| Revista: | Brazilian journal of chemical engineering |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000308896 |
| ISSN: | 0104-6632 |
| Autors: | Viana, L.M1 Freitas, M.R Rodrigues, S.V2 Baumann, W3 |
| Institucions: | 1Universidade Federal Fluminense, Departamento de Quimica Organica, Niteroi, Rio de Janeiro. Brasil 2Universidade Federal Fluminense, Departamento de Quimica Analitica, Niteroi, Rio de Janeiro. Brasil 3Universitat Mainz, Institut fur Physikalische Chemie, Mainz, Rheinland-Pfalz. Alemania |
| Any: | 2003 |
| Període: | Sep |
| Volum: | 20 |
| Número: | 3 |
| Paginació: | 317-325 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, aplicado |
| Resumen en inglés | The solubility of lapachol in supercritical CO2 was determined at 40°C and pressures between 90 and 210 bar. Supercritical fluid extraction of lapachol and some related compounds by CO2 from Tabebuia avellanedae wood is compared to Soxhlet extraction with different solvents. A standard macroscale (100-200 g wood) and a microscale (~10 mg wood) experimental setup are described and their results are compared. The latter involved direct spectrophotometric quantification in a high-pressure autoclave with an integrated optical path and a magnetic stirrer, fitted directly into a commercial spectrophotometer. The relative amount of lapachol extracted by supercritical CO2 at 40°C and 200 bar was about 1.7%, which is similar to the results of Soxhlet extractions. Lower contents of alpha- and beta-lapachone as well as dehydro-alpha-lapachone are also reported |
| Disciplines | Química |
| Paraules clau: | Fitoquímica, Química orgánica, Lapachol, Extracción supercrítica, Dióxido de carbono, Tabebuia avellanedae |
| Keyword: | Chemistry, Organic chemistry, Phytochemistry, Lapachol, Supercritical extraction, Carbon dioxide, Tabebuia avellanedae |
| Text complet: | Texto completo (Ver HTML) |
