Highlights One-step synthesis provides affordable, stable, and biocompatible nanoparticles. PEG-coated gold nanoparticles exhibited very low cytotoxicity effects. This in vivo study did not reveal hematopoietic, renal, or hepatic alterations. The histopathological analysis did not present any tissue or cellular damage. ABSTRACT Objective: To evaluate the in vitro and in vivo toxicities of polyethylene glycol-coated gold nanoparticles synthesized using a one-step process. Methods: Gold nanoparticles were prepared via a co-precipitation method using polyethylene glycol, and the synthesis product was characterized. For […]

ABSTRACT Alternative methods to the use of animals in research have been a global trend, mainly after the publication of the 3R’s principle (Replacement, Reduction, and Refinement), proposed by Russel and Burch. In the cosmetic sector, safety and efficacy assessments using animals have generated controversial debates. For this reason, in vitro research techniques are widely used to assess acute toxicity; corrosivity and irritation; skin sensitization; dermal and percutaneous absorption; repeated dose toxicity; reproductive toxicity; mutagenicity and genotoxicity; carcinogenicity; toxicokinetic studies; […]