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Registros recuperados: 60
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A hybrid electronic tongue for direct classification of baby liquid foods with or without gluten IPB - Escola Superior Agrária
Peres, António M.; Dias, L.G.; Veloso, Ana C.; Sousa, Mara E.B.C.; Machado, Adélio A.S.C..
Tipo: ConferenceObject
Ano: 2011 URL: http://hdl.handle.net/10198/6399
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A hybrid electronic tongue for direct classification of baby liquid foods with or without gluten IPB - Escola Superior Agrária
Peres, António M.; Dias, L.G.; Veloso, Ana C.; Sousa, Mara E.B.C.; Machado, Adélio A.S.C..
People suffering from celiac disease are gluten intolerant and inadvertent ingestion of gluten proteins must be avoided. Several techniques have been proposed to detect/quantify gluten proteins in foodstuffs: immunochemical methods, mass tandem spectrometry and polymerase chain reaction as well as gluten sensors [1]. Recently, a potentiometric electronic tongue (ET) with lipo/polymeric membranes has been used to detect gliadins, which are gluten proteins, in foodstuffs [2]. However, the use of these techniques requires the previous extraction of gluten proteins. This step can be a possible drawback since it is not possible to guarantee that the extraction has a 100% yield since the protein types overlap in solubility and extractability [3]. In this work,...
Tipo: ConferenceObject
Ano: 2011 URL: http://hdl.handle.net/10198/6400
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An electronic tongue for beer differentiation IPB - Escola Superior Agrária
Dias, L.G.; Peres, António M.; Barcelos, T.P.; Morais, Jorge Sá; Machado, A.A.S.C..
In this work an electronic tongue, based on a potentiometric solid-state mufti-sensor array, with 36 polymeric membranes, was built for developing an analytical tool to apply in process monitoring and quality control. As a first approach, this tool was applied together with a supervised pattern recognition tool to semi-quantitatively differentiate beers with different alcoholic levels.
Tipo: ConferenceObject
Ano: 2009 URL: http://hdl.handle.net/10198/3026
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An electronic tongue for gliadins semi-quantitative detection in foodstuffs IPB - Escola Superior Agrária
Peres, António M.; Dias, L.G.; Veloso, Ana C.A.; Meirinho, Sofia G.; Morais, Jorge Sá; Machado, A.A.S.C..
An all-solid-state potentiometric electronic tongue with 36 polymeric membranes has been used for the first time to detect gliadins, which are primarily responsible for gluten intolerance in people suffering from celiac disease. A linear discriminant model, based on the signals of 11 polymeric membranes, selected from the 36 above using a stepwise procedure, was used to semi-quantitatively classify samples of a “Gluten-free” foodstuff (baby milked flour), previously contaminated with known amounts of gliadins (<10, 20–50 or >50 mg/kg), as “Gluten-free”, “Low-Gluten content” or “Gluten-containing”. For this food matrix, the device had sensitivity towards gliadins of 1–2 mg/kg and overall sensitivity and specificity of 77% and 78%, respectively....
Tipo: Article Palavras-chave: Gliadins; Electronic tongue; Linear discriminant analysis; Celiac disease; Protein analysis.
Ano: 2011 URL: http://hdl.handle.net/10198/3819
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An electronic tongue for honey classification IPB - Escola Superior Agrária
Dias, L.G.; Peres, António M.; Vilas-Boas, Miguel; Rocha, Maria A.; Estevinho, Leticia M.; Machado, A.A.S.C..
An electronic tongue system was developed based on 20 all-solid-state potentiometric sensors and chemometric data processing, with polymeric membranes applied on solid conducting silver-epoxy supports and a Ag=AgCl reference electrode. The sensor array was applied to 52 commercial honey samples obtained randomly from different regions of Portugal. These samples were analysed independently for their pollen profiles by biological techniques and the data collected with the tongue were evaluated for discrimination of the samples with multivariate statistical methods (principal component analysis and linear discriminant analysis), to investigate whether the device may provide an analytical alternative for classification of honey samples with respect to pollen...
Tipo: Article Palavras-chave: Honey; Pollen; Electronic tongue; Multivariate analysis.
Ano: 2008 URL: http://hdl.handle.net/10198/1027
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An electronic tongue for juice level evaluation in non-alcoholic beverages IPB - Escola Superior Agrária
Peres, António M.; Dias, L.G.; Barcelos, T.P.; Morais, Jorge Sá; Machado, A.A.S.C..
An electronic tongue with 36 cross-sensibility polymeric membranes was built and used for semi-quantitative analysis of beverages. The objective was to differentiate 4 non-alcoholic beverage groups with different added fruit juice contents: higher than 30%, between 14%-30%, 5%-10% and 0.1%-2%. A set of 16 Portuguese beverages (4 for each group), purchased in commercial supermarkets, was analyzed and the respective signal profiles recorded by the electronic tongue device. The data obtained were treated by stepwise linear discriminant analysis, allowing a 100% overall correct classification for the original grouped cases and a 93.8% for the “leaving one-out” cross-validation procedure
Tipo: Article Palavras-chave: Discriminant analysis; Electronic tongue; Fruit juice level; Non-alcoholic beverages; Polymeric membranes.
Ano: 2009 URL: http://hdl.handle.net/10198/2232
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An electronic tongue for juice level evaluation in non-alcoholic beverages IPB - Escola Superior Agrária
Peres, António M.; Dias, L.G.; Barcelos, T.P.; Morais, Jorge Sá; Machado, A.A.S.C..
An electronic tongue with 36 cross-sensibility polymeric membranes was built and applied for qualitative beverage analysis.
Tipo: ConferenceObject
Ano: 2009 URL: http://hdl.handle.net/10198/3028
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An electronic tongue taste evaluation: identification of goat milk adulteration with bovine milk IPB - Escola Superior Agrária
Dias, L.G.; Peres, António M.; Veloso, Ana C.A.; Reis, F.S.; Vilas-Boas, Miguel; Machado, A.A.S.C..
An electronic tongue with 36 cross-sensibility sensors was built allowing a successful recognition of the five basic taste standards, showing high sensibility to acid, salty and umami taste substances and lower performance to bitter and sweet tastes. The taste recognition capability was afterwards tested in the detection of goat milk adulteration with bovine milk, which is a problem for the dairy industry. This new methodology is an alternative to the classical analyticalmethods used to detect caprine milk adulterations with bovine milk, being a simpler, faster and economical procedure. The different signal profiles recorded by the e-tongue device together with linear discriminant analysis allowed the implementation of a model that could distinguish...
Tipo: Article Palavras-chave: Electronic tongue; Taste standards; Milk adulteration; Cow milk; Goat milk; Principal component analysis; Linear discriminant analysis.
Ano: 2009 URL: http://hdl.handle.net/10198/1029
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Antioxidant and antimicrobial effects of phenolic compounds extracts of Northeast Portugal honey IPB - Escola Superior Agrária
Estevinho, Leticia M.; Pereira, A.P.; Moreira, Leandro; Dias, L.G.; Pereira, Ermelinda.
Phenolic compounds of dark and clear honeys from Trás-os-Montes of Portugal were extracted with Amberlite XAD-2 and evaluated for their antioxidant and antimicrobial activities. The antioxidant effect was studied using the in vitro test capacity of scavenge the 2,2-diphenyl-1-picryhydrazyl (DPPH) free radical and of reducing power of iron (III)/ferricyanide complex. The antimicrobial activity was screened using three Gram-positive bacteria (Bacillus subtilis, Staphylococcus aureus, Staphylococcus lentus) and three Gram-negative bacteria (Pseudomonas aeruginosa, Klebsiella pneumoniae and Escherichia coli). The results obtained from the partial identification of honey phenolic compounds by high-performance liquid chromatography with a diode array...
Tipo: Article Palavras-chave: Honey; Phenolic compounds; Antioxidant activity; Antimicrobial activity.
Ano: 2008 URL: http://hdl.handle.net/10198/2942
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Antioxidant properties, total phenols and pollen analysis of propolis samples from Portugal IPB - Escola Superior Agrária
Moreira, Leandro; Dias, L.G.; Pereira, J.A.; Estevinho, Leticia M..
Pollen analysis, total phenols content and antioxidant activity were studied for the first time in Portuguese propolis samples from Bornes and Fundão regions. Total phenols content was determined by colorimetric assay and their amount was of 329 mg/g of GAE in Bornes sample and 151 mg/g of GAE in Fundão propolis. The antioxidant capacity of propolis extracts was assessed through the scavenging effects on DPPH (2,2- diphenyl-1-picrylhydrazyl) and reducing power of iron (III)/ ferricyanide complex assays. A concentration- dependent antioxidative capacity was verified in DPPH and reducing power assays. Low values of EC50 on DPPH scavenging assay were obtained for Bornes and Fundão propolis (of 6.22 lg/mL and 52.00 lg/mL, respectively). For reducing power the...
Tipo: Article Palavras-chave: Propolis; Polinic analysis.
Ano: 2008 URL: http://hdl.handle.net/10198/4432
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Aplicação de uma língua electrónica na classificação de méis monoflorais IPB - Escola Superior Agrária
Morais, L.; Dias, L.G.; Peres, António M.; Rocha, A.C.; Estevinho, Leticia M.; Machado, A.A.S.C..
Analisou-se o perfil polínico de 51 amostras de mel nacional. Os pólens mais frequentes no mel são originários das plantas dos géneros Lavandula, Cistus, Echium, Erica, Castanea, Thymus, Prunus, Cytisus, Carduus, Trifolium e Citrus. Considerando a classificação de mel monofloral de Lavandula (pólen predominante superior a 15%), de Erica e de Echium (pólen predominante superior a 45%) seleccionaram-se 38 méis monoflorais: 18, 9 e 11 destes méis foram classificados como méis monoflorais de Lavandula, Erica e Echium, respectivamente. Contudo há méis que podem ser classificados como mel monofloral de dois géneros de pólen (Lavandula-Echium, Erica-Lavandula, Echium-Lavandula). Os méis monoflorais foram analisados com um sistema de multi-sensores...
Tipo: Article Palavras-chave: Mel; Pólen; Língua electrónica; Análise multivariada.
Ano: 2007 URL: http://hdl.handle.net/10198/3031
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Application of an electronic tongue to detect gliadins in gluten-free foods IPB - Escola Superior Agrária
Peres, António M.; Dias, L.G.; Veloso, Ana C.A.; Meirinho, S.G.; Morais, Jorge; Machado, A.A.S.C..
Celiac disease is an autoimmune-mediated disorder triggered in genetically susceptible individuals by the ingestion of some gluten proteins, namely gliadins. To prevent inadvertent gluten consumption, the Commission Regulation (EC) N°41/2009 will implement labeling foods as ‘gluten-free” or “low-gluten content.
Tipo: ConferenceObject
Ano: 2010 URL: http://hdl.handle.net/10198/3020
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Assessment of goat fat depots using ultrasound technology and multiple multivariate prediction models IPB - Escola Superior Agrária
Peres, António M.; Dias, L.G.; Joy, M.; Teixeira, A..
Assessment of fat depots for several goat body parts is an expensive and time-consuming task requiring a trained technician. Therefore, the establishment of models to predict fat depots based on data requiring simpler and easier procedures, such as ultrasound measurements, that could be carried out in vivo, would be a major advantage. An interesting alternative to the use of multiple linear regression models is the use of partial least squares or artificial neural network models because they allow the establishment of one model to simultaneously predict different fat depots of interest. In this work, the applicability of these models to simultaneously predict 7 goat fat depots (subcutaneous fat, intermuscular fat, total carcass fat, omental fat, kidney and...
Tipo: Article Palavras-chave: Artificial neural network; Carcass fat composition prediction; Goat; Partial least squares; Ultrasound technology.
Ano: 2010 URL: http://hdl.handle.net/10198/5197
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Avaliação da dinâmica do azoto no solo numa pastagem biodiversa através da sementeira de espécies nitrófilas em micro-talhões no interior da pastagem IPB - Escola Superior Agrária
Rodrigues, M.A.; Gomes, Vanessa; Dias, L.G.; Aguiar, Carlos; Pires, Jaime; Arrobas, Margarida.
Tipo: ConferenceObject
Ano: 2010 URL: http://hdl.handle.net/10198/3007
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Avaliação do perfil em açúcares no mel português por HPLC IPB - Escola Superior Agrária
Vilas-Boas, Miguel; Correia, Daniela M.; Dias, L.G..
Tipo: ConferenceObject
Ano: 2007 URL: http://hdl.handle.net/10198/5684
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Avaliação dos Níveis de Contaminação dos Antibióticos no mel Português IPB - Escola Superior Agrária
Correia, Daniela M.; Vilas-Boas, Miguel; Dias, L.G..
A presença residual dos antibióticos no mel é um problema actual com implicações negativas, principalmente comerciais, desde que, de acordo com a legislação europeia, a ocorrência de antibióticos em. amostras do mel é proibida
Tipo: ConferenceObject
Ano: 2006 URL: http://hdl.handle.net/10198/5879
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Avaliação simultânea de depósitos adiposos em caprinos, recorrendo a ultrasonografia em tempo real (UTR) em associação com modelos de redes neuronais (ANN) IPB - Escola Superior Agrária
Teixeira, A.; Dias, L.G.; Pereira, Etelvina; Peres, António M..
Recentemente foram realizados estudos para melhorar a previsão da composição corporal ou carcaças de caprinos. Com a perspectiva de usar um modelo exclusivo para estimar a composição corporal, baseado em um número reduzido de estimadores, foi proposto um modelo usando redes neurais artificiais. Neste sentido o principal objectivo do presente trabalho será demonstrar a necessidade de organizar uma rede mundial para construir um grande banco de dados, de composição corporal e carcaça, para as raças mais importantes de caprinos em graus diferentes graus de maturidade, que proporcione o desenvolvimento de modelos gerais, robustos e fiáveis, bem como para implementar uma técnica on-line moderna e objectiva para a avaliação e classificação comercial.
Tipo: ConferenceObject
Ano: 2010 URL: http://hdl.handle.net/10198/5236
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Bee propolis effect on protection of RBCs membrane integrity IPB - Escola Superior Agrária
Moreira, Leandro; Rogão, Mónica; Pereira, A.P.; Morais, M.; Costa, Bruno; Dias, L.G.; Dias, Teresa; Estevinho, Leticia M..
Propolis is a resinous substance collected from plants by bees. The propolis composition depends on the surrounding vegetation, the season, and the area from which derive. This hive product usually contains a variety of chemical compounds such as polyphenols (flavonoids, phenolic acids and esters), steroids, and amino acids. The hereditary spherocytosis (HS) is a congenital hemolytic anemia, with origin in the modification of membrane proteins of erythrocytes, which leads to increased susceptibility to hemolysis and a decrease of the cell over-life.
Tipo: ConferenceObject
Ano: 2009 URL: http://hdl.handle.net/10198/3029
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Bee propolis effect on protection of RBC’s membrane integrity IPB - Escola Superior Agrária
Moreira, Leandro; Pereira, Ana Paula; Morais, Margarida; Costa, Bruno; Dias, L.G.; Dias, Teresa; Estevinho, Leticia M..
Propolis is a resinous substance collected from plants by bees. The propolis composition depends on the surrounding vegetation, the season, and the area from which derive. This hive product usually contains a variety of chemical compounds such as polyphenols (flavonoids, phenolic acids and esters), steroids, and amino acids. The hereditary spherocytosis (HS) is a congenital hemolytic anemia, with origin in the modification of membrane proteins of erythrocytes, which leads to increased susceptibility to hemolysis and a decrease of the cell over-life. The HS is the most common red blood cell (RBC) membrane disorder in European Caucasians, with a prevalence of roughly 200-300 per 106, and to Japanese population 5.7-20.3 per 106. The aim of the present work...
Tipo: ConferenceObject
Ano: 2009 URL: http://hdl.handle.net/10198/5098
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Caracterização do mel de Trás-os-Montes IPB - Escola Superior Agrária
Estevinho, Leticia M.; Calhelha, Ricardo C.; Barros, Susana; Rocha, Amélia; Dias, L.G..
A história dos produtos da colmeia remonta a tempos imemoriais, sendo o mel o primeiro a ser utilizado pelo homem_ "Substância açucarada produzida pelas abelhas melíferas a partir do néctar das flores ou de secreções provenientes de outras partes vivas da planta ou que sobre ela se encontram e que as abelhas recolhem, transformam e combinam com substâncias especificas próprias, armazenam e deixam amadurecer no favo da colmeia (N.RE., 1969).
Tipo: ConferenceObject
Ano: 2004 URL: http://hdl.handle.net/10198/5858
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