SciELO - Scientific Electronic Library Online

 
vol.10 número2Whiskers de celulosa a partir de residuos agroindustriales de banano: Obtención y caracterizaciónEstimador algebraico diferencial para el monitoreo de una clase de biorreactores con modelos parcialmente conocidos índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Revista mexicana de ingeniería química

versão impressa ISSN 1665-2738

Resumo

QUINTANILLA-CARVAJAL, M.X. et al. Morphometric characterization of spray-dried microcapsules before and after α-tocopherol extraction. Rev. Mex. Ing. Quím [online]. 2011, vol.10, n.2, pp. 301-312. ISSN 1665-2738.

Microcapsules were obtained by spray-drying o f α-tocopherol (AT) - in - water emulsions subjected to single and double atomization yielding single atomized microcapsules (SAM) and double atomized microcapsules (DAM) which had different core to wall material ratios. Micrographs of whole and AT extracted of SAM and DAM obtained from Environmental Scanning Electron Microscopy (ESEM) were image analyzed and the Feret diameter, projected area, perimeter, maximum perimeter, shape factor and Fractal Dimension of contour (FDc) and texture (FDt) were determined. Whole DAM presented higher FDc and FD t than SAM, while SAM presented higher FDc values for all the microcapsules and higher DFt values for the AT to wall materials ratios 1:4 after the AT extraction. Most of the microcapsules displayed significantly different perimeter but non- significant projected areas, whereas the extracted microcapsules tended not to show significant differences between these two parameters.

Palavras-chave : morphometric parameters; spray drying; image analysis; alpha tocopherol.

        · resumo em Espanhol     · texto em Inglês     · pdf em Inglês