Department of Analytical Environmental Chemistry, Helmholtz Centre for Environmental Research-UFZ, Leipzig, Germany.
Institute of Chemistry, University of Halle-Wittenberg, Halle, Germany.
Environ Toxicol Chem. 2021 Mar;40(3):910-920. doi: 10.1002/etc.4954. Epub 2021 Feb 9.
Perfluoroalkyl acids (PFAAs) mostly exist as ionic compounds that are of major concern because of their accumulative behavior. The discussion about their risk is ongoing considering the increasing production of structurally similar alternatives. We conducted model calculations based on equilibrium distribution coefficients that allow studying the distribution of PFAAs and their alternatives in various mammalian organs through comparison to empirical measurements in humans and rats. The calculations rely on experimentally determined distribution coefficients of a series of PFAAs and 4 of their alternatives to physiological matrices such as structural proteins, storage lipids, membrane lipids, albumin, and fatty acid binding protein (FABP). The relative sorption capacities in each organ were calculated from the combination of distribution coefficients and physiological data. The calculated distribution of PFAAs and alternatives within the organs showed that albumin and membrane lipids and, to a lesser extent, structural proteins have the highest relative sorption capacities for the compounds. Sorption to FABP is only relevant in the distribution of short-chain PFAAs. Storage lipids play a minor role in the distribution of all studied compounds. Our calculated distribution of PFAAs was evaluated by comparison to reported PFAA concentrations in various organs. Environ Toxicol Chem 2021;40:910-920. © 2020 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.
全氟烷基酸（PFAAs）主要以离子化合物的形式存在，由于其积累行为而受到广泛关注。考虑到结构相似替代品的产量不断增加，关于它们风险的讨论仍在继续。我们基于平衡分配系数进行了模型计算，通过与人类和大鼠的经验测量值进行比较，这些计算可以研究 PFAAs 及其替代品在各种哺乳动物器官中的分布。该计算依赖于一系列 PFAAs 及其 4 种替代品与生理基质（如结构蛋白、储存脂质、膜脂质、白蛋白和脂肪酸结合蛋白（FABP））的实验确定的分配系数。根据分配系数和生理数据，从每个器官的相对吸附能力进行了计算。在器官内计算出的 PFAAs 和替代品的分布表明，白蛋白和膜脂质，以及在较小程度上的结构蛋白对这些化合物具有最高的相对吸附能力。FABP 的吸附仅与短链 PFAAs 的分布有关。储存脂质在所有研究化合物的分布中作用较小。我们通过与各种器官中报道的 PFAA 浓度进行比较，评估了计算出的 PFAAs 分布。Environ Toxicol Chem 2021;40:910-920。© 2020 作者。环境毒理化学由 Wiley Periodicals LLC 代表 SETAC 出版。
