Decontamination of powdery foods using an intense pulsed light (IPL) device for practical application

Hee Jeong Hwang, So Yoon Yee, Myong Soo Chung

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Controlling microbial problems when processing seeds and powdered foods is difficult due to their low water activity, irregular surfaces, and opaqueness. Moreover, existing thermal processing can readily cause various undesirable changes in sensory properties. Intense pulsed light (IPL) can be effective in nonthermal processing, and so two xenon lamps were attached to the sides of a self-designed cyclone type of pilot-scale IPL device. Each lamp was connected to its own power supply, and the following treatment conditions were applied to four sample types: lamp DC voltage of 1800-4200 V, pulse width of 0.5-1.0 ms, frequency of 2 Hz, and treatment time of 1-5 min. This device achieved reductions of 0.45, 0.66, and 0.88 log CFU/mL for ground black pepper, red pepper, and embryo buds of rice, respectively, under a total energy fluence of 12.31 J/cm2. Meanwhile, >3-log reductions were achieved for sesame seed samples under a total energy fluence of 11.26 J/cm2. In addition, analyses of color changes, water activity, and moisture content revealed no significant differences between the control and IPL-treated samples. These findings indicate that IPL treatment may be considered a feasible sterilization method for seeds and powdered foods.

Original languageEnglish
Article number1518
Pages (from-to)1-11
Number of pages11
JournalApplied Sciences (Switzerland)
Issue number4
StatePublished - 2 Feb 2021

Bibliographical note

Funding Information:
Acknowledgments: This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2019R1A2C1085100).

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.


  • Cyclone
  • Intense pulsed light (IPL)
  • Pilot scale
  • Powdered foods
  • Seeds


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