Microbial Decontamination of Rice Germ Using a Large-Scale Plasma Jet-Pulsed Light-Ultraviolet-C Integrated Treatment System

Seung Young Lee, Won Kyu Lee, Joung Woo Lee, Myong Soo Chung, Se Wook Oh, Jung Kue Shin, Sea C. Min

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Integration of plasma and pulsed light or ultraviolet has been investigated for microbial decontamination of foods. However, no studies have reported the microbial disinfection of particulate food using a large-scale system integrating the treatments. In the present study, a large-scale plasma jet-pulsed light-ultraviolet (UV)-C (PPU) system has been developed for the microbial decontamination of particulate foods. The effects of PPU treatment on the inactivation of natural mesophilic aerobic bacteria and yeast and molds of rice germ and the quality properties of rice germ were evaluated at various operation times (3, 5, 7, and 10 min) and sample amount (200, 500, 1,000, and 3,000 g). The efficacy of microbial inactivation of PPU treatment was enhanced with increasing treatment time and decreasing sample amount, and the maximum reduction was observed at 7 min with 200 g samples. The number of the natural bacteria and yeast and mold was reduced to 1.0 and 2.0 log CFU/g from an initial number of 5.7 and 3.7 log CFU/g, respectively. Compared to the individual treatments by atmospheric pressure plasma jet (APPJ) and intense pulsed light (IPL), PPU treatment synergistically inactivated microorganisms while not altering the color, antioxidant activity, or sensory properties of rice germ. The results of this study suggest the potential use of the large-scale PPU treatment system for the microbial decontamination of rice germ while minimizing alterations in quality.

Original languageEnglish
Pages (from-to)542-553
Number of pages12
JournalFood and Bioprocess Technology
Issue number3
StatePublished - Mar 2021

Bibliographical note

Funding Information:
This work was supported by Korea Institute of Planning and Evaluation for Technology in Food, Agriculture and Forestry (IPET) through High Value-added Food Technology Development Program, funded by Ministry of Agriculture, Food and Rural Affairs (MAFRA) (317030-03), by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2019R1A2B5B01069364), and by a research grant from Seoul Women’s University (2021).

Publisher Copyright:
© 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC part of Springer Nature.


  • Cold plasma
  • Combined treatment
  • Large scale system
  • Microbial disinfection
  • Particulate


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