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Background  The surface of a nanoparticle adsorbs molecules from its surroundings with a specific affinity determined by the chemical and physical properties of the nanomaterial. When a nanoparticle is exposed to a biological system, the adsorbed molecules form a dynamic and specific surface layer called a bio-corona. The present study aimed to identify the metabolites that form the bio-corona around anatase TiO 2  nanoparticles incubated with leaves of the model plant  Arabidopsis thaliana .    Results  We used an untargeted metabolomics approach and compared the metabolites isolated from wild-type plants with plants deficient in a class of polyphenolic compounds called flavonoids.    Conclusions  These analyses showed that TiO 2  nanoparticle coronas are enriched for flavonoids and lipids and that these metabolite classes compete with each other for binding the nanoparticle surface.

Metabolomic analyses of the bio-corona formed on TiO2 nanoparticles incubated with plant leaf tissues