Effect of aqueous rosemary extract (Rosmarinus officinalis L.) on the oxidative stress of diabetic rats
Keywords:
Antioxidants, Phenolic compounds, Mellitus diabetes, Enzymes, RosemarinusAbstract
Objective
This study assessed the effect of aqueous rosemary extract on the oxidative stress of diabetic rats.
Methods
Aqueous rosemary extract was obtained by the sequential method. Total phenolic content was determined by the Folin Ciocateau method and antioxidant activity in vitro was determined by the following methods: β-carotene/linoleic acid, 2,2 Difenil-1-Picril-hidrazil and oxygen radical absorbance capacity. Male Wistar rats were distributed into 5 groups: control, diabetic, and three groups of diabetic animals treated with aqueous rosemary extract in different concentrations: 25, 50 or 100mg/kg orally for 30 days. Diabetes was induced by streptozotocin and, at the end of the experiment, blood was collected to assess the percentage of glycated hemoglobin; liver and brain tissues were collected for the determination of the antioxidant enzymes: superoxide dismutase, catalase, glutatione peroxidase and glutatione reductase.
Results
Aqueous rosemary extract contains high levels of phenolic compounds and significant total antioxidant activity in vitro according to the three methods. Aqueous rosemary extract at a concentration of 50mg/kg decreased the percentage of glycated hemoglobin and increased the activity of glutatiose peroxidase and catalase enzymes in the liver and superoxide dismutase in the brain of diabetic rats. However, no dose-response effect was observed in the other concentrations.
Conclusion
Aqueous rosemary extract presented significant antioxidant capacity in vitro attributed to its high phenolic compound content. When administered to rats at a concentration of 50mg/kg, it proved to be efficient against the oxidative stress secondary to experimental diabetes.
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Copyright (c) 2023 Ana Mara de Oliveira e SILVA, Elma Regina Silva de ANDRADE-WARTHA, Eliane Bonifácio Teixeira de CARVALHO, Alessandro de LIMA, Alexis Vidal NOVOA, Jorge MANCINI-FILHO
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