Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/3146
Título: Estudo comparativo de métodos de avaliação da capacidade antioxidante de compostos bioactivos
Autor: Pereira, Mariana Oliveira de Sousa
Orientador: Beirão da Costa, Maria Luísa
Palavras-chave: Origanum virens L.
extract
antioxidant activity
Rancimat
Quencher
Data de Defesa: 2010
Editora: ISA
Resumo: The objectives of this study concern in evaluate the antioxidant capability of potentially rich matrices. The antioxidant activity of the oregano (Origanum virens L.), essential oregano oil resulting from the hydro distillation and Soxhlet extraction, lyophilized tomato industrial waste, olive industrial waste and natural and commercial blueberry juice was evaluated. The study was started by applying the Rancimat method to oregano and its extracts observing the use of several extracts as well as its evolution through time. The Quencher method based on radical scavenging ability, allows the evolution of antioxidant ability on solids matrices avoiding by this way extraction procedures. , therefore obtaining results that are closer to reality. These methods were applied to various natural matrices. It was concluded that Quencher method allows a more rapid assessment of the activity of the compounds, but is influenced by the nature of the solid matrix. From results we can conclude that whole oregano presents a greater antioxidant power than any of its extracts, tomato and olive by-products. We can also conclude that natural blueberry juice is richer in antioxidants than commercial blueberry juice.
Descrição: Mestrado em Engenharia Alimentar - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/3146
Aparece nas colecções:BISA - Dissertações de Mestrado / Master Thesis

Ficheiros deste registo:
Ficheiro Descrição TamanhoFormato 
TESEMESTRADO3x.pdf662,77 kBAdobe PDFVer/Abrir


FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpace
Formato BibTex MendeleyEndnote Degois 

Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.