Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/4195
Título: Extracção e encapsulamento de compostos bioactivos do bagaço de azeitona
Outros títulos: Extraction and microencapsulation of bioactive compounds from olive oil processing solid wastes
Autor: Duarte, Cláudia Sofia Caeiro
Orientador: Beirão da Costa, Maria Luísa
Duarte, Catarina Martins
Palavras-chave: olive oil solid waste
supercritical CO2
bioactive compounds
antioxidant activity
encapsulation
spray drying
Data de Defesa: 2011
Editora: ISA/UTL
Citação: Duarte, Cláudia Sofia Caeiro - Extracção e encapsulamento de compostos bioactivos do bagaço de azeitona. Lisboa: ISA, 2011
Resumo: The food industry by-products such as olive oil processing solid waste are an important source of natural bioactive compounds. The aim of the present work was to extract bioactive compounds from olive pomace using supercritical carbon dioxide extraction and to investigate the viability of their encapsulation in a food-stuff carrier as a way of protection from antioxidant properties losses. Several supercritical extractions were performed at a 250 bar and a 40 ºC with and without pre-treatments and levels of moisture content were also tested. Yields between 8 and 12% (w/w) were achieved and fatty acid content, sterols and total poliphenolic compounds were evaluated in all supercritical extracts. Since there are a strong correlation between antioxidant activity and poliphenolic compounds, the two most representative phenols, hydroxytyrosol and tyrosol, were identified and quantified. Antioxidant activity was also investigated using ORAC and HORAC methods. Extraction of bioactive compounds from olive pomace in soxhlet apparatus were also carried out for control and yields of 13% (w/w) were achieved. Encapsulation of the most bioactive extract achieved was performed by spray-drying using inulin as the wall material and antioxidant activity was evaluated.
Descrição: Mestrado em Engenharia Alimentar - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/4195
Aparece nas colecções:BISA - Dissertações de Mestrado / Master Thesis

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Extracção e Encapsulamento dos Compostos Bioactivos do Bagaço de Azeitona.pdf2,59 MBAdobe PDFVer/Abrir


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