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Assessment of respiratory and systemic toxicity of Benzalkonium chloride following a 14-day inhalation study in rats

Authors
  • Choi, Hye-Yeon1, 2
  • Lee, Yong-Hoon1
  • Lim, Cheol-Hong1
  • Kim, Yong-Soon1
  • Lee, In-Seop1
  • Jo, Ji-Min1
  • Lee, Ha-Young1
  • Cha, Hyo-Geun1
  • Woo, Hee Jong2
  • Seo, Dong-Seok1
  • 1 Occupational Safety and Health Research Institute, KOSHA, 30 Expo-ro 339beon-gil, Yuseong-gu, Daejeon, 34122, Republic of Korea , Daejeon (South Korea)
  • 2 Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea , Seoul (South Korea)
Type
Published Article
Journal
Particle and Fibre Toxicology
Publisher
BioMed Central
Publication Date
Jan 28, 2020
Volume
17
Issue
1
Identifiers
DOI: 10.1186/s12989-020-0339-8
Source
Springer Nature
Keywords
License
Green

Abstract

BackgroundAlthough biocides at low concentrations have been used to control pests, they can be more harmful than industrial chemicals as humans are directly and frequently exposed to such biocides. Benzalkonium chloride (BAC or BKC) is a non-toxic substance used to control pests. Recently, BAC has been increasingly used as a component in humidifier disinfectants in Korea, raising a serious health concern. Moreover, it poses significant health hazards to workers handling the chemical because of direct exposure. In the present study, we aimed to evaluate the respiratory toxicity of BAC due to its inhalation at exposure concentrations of 0.8 (T1 group), 4 (T2 group) and 20 (T3 group) mg/m3.ResultsIn our previous study on the acute inhalational toxicity of BAC, bleeding from the nasal cavity was observed in all the rats after exposure to 50 mg/m3 BAC. Therefore, in this study, 20 mg/m3 was set as the highest exposure concentration, followed by 4 and 0.8 mg/m3 as the medium and low concentrations for 6 h/day and 14 days, respectively. After exposure, recovery periods of 2 and 4 weeks were provided. Additionally, alveolar lavage fluid was analyzed in males of the BAC-exposed groups at the end of exposure and 2 weeks after exposure to evaluate oxidative damage.In the T3 group exposed to BAC, deep breathing, hoarseness, and nasal discharge were observed along with a decline in feed intake and body weight, and nasal discharge was also observed in the T1 and T2 groups. ROS/RNS, IL-1β, IL-6, and MIP-2 levels decreased in a concentration-dependent manner in the bronchoalveolar lavage fluid. Histopathological examination showed cellular changes in the nasal cavity and the lungs of the TI, T2, and T3 groups.ConclusionsAs a result, it was confirmed that the target organs in the respiratory system were the nasal cavity and the lungs. The adverse effects were evaluated as reversible responses to oxidative damage. Furthermore, the no observed adverse effect level was found to be less than 0.8 mg/m3 and the lowest benchmark dose was 0.0031 mg/m3. Accordingly, the derived no-effect level of BAC was calculated as 0.000062 mg/m3.

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