the developed system in degrading harmful chemical residues. These findings highlight the RCPT system as a promising non-thermal, water-free, and chemical-free approach for postharvest fruit decontamination, contributing to enhanced food safety and extended shelf life. Future studies will focus on optimizing treatment parameters and addressing challenges related to large-scale implementation and the preservation of fruit quality.</p>

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Development and Characterization of Pilot-Scale Remote Cold Plasma Treatment (RCPT) System for Fruit Surface Decontamination

  • 期刊论文

  • 发表日期：

    2025年6月9日

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  • Mathin Jaikua,
  • Jakkrawut Maitip,
  • Sunisa Ungwiwatkul,
  • Woranika Promsart,
  • Kanyarak Prasertboonyai,
  • Arlee Tamman,
  • Pichitpon Neamyou,
  • Phuthidhorn Thana

摘要

This study presents the development and characterization of a pilot-scale remote cold plasma treatment (RCPT) system designed for the surface decontamination of fruits. The developed system utilizes long-lived reactive oxygen and nitrogen species (RONS), generated in the plasma afterglow region of a coaxial dielectric barrier discharge (DBD) plasma reactor, offering a safe and effective method for microbial disinfection and pesticide residue removal from fruit surfaces. Plasma diagnostics, visualization of RONS distribution, and measurements of RONS gas concentrations were conducted to analyze the types and spatial distribution of RONS within the treatment chamber. The efficacy of the RCPT system was evaluated through in vitro bacterial inactivation assays using Escherichia coli (E. coli) and methicillin-resistant Staphylococcus aureus (MRSA), as well as antimicrobial activity analysis on Cripps Pink apples and Shine Muscat grapes. The results indicated that the RCPT system achieved a microbial reduction exceeding 98%. Furthermore, pesticide residue analysis confirmed the effectiveness of the developed system in degrading harmful chemical residues. These findings highlight the RCPT system as a promising non-thermal, water-free, and chemical-free approach for postharvest fruit decontamination, contributing to enhanced food safety and extended shelf life. Future studies will focus on optimizing treatment parameters and addressing challenges related to large-scale implementation and the preservation of fruit quality.