Introduction: Recent studies have suggested that cannabidiol (CBD) could interconvert into Delta-8-and Delta-9-tetrahydrocannabinol. Materials and Methods: Thus, we tested the plasma samples of 120 healthy human subjects (60 male and 60 female), 60 in fasting and the other 60 under normal feeding conditions after acute administration of an oral solution containing CBD 300 mg. To do this, we developed a bioanalytical method to determine CBD and the presence of THC in plasma samples by Ultra-High Performance Liquid Chromatography Coupled to Tandem Mass Spectrometry. Results: The results showed that THC was not detected in plasma after the administration of CBD, and those study participants did not present psychotomimetic effects. Conclusions: The findings presented here are consistent with previous evidence suggesting that the oral administration of CBD in a corn oil formulation is a safe route for the administration of the active substance without bioconversion to THC in humans.

RESUMO.O objetivo deste artigo é caracterizar e qualificar um padrão secundário de diclofenaco de sódio como padrão de referência no controle de qualidade de medicamentos. A identidade do candidato foi confirmada por espectroscopia na região do infravermelho e sua pureza (99,63%) determinada por cromatografia líquida de alta eficiência (CLAE) por comparação com padrão primário. A qualidade do padrão secundário também foi suportada por titulação redox em meio não-aquoso, espectroscopia na região do UV-visível.Palavras-chave: espectroscopia de infravermelho, padrão de referência, CLAE. Characterization and qualification of diclofenac sodium as a secondary standardABSTRACT. This paper aimed to characterize and qualify a secondary standard of diclofenac sodium as a reference standard in the quality control of medicines. The identity of the candidate was confirmed through infrared spectroscopy and the content (99.63%) determined by high performance liquid chromatography (HPLC) by comparing with the compendial primary standard. The quality of the secondary standard was also supported by redox titration in non-aqueous media, related substances and UV spectrum by HPLC.