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FCT2-Artigos (em revistas ou actas indexadas)

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http://hdl.handle.net/10400.1/198
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Percorrer FCT2-Artigos (em revistas ou actas indexadas) por Objetivos de Desenvolvimento Sustentável (ODS) "02:Erradicar a Fome"

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  • Antimicrobial and antioxidant activities of natural compounds: enhance the safety and quality of food
    Publication . Faleiro, Maria Leonor; Miguel, Maria da Graça
    Nature has offered us a tremendous diversity of natural compounds, for which antimicrobial and antioxidant properties have been intensively explored and nowadays are plenty recognized. During the last decades both the antimicrobial action of natural compounds (preventing and limiting microbial growth) and their antioxidant properties (reducing the oxidation of fats and limiting the ripening and browning of fruit and vegetables after harvesting) have been intensively investigated, particularly in the food packaging sector, evidencing that they may represent an effective eco-friendly approach to enhance the safety and quality of food products, without an environmentally deleterious impact.
    2020-08-20Editorial de revista Acesso aberto Ver mais
  • Competitiveness of portuguese montado ewe production systems among the european ewe production systems
    Publication . Ferreira da Silva da Costa Freitas, Maria de Belém; Ventura-Lucas, Maria Raquel; Izquierdo, Lola; Deblitz, Claus
    The number of ewes in Portugal registers a decrease since 1998. This decrease is felt particularly in the south of the country, which concentrates almost half of the existing ewes, mainly for meat production. One of the most important ewe production systems is the Montado, a High Nature Value ecosystem, occupying ca. 1.2 million ha in Portugal. The competitiveness of this system among the European ewe production systems is an important issue for the future of the Montado ecosystem. So, the objective of this paper is to analyze the ewe production systems in the Montado, using the agri benchmark database, and compare these systems with other European countries’ systems, ranking their competitiveness and e_ciency among other systems in the European Union. We concluded that this methodology facilitated an in-depth understanding not only of the competitiveness and e_ciency of ewe production systems in Portugal but also of their positioning regarding other systems in the European Union. The pattern of returns assures that these farms are competitive in the sense that they depend on the market on their decisions, and thus it is important that market values sheep products. Nevertheless, the diversification to other income sources would be a good option for the future sustainability of these farms and the opportunities and risks that these systems will deal with in a new green economy, with probable new functions and new opportunities for land, will be a challenge for the future.
    2020-05-22Artigo científico Acesso aberto Ver mais
  • Edible coatings enhance storability and preserve quality of kiwiberry (Actinidia arguta L.) cv. Ken’s Red
    Publication . Guerreiro, Adriana; Gago, Custódia; Passos, Dário; Martins, Jaime; Cruz, Sandra P.; Guerra, Rui; Veloso, Fernão; Antunes, Maria Dulce
    Kiwiberries, an emerging fruit variety with increasing consumer demand, face significant commercialization challenges due to their short shelf life. This study evaluates the effectiveness of edible alginate-based coatings in extending the shelf life of kiwiberries. Two emulsion types—coarse (Coarse) and nanoemulsions (Nano)—and two application methods—spraying (Spray) and dipping (Dip)—were tested. Additionally, the use of visible/near-infrared (Vis-NIR) spectroscopy for non-destructive quality monitoring was explored. Coatings were prepared with 2% (w/v) alginate (SAlg) enriched with eugenol (Eg) and citral (Ct) at their minimum inhibitory concentrations (MICs) of 0.10% and 0.15%, respectively, as well as at double these concentrations. This resulted in a total of ten different treatments. The fruits were stored at approximately 5 ◦C, with evaluations conducted after 5 days, 2 weeks, and 4 weeks. Quality parameters, including color, firmness, soluble solid content (SSC), dry matter, weight loss, decay, total phenolic content (TPC), flavonoids, DPPH, FRAP, and malondialdehyde (MDA) levels, were analyzed. Over the storage period, color and SSC increased, while firmness decreased. Weight loss and MDA levels showed the most significant changes, particularly in treatments with higher essential oil concentrations. Notably, treatments such as SAlg Spray, SAlg Dip, SAlg Ct 0.15 + Eg 0.1 Nano Spray, SAlg Ct 0.15 + Eg 0.1 Nano Dip, and SAlg Ct 0.15 + Eg 0.1 Coarse Dip demonstrated superior preservation of kiwiberry quality. Moreover, Vis-NIR spectroscopy proved valuable for distinguishing between coating treatments, highlighting its potential for non-destructive quality assessment.
    2025-01-19Artigo científico Acesso aberto Ver mais
  • Efficacy of slow sand filtration enriched with trichoderma atroviride in the control of fusarium oxysporum in soilless cultivation systems
    Publication . Matias, Pedro; Guerreiro David Coelho, Luísa Isabel; Reis, Mário
    On a planet intending to move toward carbon neutrality while ensuring food security, maximizing water and nutrient use efficiency in agriculture is essential. Soilless cultivation offers a promising solution for food production, yet in substrate-based systems, excess nutrient solution (drainage) is often discarded to maintain phytosanitary safety, resulting in considerable water and nutrient waste. Reusing this drainage requires disinfection to eliminate pathogens. Among available methods, slow sand filtration (SSF) is ecological, economical, and simple, showing strong biological control potential, though not always fully effective against Fusarium oxysporum. Trichoderma atroviride, an antagonistic fungus, may enhance SSF performance. Its antagonistic capacity was evaluated in vitro via direct confrontation assays and in vivo using a closed-loop soilless cucumber cultivation system with eight treatment combinations of SSF, T. atroviride, and F. oxysporum. SSF reduced F. oxysporum incidence by approximately 48%, T. atroviride in irrigation by 44%, and SSF enriched with T. atroviride reached 58% disease incidence reduction, though this increase was not statistically significant. These results confirm that both SSF and T. atroviride can partially suppress F. oxysporum, but further optimization is needed for consistent and complete pathogen control.
    2026-01-14Artigo científico Acesso aberto Ver mais
  • Embedding a real-time strawberry detection model into a pesticide-spraying mobile robot for greenhouse operation
    Publication . Amraoui, Khalid El; Ansari, Mohamed El; Lghoul, Mouataz; Alaoui, Mustapha El; Abanay, Abdelkrim; Jabri, Bouazza; Masmoudi, Lhoussaine; LUÍS VALENTE DE OLIVEIRA, JOSÉ
    Abstract: The real-time detection of fruits and plants is a crucial aspect of digital agriculture, enhancing farming efficiency and productivity. This study addresses the challenge of embedding a real-time strawberry detection system in a small mobile robot operating within a greenhouse environment. The embedded system is based on the YOLO architecture running in a single GPU card, with the Open Neural Network Exchange (ONNX) representation being employed to accelerate the detection process. The experiments conducted in this study demonstrate that the proposed model achieves a mean average precision (mAP) of over 97%, processing eight frames per second for 512 × 512 pixel images. These results affirm the utility of the proposed approach in detecting strawberry plants in order to optimize the spraying process and avoid inflicting any harm on the plants. The goal of this research is to highlight the potential of integrating advanced detection algorithms into small-scale robotics, providing a viable solution for enhancing precision agriculture practices.
    2024-08-15Artigo científico Acesso aberto Ver mais
  • From Lignocellulosic residues to protein sources: insights into biomass pre-treatments and conversion
    Publication . Vera dos Anjos, Isabela; Coelho, Natacha; Duarte, Hugo; Proença, Diogo Neves; Duarte, Maria F.; Jorge de Barros, Raúl José; Raposo, Sara; Gonçalves, Sandra; Romano, Anabela; Medronho, Bruno
    With the global population steadily rising, the demand for sustainable protein sources has become increasingly urgent. Traditional animal- and plant-based proteins face challenges related to scalability, resource efficiency, and environmental impact. In this context, single-cell protein has emerged as a promising alternative. Derived from microorganisms such as algae, bacteria, fungi, and yeast, single-cell protein offers a high nutritional profileincluding all essential amino acids and vitamins—while enabling rapid production, minimal land and water requirements, and no generation of greenhouse gas emissions. A particularly compelling advantage of single-cell protein is its ability to be produced from agro-industrial waste, converting low-cost residues into valuable nutritional resources and contributing to environmental sustainability. Among these waste streams, lignocellulosic biomass from agricultural and forestry residues stands out as a renewable, biodegradable, and abundant feedstock. This review explores the potential of lignocellulosic waste as a substrate for single-cell protein production, emphasizing both its environmental advantages and nutritional value. It highlights the single-cell protein role as a sustainable and scalable alternative to conventional protein sources. The review also identifies key scientific, economic, and regulatory challenges, and recognizes the importance of targeted investments, particularly in policy development, public awareness, and technological innovation, to enable the broader adoption and acceptance of single-cell protein -based products.
    2025-08-20Artigo científico Acesso aberto Ver mais
  • Land-use evolution and trends in portugal: an approach based on the standard output
    Publication . Xavier, António; Rosário, Maria do Socorro; Fragoso, Rui; Carvalho. Maria Leonor da Silva; Ferreira da Silva da Costa Freitas, Maria de Belém
    Since Portugal acceded to the European Union, the measures introduced under the Common Agricultural Policy (CAP) have significantly influenced farmers’ behavior and their choices of agricultural activities, with different consequences on agricultural sustainability. This paper analyses changes in crop-based income following the CAP evolution in Portuguese agriculture from 1989 until 2023 and their consequences on agricultural sustainability. The analysis is based on the Standard Output (SO) for temporary and permanent crops. These data were sourced from the Agricultural Census, conducted every ten years, and the Farm Structure Surveys were held every three years. To examine the evolution of land use and establish relationships between variables, the study employed HJ-Biplot methodology and cluster analysis. Then, a comparative analysis with agricultural sustainability trends, using several social and environmental indicators, was carried out. Regarding temporary crops, the results reveal a decline in the total SO weight of cereals for grain, alongside an increase in vegetables and floriculture. For permanent crops, a decrease was observed in fresh fruits and citrus fruits, while nuts and subtropical fruits showed notable growth. Also, the positive evolution of several SOs was accompanied by improvements in agricultural sustainability on environmental and social indicators.
    2026-01-13Artigo científico Acesso aberto Ver mais
  • Molecular mechanisms of lignans in lowering blood pressure and anti-obesity effects: a review
    Publication . Das, Gitishree; Gonçalves, Sandra; Heredia, José Basilio; Leyva-López, Nayely; Romano, Anabela; Paramithiotis, Spiros; Shin, Han-Seung; Patra, Jayanta Kumar
    Lignans are naturally occurring compounds found in a wide variety of plant species, including flaxseed, soybean, pumpkin seed, broccoli, sesame seed, and some berries. Lignans have been used for centuries in both food and traditional herbal medicine. Recently, numerous new lignans and lignan derivatives with diverse biological properties have been identified. Lignans are considered promising for human health due to their hydrogendonating antioxidant activity together with their ability to complex divalent transition metal cations. They have demonstrated beneficial effects for cardiovascular disease, as well as in maintaining blood glucose levels, supporting cardiac health, promoting anti-obesity effects, decreasing the risk of renal diseases, enhancing brain function, improving skin and gut health, among others. This review explores the biosynthesis and biological effects of lignans, with a particular focus on their antihypertensive and anti-obesity properties, as well as the molecular mechanisms involved. It also highlights recent advances in sustainable lignan extraction techniques that are suitable for human use. The mechanisms underlying these bioactivities are thought to involve hormonal metabolism and availability, antioxidant action, modulation of angiogenesis, and more. However, further research is needed to fully elucidate the molecular pathways through which lignans exert their therapeutic effects. Overall, lignans from various plant sources hold significant potential for application in functional foods, dietary supplements, and pharmaceutical products aimed at preventing and managing a range of health conditions, including hypertension and obesity.
    2026-01-16Artigo científico Acesso aberto Ver mais
  • New TiO2-Ag/BEA composites with dual Ag-functionalization for specific adsorption and catalytic sites. Synergism between phases in the ethylene removal for climateric fruit conservation
    Publication . Ferreira, Ricardo; Regadera-Macías, Ana; Morales-Torres, Sergio; Pastrana-Martínez, Luisa M.; Lourenço, João P.; Silva, João M.; João, Isabel M.
    A new series of TiO2-Ag/BEA composites was specifically designed for use in filter/photo-reactors intercalated in air recirculation circuits in storage facilities for climacteric fruits. The sol-gel procedure for TiO2 deposition was combined with ionic exchange (IE) or incipient wet impregnation (IWI) techniques for Ag doping, with the proportions of both fractions also varying. The prepared materials were thoroughly characterized in terms of their porous texture, chemical composition, crystalline structure, and Ag dispersion, among other properties. Dynamic ethylene adsorption was recorded in the dark. After saturation, ethylene photooxidation was analyzed under UV or UVA-visible light, with varying contact times, flow rates, and concentrations, and with or without humidity present. The maximum ethylene adsorption capacity (361 μmol g− 1 ) corresponds to the sample with the highest Ag content (5 wt%), added by IE, while the best photocatalytic performance is obtained for samples doped by IWI. The performance of the samples was found to be correlated with their physicochemical properties and was specifically determined by the nature and dispersion of the silver species in the composites. Total ethylene photooxidation is achieved even under UV–Vis radiation; the reaction develops selectively to CO2 in all cases, despite the strong negative effect of humidity on the formation of more active HO• radicals. The high adsorption capacity and effective photooxidation of ethylene enable control of this maturation hormone below the established limits.
    2026-02Artigo científico Acesso aberto Ver mais
  • The pea (Pisum sativum L.) rogue paramutation is accompanied by alterations in the methylation pattern of specific genomic sequences
    Publication . Santo, Tatiana; Pereira, Ricardo; Leitão, José
    The spontaneous emergence among common pea (Pisum sativum L.) cultivars of off-type rogue plants exhibiting leaves with narrower and pointed leaflets and stipules and the non-Mendelian inheritance of this new phenotype were first described in the early 20th century. However, so far, no studies at the molecular level of this first identified case of paramutation have been carried out. In this study, we show for the first time that the pea rogue paramutation is accompanied by alterations in the methylation status of specific genomic sequences. Although, no significant differences were observed in the genome-wide DNA methylation in leaves of non-rogue cv. Onward in comparison to its rogue paramutant line JI2723, 22 DNA sequences were identified by methylation-sensitive amplified fragment length polymorphisms (MS-AFLP) analysis as differentially methylated in the two epigenomes. Mitotically inherited through all leaf tissues, the differential methylation patterns were also found to be meiotically inherited and conserved in pollen grains for 12 out of the 22 sequences. Fourteen of the sequences were successfully amplified in cDNA but none of them exhibited significant differential expression in the two contrasting epigenotypes. The further exploitation of the present research results on the way towards the elucidation of the molecular mechanisms behind this interesting epigenetic phenomenon is discussed.
    2017-05-18Artigo científico Acesso aberto Ver mais