PUBLICATION
Benzalkonium chloride, benzethonium chloride, and chloroxylenol - Three replacement antimicrobials are more toxic than triclosan and triclocarban in two model organisms
- Authors
- Sreevidya, V.S., Lenz, K.A., Svoboda, K.R., Ma, H.
- ID
- ZDB-PUB-180120-3
- Date
- 2018
- Source
- Environmental pollution (Barking, Essex : 1987) 235: 814-824 (Journal)
- Registered Authors
- Svoboda, Kurt
- Keywords
- C. elegans, Replacement antimicrobials, Toxicity, Triclosan and triclocarban, Zebrafish embryos
- MeSH Terms
-
- Animals
- Anti-Infective Agents/toxicity*
- Benzalkonium Compounds/toxicity*
- Benzethonium/toxicity*
- Caenorhabditis elegans/drug effects
- Carbanilides/toxicity*
- Larva/drug effects
- Toxicity Tests
- Triclosan/toxicity*
- Xylenes/toxicity*
- Zebrafish/embryology
- PubMed
- 29348075 Full text @ Environ. Pollut.
Citation
Sreevidya, V.S., Lenz, K.A., Svoboda, K.R., Ma, H. (2018) Benzalkonium chloride, benzethonium chloride, and chloroxylenol - Three replacement antimicrobials are more toxic than triclosan and triclocarban in two model organisms. Environmental pollution (Barking, Essex : 1987). 235:814-824.
Abstract
With the recent ban of triclosan (TCS) and triclocarban (TCC) from some personal care products, many replacement antimicrobial compounds have been used. Yet the potential health risk and environmental impact of these replacement compounds are largely unknown. Here we investigated the toxicological effects of three commonly used replacement antimicrobials, benzalkonium chloride (BAC), benzethonium chloride (BEC), and chloroxylenol (CX) to two model organisms, the nematode C. elegans and zebrafish (Danio rerio), and compared them to the banned TCS and TCC. We found that these replacement compounds are not any safer than the banned antimicrobials. In the worm, at least one of the three, BAC, showed comparable toxicity to TCS from organismal to molecular levels, with toxic effects occurring at lower hundred μg/L to lower mg/L levels. In the fish, all three compounds at the tested concentration ranges (0.05-5 mg/L) showed toxicity effects to zebrafish embryos, indicated by hatching delay or inhibition, embryonic mortality, morphological malformations, and neurotoxicity. BAC was the most toxic among the three, with acute lethal toxicity occurring at environmentally relevant concentrations (hundreds of μg/L), which is comparable to the banned TCC. However, the toxicity effects of BAC and TCC occurred within different time windows, potentially suggesting different mechanisms of toxicity. CX was the only compound that induced a "body curvature" phenotype among the five compounds examined, suggesting a unique mode of toxic action for this compound. Furthermore, all five compounds except TCS induced neurotoxicity in fish larvae, indicated by alterations in secondary motoneuron axonal projections. Such neurotoxicity has been largely understudied for these antimicrobials in the past years and calls for further investigations in terms of its underlying mechanisms and ecological significance. These findings strongly indicate that scrutiny should be put on these replacement compounds before their introduction into massive use in personal care products.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping