Browsing by Author "Antunes, Carlos Alberto Lopes"
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- Assessing the viability of enhancing brandy quality through the utilization of a dual-wood blendPublication . Antunes, Carlos Alberto Lopes; Pedro, Soraia; Garcia, C.; Santos, M.; Claro, V.; Caldeira, Ilda; Anjos, O.O envelhecimento de aguardentes com madeira é um processo tecnológico valorizador da qualidade final de bebidas. Nesta fase a aguardente adquire novos aromas, melhora as suas características sensoriais e adquire cor característica, que é valorizada pelo consumidor. A aguardente de mel é um subproduto da apicultura obtido pela fermentação do mel e com características aromáticas diferenciadoras1.
- Characterisation of low molecular weight compounds of strawberry tree (Arbutus unedo L.) fruit spirit aged with oak woodPublication . Anjos, O.; Antunes, Carlos Alberto Lopes; Alves, Sheila Oliveira; Canas, Sara; Caldeira, IldaThere is a trend towards the commercialisation of strawberry tree fruit spirit (AUS) with wood ageing, motivated by its favourable sensory characteristics. Additionally, further studies are necessary to elucidate the optimal conditions regarding ageing time and toasting level. This study evaluated the changes in colour and low molecular weight compounds (LMWC) of AUS aged for three and six months using oak wood (Quercus robur L.) with light, medium and medium plus toasting levels. For this purpose, phenolic acids (gallic, ellagic, ferulic and syringic acids), phenolic aldehydes (vanillin, syringaldehyde, coniferaldehyde and sinapaldehyde) and furanic aldehydes (furfural, 5-hydroxymethylfurfural and 5-methylfurfural) were quantified using the HPLC method. Chromatic characteristics, colour sensory analysis and total polyphenol index were also analysed. Fourier transform near-infrared spectroscopy (FT-NIR) was used to discriminate between samples. The results emphasized the favourable effect of oak wood contact on enhancing the colour and enriching AUS with low molecular weight compounds (LMWC). AUS aged in medium toasted wood exhibits high levels of total phenolic index, 5-hydroxymethylfurfural, furfural, coniferaldehyde, sinapaldehyde, sum LMWC and chromatic characteristics b* and C. Concentrations of syringaldehyde, ellagic acid, vanillin and syringic acid and a lighter colour (a* chromaticity coordinates) are higher in AUS aged with slightly more toasted wood. Nearly all analysed parameters showed an increase with ageing time. The FT-NIR technique allowed for the differentiation of aged AUS, focusing more on ageing time than on toasting level.
- Characterization of a spirit beverage produced with strawberry tree (Arbutus unedo L.) fruit and aged with oak wood at laboratorial scalePublication . Anjos, O.; Pedro, Soraia; Caramelo, Débora; Semedo, Andreia; Antunes, Carlos Alberto Lopes; Canas, Sara; Caldeira, IldaArbutus unedo spirit is a valuable product in Mediterranean countries. This spirit is usually marketed in Portugal without wood ageing. This work aims to characterize the ageing effect on the Arbutus unedo spirit, for three and six months with oak wood (Quercus robur L.) submitted to different toasting levels, based on its chemical composition and its sensory properties. For this purpose, several parameters were analysed: acidity, pH, dry extract, and volatile compounds (methanol, acetaldehyde, ethyl acetate and fusel alcohols). The volatile compounds were identified by GC-MS and quantified by GC-FID. Sensory analysis was performed by a trained panel, who have profiled this beverage, as well as the changes acquired during ageing. Spectroscopic techniques, namely FTIR–ATR, were applied to discriminate the different beverages produced. The results highlighted an increase in Arbutus unedo spirit’s quality with the wood contact, mainly based on the sensory attributes. Additionally, they showed that the best beverages were produced using oak wood with medium toasting levels during three months of ageing
- Characterization of mineral composition and nutritional value of acacia green podsPublication . Pedro, Soraia; Antunes, Carlos Alberto Lopes; Monteiro, M.C.H. Carmo; Pitacas, F.I.; Gonçalves, Joana; Gominho, Jorge; Gallardo, Eugenia; Anjos, OThe Acacia genus is considered one of the most invasive taxa in some habitats, namely coastal dunes, maritime calcareous soils, fresh lands in the valleys, mountainous areas, and the banks of watercourses and roadsides. In Portugal, the severity risk is very high, so this study aimed to evaluate the nutritional and mineral contents of the green pods as a potential source for livestock feeds and soil fertilizer because, as far as we know, there is no use for this species. The seven different species of Acacia (Acacia mearnsii Link, Acacia longifolia (Andrews) Willd, Acacia melanoxylon R. Br., Acacia pycnantha Bentham, Acacia dealbata Link., Acacia retinodes Schlecht, and Acacia cyclops A. Cunn. ex G. Don fil) were evaluated. The results showed that Acacia green pods have a high protein, fibre and minerals content, especially in potassium (K), calcium (Ca) and magnesium (Mg). All species present a different profile of the studied parameters, suggesting different potentials for their future use. Near-infrared spectroscopy was a potential tool to predict the earlier quality of the Acacia green pods to better select the raw material for the different applications.
- Determinação de canabinóides em amostras de urina por microextração em seringa empacotada e cromatografia gasosa-espetrometria de massaPublication . Rosendo, Luana M.; Rosado, Tiago; Oliveira, P.; Simão, Ana Y.; Antunes, Carlos Alberto Lopes; Anjos, O.; Margalho, C.; Costa, S.; Passarinha, Luís A.; Barroso, M.; Gallardo, EugeniaA canábis é a substância ilícita mais frequentemente consumida a nível mundial. Em laboratórios de análise de drogas. A urina é uma das amostras mais utilizadas para a deteção de canabinóides.
- Discrimination of different monovarietal wines by FTIR-ATRPublication . Antunes, Carlos Alberto Lopes; Carrilho, Cláudia; Peres, Maria de Fátima; Queirós, Rodolfo; Gouveia, Cecília; Teixeira, M.C.C.; Ramos, António Santos; Anjos, O.Discrimination of different monovarietal wines by FTIR-ATR.
- Grape composition during ripening, in two cultivars and different sites of "Beira Interior" regionPublication . Ramos, António Santos; Valério, Fátima Alexandra; Gouveia, Cecília; Antunes, Carlos Alberto Lopes; Teixeira, M.C.C.; Peres, Maria de Fátima; Anjos, O.Grape composition during ripening, in two cultivars and different sites of "Beira Interior" region
- Inovação tecnológica na produção de aguardente de mel envelhecida com madeira de acáciaPublication . Antunes, Carlos Alberto Lopes; Anjos, Ofélia Maria Serralha dos; Caldeira, Ilda Maria Justino; Pedro, Soraia InêsO envelhecimento de aguardentes com madeira é um processo tecnológico valorizador da qualidade final de bebidas. Nesta fase a aguardente adquire novos aromas, melhora as suas características sensoriais e adquire cor característica, que é valorizada pelo consumidor. A aguardente de mel é um produto resultante da atividade apícola obtido pela fermentação e destilação do mel e com características aromáticas diferenciadoras. Este trabalho teve como objetivo avaliar a potencialidade de um novo destilado à base de aguardente de mel envelhecida com madeira de Acácia. O ensaio teve uma duração de três meses e foi realizado à escala laboratorial usando, no envelhecimento, madeiras, com queima média, de cinco espécies diferentes de Acácia. Para caracterizar este produto foi determinada a massa volúmica, título alcoométrico volúmico, extrato seco, acidez total, volátil e fixa, pH, características cromáticas, análise de voláteis por GC-FID e GC-MS, espetroscopia vibracional (NIR e FT-RAMAN) e análise sensorial com painel treinado. Os resultados das análises físico-químicas mostraram que o teor alcoólico se manteve constante durante o envelhecimento, a heterogeneidade das madeiras refletiu-se nas diferenças significativas encontradas no teor de extrato seco e nas características cromáticas. O envelhecimento proporcionou para todas as modalidades um aumento da acidez total e consequente aumento de pH. Verificou-se a presença de compostos voláteis minoritários (furfural, ácido decanoico, 2-feniletanol e vanilina) assim como um teor nulo de metanol nas aguardentes. Na análise sensorial, os resultados sugerem a possibilidade de diferenciação organolética das aguardentes, em função da espécie de madeira usada no envelhecimento sendo a amostra de aguardente de mel envelhecida com madeira de carvalho-francês e a amostra de aguardente de mel envelhecida com madeira de Acacia melanoxylon as mais apreciadas.
- Quality of bee pollen submitted to drying, pasteurization, and high-pressure processing – A comparative approachPublication . Anjos, O.; Seixas, Natália; Antunes, Carlos Alberto Lopes; Campos, Maria da Graça; Paula, Vanessa Branco; Estevinho, Letícia M.Bee Pollen is a valuable and useful natural food product that can be used for different purposes, among which medical ones. This matrix is deemed a superfood because of its chemical composition, which is rich in nutrients and possesses significant bioactivities, including antioxidant and microbiological properties. Nevertheless, the storage conditions and processing methods must be optimized to maintain their properties and maximise their application. This work investigates the best bee pollen conservation process and its impact on individual constituents. Monofloral bee pollen was analysed for 30 and 60 days after three different storage processes (drying, pasteurization, and high-pressure pasteurization). The results showed a decrease mainly in fatty acid and amino acid content for the dried samples. The best results were obtained with high-pressure pasteurization, maintaining the proteins, amino acids and lipids characteristics of pollen and the lowest microbial contamination.
- Use of acacia pods as a source of vegetal organic matter for soilPublication . Pedro, Soraia; Antunes, Carlos Alberto Lopes; Pitacas, F.I.; Monteiro, M.C.H.; Gominho, Jorge; Gallardo, Eugenia; Anjos, O.Incorporating vegetal organic matter into the soil releases nutrients and increases its contents in organic matter, which can provide higher soil productivity and lower susceptibility to compaction. Acacia is an invasive plant in Portugal, and the huge seed bank incorporated into the soil every year is problematic for their dissemination. Suppose the green pods can have a sustainable use contributing to soil fertility. In that case, it will be possible to reduce this seed bank and contribute to delaying the proliferation of this species. In this work, the value, and mineral elements contents of Acacia pycnantha, A. retinodes and A. longifolia green pods were evaluated concerning their potential use as soil fertilizers.