Development of a standard operating procedure for the DCFH2-DA acellular assessment of reactive oxygen species produced by nanomaterials

Improved strategies are required for testing nanomaterials (NMs) to make hazard and risk assessment more efficient and sustainable. Including reduced reliance on animal models, without decreasing the level of human health protection. Acellular detection of reactive oxygen species (ROS) may be useful as a screening assay to prioritize NMs of high concern. To improve reliability and reproducibility, and minimize uncertainty, a standard operating procedure (SOP) has been developed for the detection of ROS using the 2 ‘,7 ‘-dichlorodihydrofluorescein diacetate (DCFH2-DA) assay. The SOP has undergone an inter- and intra-laboratory comparison, to evaluate robustness, reliability, and reproducibility, using representative materials (ZnO, CuO, Mn2O3, and BaSO4 NMs), and a number of calibration tools to normalize data. The SOP includes an NM positive control (nanoparticle carbon black (NPCB)), a chemical positive control (SIN-1), and a standard curve of fluorescein fluorescence. The interlaboratory comparison demonstrated that arbitrary fluorescence units show high levels of partner variability; however, data normalization improved variability. With statistical analysis, it was shown that the SIN-1 positive control provided an extremely high level of reliability and reproducibility as a positive control and as a normalization tool. The NPCB positive control can be used with a relatively high level of reproducibility, and in terms of the representative materials, the reproducibility CuO induced-effects was better than for Mn2O3. Using this DCFH2-DA acellular assay SOP resulted in a robust intra-laboratory reproduction of ROS measurements from all NMs tested, while effective reproduction across different laboratories was also demonstrated; the effectiveness of attaining reproducibility within the interlaboratory assessment was particle-type-specific.

Keywords
Author KeywordsNanomaterialsnanoparticlesnanoformsreactive oxygen speciesoxidative stressfree radicals
Keywords PlusOXIDATIVE STRESSIN-VITROSINGLET OXYGENNANOPARTICLESASSAYTESTS
Author Information
Corresponding Address
Boyles, Matthew
(corresponding author)
Inst Occupat Med IOM, Res Ave North, Edinburgh EH14 4AP, Midlothian, Scotland
Addresses
1 Inst Occupat Med IOM, Res Ave North, Edinburgh EH14 4AP, Midlothian, Scotland
2 Heriot Watt Univ, NanoSafety Grp, Edinburgh, Midlothian, Scotland
3 BASF SE, Dept Mat Phys, Ludwigshafen, Germany
4 BASF SE, Dept Expt Toxicol & Ecol, Ludwigshafen, Germany
5 Natl Res Ctr Working Environm NFA, Copenhagen, Denmark
E-mail [email protected]
Categories/ Classification
Research AreasToxicology
Citation Topics
2 Chemistry
2.67 Nanoparticles
2.67.231 Silver Nanoparticles
Web of Science CategoriesToxicology
MeSH Terms From MEDLINE®
Chemical From MEDLINE®
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European Commission
European Commission Joint Research Centre 760840
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ISSN
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1537-6516
eISSN
:
1537-6524
Current PublisherTAYLOR & FRANCIS LTD2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND
Research AreasToxicology
Web of Science CategoriesToxicology
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