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Inhibition Effect of Bacillus subtilis on 365 nm UV-LED Irradiation According to Packaging Materials

포장재 조건에 따른 365 nm UV-LED 조사의 Bacillus subtilis 생육 억제 효과

  • Lee, Da-Hye (Department of Food Science and Technology/Institute of Food Science, Pukyong National University) ;
  • Jeong, So-Mi (Institute of Fisheries Sciences, Pukyong National University) ;
  • Xu, Xiaotong (Department of Food Science and Technology/Institute of Food Science, Pukyong National University) ;
  • Kim, Koth-Bong-Woo-Ri (Institute of Fisheries Sciences, Pukyong National University) ;
  • Ahn, Dong-Hyun (Department of Food Science and Technology/Institute of Food Science, Pukyong National University)
  • 이다혜 (부경대학교 식품공학과/식품연구소) ;
  • 정소미 (부경대학교 수산과학연구소) ;
  • 쉬시아오통 (부경대학교 식품공학과/식품연구소) ;
  • 김꽃봉우리 (부경대학교 수산과학연구소) ;
  • 안동현 (부경대학교 식품공학과/식품연구소)
  • Received : 2018.12.12
  • Accepted : 2019.02.27
  • Published : 2019.09.28

Abstract

The use of ultraviolet (UV) spectroscopy for foods is known to have a microbial inhibitory effect. UV-A having a longer wavelength than UV-C can be used for continuous or intermittent UV irradiation of food stored in containers or packages. Because UV-LED can be used effectively at a low price, this study reported the effect of UV-A 365 nm-LED on inhibiting Bacillus subtilis in accordance with the packaging conditions employed in daily use. The packaging materials were linear low-density polyethylene (LLD-PE), nylon/low density polyethylene (LDPE), polystyrene, and glass. When all packaging materials were treated with 365 nm UV-LED, B. subtilis was observed to remain inactive for 30-60 min. Further, compared with the control (-log 5), the survival rate of B. subtilis was -log 2.0-2.5 for nylon/LDPE and -log 2.58-3.61 for LLD-PE. These packaging materials showed an excellent inhibitory effect regardless of their thickness. Typically, a decrease in the viable cell count of more than 3 log indicates a 99.9% bactericidal effect. These results suggest that 365 nm UV-LED permeated the packaging material and inhibited bacterial growth.

Keywords

Ultraviolet light-emitting diode;B. subtilis;bactericidal control effect

Acknowledgement

Supported by : Pukyung National University

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