title: Periodic table-based descriptors to encode cytotoxicity profile of metal oxide nanoparticles: a mechanistic QSTR approach.
abstract: Nanotechnology has evolved as a frontrunner in the development of modern science. Current studies have established toxicity of some nanoparticles to human and environment. Lack of sufficient data and low adequacy of experimental protocols hinder comprehensive risk assessment of nanoparticles (NPs). In the present work, metal electronegativity (χ), the charge of the metal cation corresponding to a given oxide (χox), atomic number and valence electron number of the metal have been used as simple molecular descriptors to build up quantitative structure-toxicity relationship (QSTR) models for prediction of cytotoxicity of metal oxide NPs to bacteria Escherichia coli. These descriptors can be easily obtained from molecular formula and information acquired from periodic table in no time. It has been shown that a simple molecular descriptor χox can efficiently encode cytotoxicity of metal oxides leading to models with high statistical quality as well as interpretability. Based on this model and previously published experimental results, we have hypothesized the most probable mechanism of the cytotoxicity of metal oxide nanoparticles to E. coli. Moreover, the required information for descriptor calculation is independent of size range of NPs, nullifying a significant problem that various physical properties of NPs change for different size ranges.
authors.affiliation: Drug Theoretics and Cheminformatics Laboratory, Department of Pharmaceutical Technology, Jadavpur University, Kolkata 700032, India; Laboratory of Environmental Chemometrics, Institute for Environmental and Human Health Protection, Faculty of Chemistry, University of Gdańsk, Gdańsk, Poland.
authors.forename: Supratik
authors.initials: S
authors.lastname: Kar
authors.affiliation: Laboratory of Environmental Chemometrics, Institute for Environmental and Human Health Protection, Faculty of Chemistry, University of Gdańsk, Gdańsk, Poland.
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Gajewicz
authors.affiliation: Laboratory of Environmental Chemometrics, Institute for Environmental and Human Health Protection, Faculty of Chemistry, University of Gdańsk, Gdańsk, Poland.
authors.forename: Tomasz
authors.initials: T
authors.lastname: Puzyn
authors.affiliation: Drug Theoretics and Cheminformatics Laboratory, Department of Pharmaceutical Technology, Jadavpur University, Kolkata 700032, India. Electronic address: kunalroy_in@yahoo.com.
authors.forename: Kunal
authors.initials: K
authors.lastname: Roy
authors.affiliation: Department of Chemistry and Biochemistry, Jackson State University Jackson, MS 39217-0510, USA.
authors.forename: Jerzy
authors.initials: J
authors.lastname: Leszczynski
mesh_terms: D004926:Escherichia coli; D053768:Metal Nanoparticles / Q000633:toxicity*; D008670:Metals / Q000633:toxicity; D008956:Models, Chemical; D036103:Nanotechnology; D010087:Oxides / Q000633:toxicity; D021281:Quantitative Structure-Activity Relationship
chemical_list: D008670:Metals; D010087:Oxides
keywords: Escherichia coli; Metal oxide nanoparticle; Nanotoxicity; QSTR