Overview
ISO/TS 22082:2020 - Nanotechnologies: Assessment of nanomaterial toxicity using dechorionated zebrafish embryo specifies a rapid, standardized method for evaluating nanomaterial toxicity in early life‑stage zebrafish (0 HPF to 120 HPF). The technical specification describes why removal of the acellular chorion is important for nanomaterial exposure, gives detailed chorion‑removal procedures (enzymatic and mechanical), and presents a complete test protocol from culture and spawning to exposure, endpoint observation and data analysis.
Key topics and requirements
- Scope and purpose: Rapid toxicity screening of engineered nanomaterials using dechorionated zebrafish embryos (0–120 HPF).
- Chorion removal: Procedures for enzymatic dechorionation (e.g., pronase-based methods) and mechanical dechorionation (see Annex A). Advantages and limitations are discussed (enzymatic: high throughput and less mechanical damage; variability in enzyme activity can affect success).
- Culture and spawning: Guidance on zebrafish strain, feeding, photoperiod, temperature, pH and spawning procedures (Annex B).
- Test setup: Preparation of nanomaterial stock solutions, dispersion techniques, selection of testing concentrations and range‑finding tests.
- Controls and validation: Use of a positive control (3,4‑dichloroaniline) and criteria for results validation (Annex C).
- Exposure and endpoints: Water quality measurement, preparation and exposure of dechorionated embryos, observation of acute and sub‑acute endpoints up to 120 HPF.
- Data analysis and reporting: Requirements for LC50/NOAEL determination, data handling and detailed test reporting (sections 7–8).
Applications and users
ISO/TS 22082:2020 is intended for:
- Nanotoxicologists and ecotoxicologists conducting hazard screening of engineered nanomaterials.
- Environmental safety and regulatory laboratories performing alternative in vivo assays.
- Nanomaterial manufacturers and product stewardship teams assessing early‑stage toxicity.
- Contract research organizations (CROs) seeking standardized, high‑throughput embryo assays.
Practical benefits include faster screening, reduced use of mature vertebrates (animal welfare advantage), and improved ability to detect nanomaterial bioactivity that might be masked by the chorion.
Related standards
This Technical Specification references and aligns with existing nanotechnology and toxicity guidance, including:
ISO/TS 22082:2020 provides a practical, standardized approach for assessing nanomaterial toxicity using dechorionated zebrafish embryos, supporting reproducible screening and regulatory‑relevant reporting.