Effect of electrolyzed water and hot-air-drying with UV for the reduction of microbial populations of undaria pinnatifida

Si Woo Bark, Koth Bong Woo Ri Kim, Min Ji Kim, Bo Kyeong Kang, Won Min Pak, Bo Ram Kim, Na Kyung Ahn, Yeon Uk Choi, Young Je Cho, Dong Hyun Ahn

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1 Scopus citations

Abstract

This study was conducted to investigate the effects of electrolyzed water (EW) and hot-air-drying with ultraviolet light (UV) to reduce coliform bacteria of Undaria pinnatifida (UP). The UP was washed in the order of 15% EW, tap water (TW), and distilled water (DW) under following conditions: 15% EW for 10 min (washing: 1 time), TW for 1 min, and DW for 10 min (washing: 5 times). Viable cells, coliform, and mold counts were at 102-103 CFU/g in untreated samples. After EW treatment, viable cells, coliform, and molds were not detected in whole samples or on the surface of UP. But, after hot-air-drying at 48°C for 48 h, the number of viable cells, coliform, and molds were 101-105 CFU/g. After hot-air-drying at 48°C for 48 h with UV (12-48 h), viable cells, coliform, and molds were not detected in whole samples or on the surface of UP. In respect of color value, there were no significant changes. In sensory evaluation, the UP with hot-air-drying with UV (12 h) had the highest score in overall preference among UV treatment groups. These results suggest that the treatments at 15% EW for 10 min and hot-air-drying at 48°C for 48 h with UV (12 h) were effective to reduce coliform bacteria of the dried Undaria pinnatifida.

Original languageEnglish
Pages (from-to)38-44
Number of pages7
JournalMicrobiology and Biotechnology Letters
Volume43
Issue number1
DOIs
StatePublished - 1 Mar 2015

Keywords

  • Coliform bacteria
  • Electrolyzed water
  • Quality
  • Ultraviolet
  • Undana pinnatifida

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