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Graphene quantum dots unraveling: Green synthesis, characterization, radiolabeling with 99mTc, in vivo behavior and mutagenicity

2019; Elsevier BV; Volume: 102; Linguagem: Inglês

10.1016/j.msec.2019.04.058

1873-0191

Frederico Duarte de Menezes, Sara Rhaissa Rezende dos Reis, Suyene Rocha Pinto, Filipe Leal Portilho, Francisco do Vale Chaves e Mello, Edward Helal‐Neto, Aline Oliveira da Silva de Barros, Luciana Magalhães Rebêlo Alencar, Alan Silva de Menezes, Clenilton Costa dos Santos, Aldilene Saraiva-Souza, Jamila Alessandra Perini, Daniel Escorsim Machado, Israel Felzenswalb, Carlos Fernando Araújo-Lima, Alyona Sukhanova, Igor Nabiev, Ralph Santos‐Oliveira,

Graphene research and applications

Graphene is one of the crystalline forms of carbon, along with diamond, graphite, carbon nanotubes, and fullerenes, and is considered as a revolutionary and innovating product. The use of a graphene-based nanolabels is one of the latest and most prominent application of graphene, especially in the field of diagnosis and, recently, in loco radiotherapy when coupled with radioisotopes. However, its biological behavior and mutagenicity in different cell or animal models, as well as the in vivo functional activities, are still unrevealed. In this study we have developed by a green route of synthesizing graphene quantum dots (GQDs) and characterized them. We have also developed a methodology for direct radiolabeling of GQDs with radioisotopes.Finally; we have evaluated in vivo biological behavior of GQDs using two different mice models and tested in vitro mutagenicity of GQDs. The results have shown that GQDs were formed with a size range of 160-280 nm, which was confirmed by DRX and Raman spectroscopy analysis, corroborating that the green synthesis is an alternative, environmentally friendly way to produce graphene. The radiolabeling test has shown that stable radiolabeled GQDs can be produced with a high yield (>90%). The in vivo test has demonstrated a ubiquitous behavior when administered to healthy animals, with a high uptake by liver (>26%) and small intestine (>25%). Otherwise, in an inflammation/VEGF hyperexpression animal model (endometriosis), a very peculiar behavior of GQDs was observed, with a high uptake by kidneys (over 85%). The mutagenicity test has demonstrated A:T to G:C substitutions suggesting that GQDs exhibits mutagenic activity.