| Revue: | Quimica nova |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000200284 |
| ISSN: | 0100-4042 |
| Autores: | Okumura, Fabiano1 Soares, Marlon Herbert Flora Barbosa Cavalheiro, Eder Tadeu Gomes |
| Instituciones: | 1Universidade Federal de Sao Carlos, Departamento de Quimica, Sao Carlos, Sao Paulo. Brasil |
| Año: | 2002 |
| Periodo: | Jul-Ago |
| Volumen: | 25 |
| Número: | 4 |
| Paginación: | 680-683 |
| País: | Brasil |
| Idioma: | Portugués |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, divulgación |
| Resumen en inglés | The use of natural dyes to demonstrate principles of paper chromatography is proposed. Extraction of the coloring compounds were performed in order to obtain the aglycone form of the anthocyanins present in the crude extracts. Separations were carried out on chromatographic paper with BAW (butanol/acetic acid/water) as mobile phase and the results compared with literature data. The crude extracts were obtained from Tibouchina granulosa, Rododhendron simsii, Impatiens walleriana flowers which are wildely found in Brazil and Phaseolus vulgaris L. grains skin which is the principal ingredient of the world famous "feijoada". Such species were chosen in order to attract the students attention since they are present in their quotidian, in agreement with the new proposals for Brazilian education |
| Disciplinas: | Educación, Química |
| Palabras clave: | Educación superior, Química analítica, Química de alimentos, Pigmentos, Pigmentos naturales, Cromatografía, Cromatografía en papel, Enseñanza, Educación química, Antocianinas, Enseñanza experimental |
| Keyword: | Education, Chemistry, Higher education, Analytical chemistry, Food chemistry, Pigments, Natural pigments, Chromatography, Paper chromatography, Teaching, Chemical education, Anthocyanins, Experimental teaching |
| Texte intégral: | Texto completo (Ver HTML) |
