Catálogo de publicaciones - tesis
Título de Acceso Abierto
Control del desarrollo de hongos contaminantes de alimentos mediante iones dosificados por materiales microporosos
Carolina Andrea Antonia Chiericatti Juan Manuel Zamaro Vanesa Ludemman Cristina Lura José Fernández Zapata de Basilico María de la Luz
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Resumen/Descripción – provisto por el repositorio digital
The inhibitory effect of silver and copper ions incorporated in microporous matrices against fungi which are problematic in food industries was investigated. The fungal species studied were: Rhizopus oryzae, Mucor circinelloides Geotrichum candidum, Saccharomyces cerevisiae, Debaryomyces hansenii and Zygosaccharomyces rouxii. Filamentous fungi were isolated from dairy products altered at low oxygen tension whereas yeasts were obtained from altered fruit juices contained in plastic bottles. The antifungal ability of a mordenite exchanged with silver and of a copper-containing metal-organic framework, named HKUST-1 were evaluated. Tests with silver solutions and Na-mordenite were also performed, to compare the action of the metal without the interaction with the zeolite structure. Physico-chemical characterizations of the solids were performed through scanning electron microscopy (SEM), electron probe microanalysis (EPMA), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR) and atomic absorption spectroscopy (AA). It was demostrated that Ag-mordenite is effective as antifungal, being more sensitive yeasts than filamentous fungi. The most sensitive specie was Saccharomyces cerevisiae while the more resistant was Geotrichum candidum. The action is due to a release of silver ions from the zeolite matrix, which act directly on the walls of the microorganisms. This action is more efficient compared to free silver ions in solution. By the other hand, HKUST-1 exerts a strong inhibitory effect against the growth of Saccharomyces cerevisiae and Geotrichum candidum due to the ability of the MOF to release copper from its own structure, which is slowly degraded producing extraframework copper ions at the material surface.Palabras clave – provistas por el repositorio digital
Zeolite; Fungi; MOFs; Antifungal; Silver; Cooper; Zeolita; Hongos; Antifúngico; Plata; Cobre
Disponibilidad
| Institución detectada | Año de publicación | Navegá | Descargá | Solicitá |
|---|---|---|---|---|
| No requiere | 2013 | Biblioteca Virtual de la Universidad Nacional del Litoral (SNRD) |
|
Información
Tipo de recurso:
tesis
Idiomas de la publicación
- español castellano
País de edición
Argentina
Fecha de publicación
2013-11-07
