Pigmentos vegetais: uma alternativa para o ensino de química utilizando a técnica de cromatografia

Abstract

The objective was to use the trial from the subject plant pigments, in order to assess the improvement in student learning. The study was conducted with high school students at a private school in the city of Rondon, Paraná. For this, two questionnaires were applied, where 66 students were interviewed. First, an exhibition-dialogue-based lecture was given in order to introduce the topic plant pigments and demonstrate their main classes. Later, a questionnaire was passed. Then a practical activity on the subject was held. For the extraction of plant pigments, samples beet, cabbage and carrots were used. After alcoholic extraction of these materials, chromatography technique on paper was made for the separation of these compounds, and then evaluated through the second questionnaire, student learning. The results were satisfactory, it was observed that the practice methodology assisted students in obtaining further compression on the subject. Therefore, the trial may be a viable alternative to chemical education, and is a good strategy for science education.