The oleoresin produced by species of genus Protium sp. is rich in alpha and beta-amyrins, two triterpenes with many pharmacogical activities. Considering the need to make the improved obtainment of these products feasible, this study sought to optimize techniques for the extraction and isolation of amyrins from resin. Two methods of extraction (maceration and sonication) with different solvents were compared to direct isolation from crude resin. The isolation of triterpenes was performed by chromatographic columns and the yields of extracts and fractions were analyzed by analysis of variance. The best extraction solvent for amyrins was hexane for both maceration and sonication methods (38.16±2.06% and 37.67±8.21%, respectively). There was no statistical difference between these methods and the direct method (32.05±2.40%). Additionally, the direct method is cheaper and more environmentally friendly. Thus, this study showed that it is possible to obtain a large quantity of amyrins by means of cheap, fast and ecological methods.
O ensino remoto, apoiado por mídias e tecnologias vem crescendo no Brasil. O contexto pandêmico fez com que essa modalidade de ensino fosse adotada de maneira emergencial. Grande parte dos estudantes não está acostumada a estudar de maneira não presencial, o que pode interferir no seu processo de aprendizagem. Dessa forma, objetivou-se identificar as estratégias de aprendizagem utilizadas por estudantes de licenciatura em Química e Biologia durantes as aulas remotas emergenciais em uma disciplina de Química Geral. A coleta de dados se deu por meio de um questionário em escala Likert. Os dados foram tratados quantitativamente e analisados qualitativamente. Os resultados mostram que as estratégias de aprendizagem cognitivas mais utilizadas pelos licenciandos se voltavam a ação de anotar o que eles consideram importante em determinado assunto. Em relação as estratégias metacognitivas (mais usadas pelos participantes), as mais frequentes foram aquelas voltadas a ler e reler textos com atenção, tentando superar a dificuldade ou para ter certeza de que estão compreendendo aquele conteúdo.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.