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The Barbatimão is a tree which bark is rich in tannin. It is used on popular medicine as a wound healing agent, in the treatment of gastric lesions, as anti-leishmanial agent and as anti-inflammatory. Red blood cells (RBC) are labeled with technetium-99m (Tc-99m) and are utilized in many procedures in nuclear medicine. Some authors have reported that drugs (natural and synthetic) can alter the labeling of RBC with Tc-99m. This study evaluates the effect of barbatimão infusion on the labeling of red blood cells (RBC) and plasma (P) proteins with Tc-99m. Heparinized blood from Wistar rats was incubated with NaCl 0.9% as control and different concentrations of barbatimão infusion. Following the addition of stannous chloride (SnCl2), as reducing agent, and Tc-99m, as sodium pertechnetate, the blood samples were centrifuged. P and RBC were separated and were also precipitated with trichloroacetic acid 5%. Insoluble (IF-P and IF-RBC) fractions were isolated. The percentage of radioactivity in all the samples was determined. All the barbatimão infusion concentrations decreased the labeling of RBC, IF-P and IF-RBC. We can speculate that the barbatimão infusion interfered on the labeling of RBC due to the redox properties and/or it can also act as a chelator of the stannous ion

Effect of barbatimão [Stryphnodendron adstringens (Mart.) Coville] infusion on the labling of blood elements with technetium-99m