Barbatimão (Stryphnodendron adstringens) is a Brazilian medicinal plant known for its pharmacological properties, including healing activity related to its phenolic composition, which is chiefly given by tannins. In order to preserve its stability and bioactivity, barbatimão extracts can be incorporated into (bio-)polymeric matrixes, of which silk fibroin stands out due to its versatility and tunable properties. This work aimed to obtain barbatimão bark extract rich in phenolic compounds and evaluate its incorporation in fibroin hydrogels. From the extraction process, it was observed that the PG (propylene glycol) extract presented a higher global yield (X0) and phenolic compounds (TPC) than the ET (ethanol) extract. Furthermore, the antioxidant activity (ORAC and FRAP) was similar between both extracts. Regarding the hydrogels, morphological, chemical, thermal, and mechanical characterizations were performed to understand the influence of the barbatimão extract and the solvent on the fibroin hydrogel properties. As a result, the hydrogels containing the barbatimão PG extract (BT/PG hydrogels) showed the better physical–chemical and structural performance. Therefore, these hydrogels should be further investigated regarding their potential in medical and pharmaceutical applications, especially in wound healing.
O trabalho baseia-se em estudar o efeito de compostos não tóxicos ao meio ambiente e provenientes de recursos naturais renováveis, utilizando-os como inibidores de corrosão ambientalmente seguros para o aço AISI 304 em meio de HCl 0,1 mol/L. A avaliação da proteção à corrosão foi feita com a imersão de placas de aço em alíquotas dos extratos aquosos e etanólicos de erva mate e chá verde. O potencial de corrosão foi determinado utilizando eletrodo de calomelano saturado como referência. Na ausência de inibidores em um tempo de 60 minutos, o ensaio controle, apresentou potencial de corrosão (Ecorr) igual a -158 mV/ECS. Já em presença de extrato aquoso de erva mate, o Ecorr foi de - 138 mV/ECS e -149 mV/ECS para o extrato aquoso de chá verde. Os extratos etanólicos de erva mate e chá verde apresentaram valores de potencial de corrosão de -58 mV/ECS e -143 mV/ECS, respectivamente. Apenas o extrato etanólico da erva mate apresentou resultado significativo na inibição do processo corrosivo no metal em estudo, apresentando médias de Ecorr antes e após tratamento inibidor estatisticamente diferentes pelo teste t pareado. Assim, o extrato etanólico de erva mate apresenta potencial uso como inibidor verde de corrosão.
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