Risk-based high-throughput chemical screening and prioritization using exposure models and in vitro bioactivity assays

Hyeong-Moo Shin, Alexi Ernstoff, Jon Arnot, Barbara Wetmore, S. A. Csiszar, Peter Fantke, Xianming Zhang, Thomas E. McKone, Olivier Jolliet, Deborah Bennett

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    Abstract

    We present a risk-based high-throughput screening (HTS) method to identify chemicals for potential health concerns or for which additional information is needed. The method is applied to 180 organic chemicals as a case study. We first obtain information on how the chemical is used and identify relevant use scenarios (e.g., dermal application, indoor emissions). For each chemical and use scenario, exposure models are then used to calculate a chemical intake fraction, or a product intake fraction, accounting for chemical properties and the exposed population. We then combine these intake fractions with use scenario-specific estimates of chemical quantity to calculate daily intake rates (iR; mg/kg/day). These intake rates are compared to oral equivalent doses (OED; mg/kg/day), calculated from a suite of ToxCast in vitro bioactivity assays using in vitro-to-in vivo extrapolation and reverse dosimetry. Bioactivity quotients (BQs) are calculated as iR/OED to obtain estimates of potential impact associated with each relevant use scenario. Of the 180 chemicals considered, 38 had maximum iRs exceeding minimum OEDs (i.e., BQs > 1). For most of these compounds, exposures are associated with direct intake, food/oral contact, or dermal exposure. The method provides high-throughput estimates of exposure and important input for decision makers to identify chemicals of concern for further evaluation with additional information or more refined models.
    Original languageEnglish
    JournalEnvironmental Science & Technology (Washington)
    Volume49
    Pages (from-to)6760−6771
    ISSN0013-936X
    DOIs
    Publication statusPublished - 2015

    Bibliographical note

    This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.

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