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This study aims at the optimization of a novel analytical approach for the characterization of TiO2 nanoparticles (NPs) in food additives by asymmetric-flow field-flow fractionation (AF4) in tandem with inductively coupled plasma-mass spectrometry (ICP-MS). For this purpose, the influence of pH, ionic strength, and of various surfactants on the zeta potential (ZP) of both NPs and the AF4 membrane...