Antigenotoxic and antimutagenic effects of Myrciaria dubia juice in mice submitted to ethanol 28-day treatment.

Myrciaria dubia is a native plant from the Amazon region which produces red-purplish fruit rich in antioxidant compounds such as ascorbic acid, carotenoids, and phenolic. M. dubia fruit is used to prepare juices considered to possess high nutritional content providing health benefits. The aim of this study was to examine the ability of M. dubia juice to protect DNA against genomic instability induced by sub-acute ethanol consumption attributed to oxidative stress. Mice were treated for 28 days with juice at 25% and 50% diluted in distilled water or with the diluted combination juice plus ethanol (5 g/kg). The genotoxic/antigenotoxic and mutagenic/antimutagenic effects were assessed using comet assay in blood, liver, and kidney and micronucleus (MN) test with bone marrow. In addition, the mutagenicity was also evaluated using Salmonella/microsome assay. Phytochemical compounds were determined using HPLC/PDA/MS/MS. The juice did not induce genotoxic effects in blood, kidney, and liver cells at both doses. In combination with ethanol, the juice reduced the alcohol-mediated DNA damage in all tissues analyzed. Further, the juice did not produce mutagenic effects and decreased mutagenicity induced by ethanol in the bone marrow. The anthocyanins were major compounds detected by HPLC/PDA/MS/MS, which modulated genotoxic and mutagenic effects initiated by ethanol and at least in part appeared responsible for the observed antigenotoxic and antimutagenic effects of M. dubia juice.

Análise fitoquímica e das atividades citotóxica, antioxidante, e antibacteriana das flores de Tabebuia serratifolia (Vahl) Nicholson / Phytochemical analysis and antioxidant, cytotoxic and antibacterial activities of Tabebuia serratifolia flowers (Vahl) Nicholson'

O presente estudo objetivou realizar a análise fitoquímica e avaliar as atividades antioxidante, citotóxica e antimicrobiana das flores de Tabebuia serratifolia (Ipê amarelo). A identificação de metabólitos secundários foi realizada por meio de testes qualitativos colorimétricos, a citotoxicidade pelo teste de letalidade frente à Artemia Salina, a atividade antioxidante foi avaliada pela capacidade de desativação do radical 2,2-difenil1-picrilhidrazila (DPPH) e a atividade antibacteriana foi avaliada pelo método de difusão em disco, frente aos microrganismos Escherichia coli, Staphylococcus aureus e Shigella sp. Os resultados revelaram a presença de flavonoides, saponinas e triterpenos e/ou esteroides. Observou-se a citotoxicidade (DL50=679 µg/mL), atividade antioxidante (CE50=86 mg/mL) e atividade antibacteriana sobre todas as cepas testadas (CIM=25 mg/mL).(AU)

The present study aimed to analyze the phytochemical compounds, and evaluate the cytotoxic, antioxidant and antimicrobial activities of Tabebuia serratifolia flowers. The phytochemical analysis was performed using qualitative colorimetric tests, the cytotoxicity by the Artemia salina lethality test, the antioxidant activity was evaluated by the ability to deactivate the 2.2-diphenyl-1-picrylhydrazyl radical (DPPH) and the antibacterial activity was evaluated by the disc diffusion method, against the microorganisms Escherichia coli, Staphylococcus aureus and Shigella sp. The results revealed the presence of flavonoids, saponins and triterpenes or steroids. It was observed the cytotoxicity (LD50=679 µg/mL), antioxidant activity (EC50=86 mg/mL) and antibacterial activity on all strains tested.(AU)