Wrangling whole mixtures risk assessment: Recent advances in determining sufficient similarity
Current Opinion in Toxicology(2023)
Abstract
Human health risk assessments for complex mixtures can address real-world exposures and protect public health. While risk assessors typically prefer whole mixture approaches over component-based approaches, data from the precise expo-sure of interest are often unavailable and surrogate data from a sufficiently similar mixture(s) are required. This review de-scribes recent advances in determining sufficient similarity of whole, complex mixtures spanning the comparison of chemical features, bioactivity profiles, and statistical evaluation to determine "thresholds of similarity." Case studies, including water disinfection byproducts, botanical ingredients, and wild-fire emissions, are used to highlight tools and methods. Limi-tations to application of sufficient similarity in risk-based decision making are reviewed and recommendations presen-ted for developing best practice guidelines.
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Key words
Complex mixtures,New approach methodologies,Non-targeted chemical analysis,Water disinfection byproducts,Botanicals,Wildfire smoke
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