Encontrados 15 documentos, a visualizar página 1 de 2
TRENDS ON ANALYTICAL METHODS FOR RESVERATROL, A MAJOR BIOACTIVE
Cabrita, Maria João; Martins, Nuno; Soares, Bruno; Costa Freitas, Ana Maria; Garcia, RaquelResveratrol (3,5,4-trans-trihydroxystilbene) is a member of the stilbene group of phenolic compounds, comprising two aromatic rings linked by an ethylene bridge and is considered one of the most promising bioactive compounds due to its bioactivity. Wine is one of the main source of this bioactive compound in Mediterranean diet. Several authors have dedicated their research to the relationship between diet and h...
Olive oil composition: volatiles compound
Gomes da Silva, Marco; Costa Freitas, Ana Maria; Cabrita, Maria Joao; Garcia, Raquelvolatile composition of olive oils
Multivariate statistical approaches for wine classification based on low molecu...
Cabrita, Maria Joao; Aires de Sousa, Joao; Gomes da Silva, Marco; Rei, Fernando; Costa Freitas, Ana MariaBackground and Aims: Phenolic compounds influence the colour, flavour and astringency of wines. These compounds are extracted into the wine during grape fermentation and maceration and thus the winemaking process is the main factor affecting the phenolic content of wines, besides the varietal factor. In this work, we aimed to apply self organizing maps to investigate the relationships between the profile of phe...
The conversion of hydroxycinnamic acids into volatile phenols (in a synthetic m...
Cabrita, Maria Joao; Palma, Vera; Patão, Raquel; Costa Freitas, Ana MariaThe conversion of p-coumaric acid, ferulic acid, and caffeic acid into 4-ethylphenol, 4-ethylguaiacol and 4-ethylcatechol was studied in Dekkera bruxellensis ISA 1791 under defined conditions in a synthetic medium and in a red wine. Liquid chromatography (HPLC-DAD) was used to quantify the phenolic acids, and gas chromatography (GC) coupled to a FID detector was used to quantify volatile phenols using a novel a...
Sampling and sample preparation techniques for the determination of volatile co...
Costa Freitas, Ana Maria; Gomes da Silva, Marco; Cabrita, Maria JoaoChemistry of Volatile Components of Grape Juice, Wine, and Alcoholic Beverages Extraction Techniques Solvent-Based Sample Preparation Techniques LLE Enhancement of Solvent Extraction Power SPE Sorptive Sample Preparation Techniques Headspace Purge and Trap SPME SBSE Preparative HPLC and SFE as a Multidimensional Preparation Tool for Sample Fractionation
Gas chromatography in analysis of compounds released from wood into wine
Cabrita, Maria João; Garcia, Raquel; Martins, Nuno; Gomes da Silva, Marco; Costa Freitas, Ana MariaWood has been used in alcoholic beverages for centuries, mainly as material for containers used for alcoholic beverages aging. Recently OIV (Organisation International de la Vigne et du Vin) approved the use of chips (Resolution oeno 3/2005) and staves as alternatives for barrels. These practices are being rapidly spread among winemakers. The increased used of these alternatives are mainly related to low invest...
Application of Molecularly Imprinted Polymers for the
Garcia, Raquel; Cabrita, Maria Joao; Costa Freitas, Ana MariaThe increasing application of pesticides for agricultural purposes involves serious risk to the environment and human health due to either exposure or through residues in food and drinking water. Since food safety is of mandatory importance there is a growing interest on the development of selective, simple, rapid, cost-effective and reliable analytical methodologies in order to ensure that pesticides residues ...
OS FENOIS VOLATEIS E OS SEUS PRECURSORES EM SOLUÇÕES MODELO E EM VINHO
Cabrita, Maria Joao; Patao, Raquel; Costa Freitas, Ana MariaA produção de fenóis voláteis tem causado grande preocupação na indústria vitivinícola por ser responsável pela introdução de aromas desagradáveis que afectam a qualidade dos vinhos. Os etilfenóis, resultantes da degradação dos ácidos hidroxicinâmicos devido à actividade microbiana, conferem aos vinhos um aroma a estrebaria quando presentes em concentrações elevadas. Este trabalho teve como principal objectivo ...
Comprehensive Two-Dimensional Gas Chromatography for Fingerprint Pattern Recogn...
Costa Freitas, Ana Maria; Gomes da Silva, Marco; Vaz-Freire, Luis TorresO artigo aplica a Cromatografia multidimensional para a caracterixzação de voláteis em azeites de variedades portuguesas, aplicando um software de reconhecimento de imagem Image J
Analytical characteristics of olive oils produced by two different extraction t...
Costa Freitas, Ana Maria; Vaz-Freire, LuÃs; Gouveia, José M.Impacto da tecnologia de extracção nas características analíticas dos azeites
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