Clarification of olive juice by α-alumina microfiltration membranes with enhanced packing density
The development of innovative designs has enabled the creation of new-generation mineral membranes with enhanced filtration packing densities, improving their competitiveness against polymeric membranes. This study evaluates the performance of two α-Al2O3 membranes with mean pore sizes of 800 and 60...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/391035 |
| Acceso en línea: | http://hdl.handle.net/10261/391035 |
| Access Level: | acceso abierto |
| Palabra clave: | Olive juice Clarification α-Al2O3 membranes Tangential flow membrane filtration Phenolic and secoiridoids compounds Microfiltration |
| Sumario: | The development of innovative designs has enabled the creation of new-generation mineral membranes with enhanced filtration packing densities, improving their competitiveness against polymeric membranes. This study evaluates the performance of two α-Al2O3 membranes with mean pore sizes of 800 and 600 nm and a filtration packing density of 184 m2.m−3, focusing on their operational parameters and the quality of olive juice clarification. Filtration with the 800 nm membrane achieved 2.4 times higher productivity than the 600 nm membrane. However, it left 14–19 NTU of haze in the final product and was more prone to fouling. In contrast, the 600 nm membrane produced fully clarified juice (<2 NTU) and was more resistant to fouling. Clarification with both membranes didn't produce significant retentions of the majority of the 29 examined phenolic compounds. However, retentions of 7.0 to 7.5 % of total dissolved substances, likely polysaccharide colloids, and complete removal of residual oil were achieved. Both membranes were capable of catalyzing spontaneous hydrolysis reactions that produced a significant increase in the contents of tyrosol, hydroxytyrosol and verbascoside, with oleacein concentration rising by up to 893 % in the clarified juices. |
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