Browsing by Author "Carvalho, Ana"
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- 1º relatório - vacinação para a COVID-19: intenção e seus preditores. Estudo na população portuguesa, em diferentes etapas do ciclo de vidaPublication . Godinho, Cristina Albuquerque; Francisco, Rita; Gaspar, Rui; Arriaga, Miguel Telo de; Costa, Andreia Silva da; Costa, Diana; António, João; Carvalho, Ana; Fonseca, Válter; Santos, Benvinda dos; Freitas, Graça
- 2º relatório - vacinação para a COVID-19: intenção e seus preditores. Estudo na população portuguesa, em diferentes etapas do ciclo de vidaPublication . Godinho, Cristina Albuquerque; Francisco, Rita; Gaspar, Rui; Arriaga, Miguel Telo de; Costa, Andreia Silva da; Costa, Diana; António, João; Carvalho, Ana; Fonseca, Válter; Freitas, Graça
- Bacterial diversity and probiotic activity in sole aquaculturePublication . Cunha, Sofia; Carvalho, Ana; Barros, Rui; Gomes, Ana; Manaia, C. M.
- Caracterização do teor em polifenóis e capacidade antioxidante de chocolates negro existentes no mercado PortuguêsPublication . Ribeiro, Vânia; Carvalho, Ana; Gomes, Ana
- Characterization of olive varieties from Albania: Fatty acid profile and total phenolic contentPublication . Topi, D.; Thomaj, F.; Bacu, A.; Malollari, I.; Carvalho, Ana; Gomes, Ana M. P.The research study presented in this paper, the first of its kind in Albania, characterizes the fatty acid profile and total phenolic content of some olive varieties, namely, Boçi, Ulli i Kuq, Ulli i bardhe Lezha, Sterbjak and Micka all harvested during crop year 2010-2011. Annual production capacity of the country is 56 000 tons of olive fruits and 7000 tons of olive oil. Fatty acid (FA) profiles to the studied olive cultivars exhibit a great variation in oleic acid, from 66.32 ± 0.14 % (Ulli i Kuq) to 75.13 ± 0.31 % (Sterbjak), values which are within the normal range for such FA. The content of linoleic acid varies from 7.23 ± 0.04 % (Sterbjak) to whereas the content of linolenic acid varies from 0.45 ± 0.01 % (Ulli i Kuq) to 0.96 ± 0.01 % (Sterbjak). All studied olive varieties revealed moderate levels of palmitic acid, which varied between 10.76 ± 0.05 % (Sterbjak) and 13.05 ± 0.02 % (Boçi). From a nutritional point of view, it is worth noticing that the Sterbjak variety has an n-6/n-3 ratio of 7.68, while the Ulli i bardhe Lezha goes to 10.20. The Total Phenolic Content for the studied olive cultivars varied from 63.02 ± 5.63 GA mg/kg olive oil (Ulli i kuq) to 322.05 ± 3.97 GA mg/kg olive oil Ulli i bardhe Lezha such variation reflect differentness among studied olive varieties.
- A Delphi study of business models for cycling urban mobility platformsPublication . Sá, Elisabete; Carvalho, Ana; Silva, Joaquim; Rezazadeh, ArashThe movement towards sustainable and liveable cities is gaining momentum and is projected to continue to shape the future of cities. Bicycles are one of the fastest-growing transportation modes that can contribute to more sustainable and smart urban mobility. New digital service platforms will likely arise to support an enhanced cycling mobility experience while also offering value to other stakeholders of a connected urban mobility ecosystem. Exploring suitable business models is critical to sustaining digital urban mobility platforms, but approaches that consider multiple stakeholders are scarce in previous research. Aiming to reduce this gap, this Delphi research with experienced professionals and academics adopts an ecosystem approach and explores two important components of business models for future cycling urban mobility platform services and the data they would generate: value propositions and value capture models. Results show that experts participating in the study generally agree on the potential attractiveness of the services of such a platform and mobility data for the studied stakeholders. However, lower and diverging estimates regarding the expected willingness to pay suggest that a business model that combines revenues from platform services and data services may be needed and that cross-subsidisation of some stakeholders could be necessary.
- #EntreViagenseAprendizagens: study protocol of a school-based intervention to promote well-being and healthy lifestyles among adolescentsPublication . Francisco, Rita; Raposo, Beatriz; Hormigo, Mafalda; Sesifredo, Mónica; Carvalho, Ana; Justo, Ana; Godinho, Cristina AlbuquerqueBackground: Adolescence is a critical period of development in which well-being usually decreases, mental health problems (e.g., depression, anxiety) increase, and lifestyles become less healthy. Schools are a primary setting for the promotion of the well-being and overall health of adolescents, and preventive actions should be a priority within the scope of health-promoting schools. #EntreViagenseAprendizagens is a school-based intervention aiming to promote well-being and healthy lifestyles among adolescents based on social and emotional learning, positive psychology, and health education approaches. Methods: This protocol describes a school-based intervention, #EntreViagenseAprendizagens, that will be implemented in several schools in Portugal. The program is aimed at 8th and 9th grade students (14–16 years old) and comprises 20 weekly sessions. One of the sessions is aimed at the students’ parents/guardians. The intervention content targets social and emotional skills, health literacy (physical and mental health), healthy lifestyles, character strengths, and well-being. An experimental design will be used in the intervention evaluation. Eighth grade classes will be randomly assigned to the intervention group or the control group. All students complete the same assessment protocol at baseline, post-intervention, and 9-month follow-up. The impact assessment protocol includes measures related to well-being, health literacy, health-related knowledge, attitudes and behaviors, relationships with others, social and emotional skills, and sociodemographic data. Process evaluation includes evaluation forms at the end of each session and at the end of the program and focus groups with students, parents, and teachers at the end of the program. Discussion: This school-based intervention may play an important role in promoting students’ well-being and in preventing unhealthy lifestyles and socio-emotional maladjustment, by focusing on the development of social and emotional skills and health literacy among adolescents, empowering them to face the changing future and grow up healthy. Furthermore, this project aims to provide relevant scientific findings that can contribute to the development of better health-promoting schools.
- Exploring the potential of invasive species Sargassum muticum: microwave-assisted extraction optimization and bioactivity profilingPublication . Silva, Aurora; Cassani, Lucia; Carpena, Maria; Lourenço-Lopes, Catarina; Grosso, Clara; Chamorro, Franklin; García-Pérez, Pascual; Carvalho, Ana; Domingues, Valentina F.; Barroso, M. Fátima; Simal-Gandara, Jesus; Prieto, Miguel A.Sargassum muticum (SM) poses a serious environmental issue since it is a fast-expanding invasive species occupying key areas of the European shoreline, disrupting the autochthonous algae species, and disturbing the ecosystem. This problem has concerned the general population and the scientific community. Nevertheless, as macroalgae are recognized as a source of bioactive molecules, the abundance of SM presents an opportunity as a raw material. In this work, response surface methodology (RSM) was applied as a tool for the optimization of the extraction of bioactive compounds from SM by microwave-assisted extraction (MAE). Five different parameters were used as target functions: yield, total phenolic content (TPC); and the antioxidant measurements of 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity (DPPH), 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS), and β-carotene bleaching (BC). After the optimal extraction conditions were determined (time = 14.00 min; pressure = 11.03 bar; ethanol = 33.31%), the chemical composition and bioactivity of the optimum extract was evaluated to appraise its antioxidant capability to scavenge reactive species and as a potential antibacterial, antidiabetic, antiproliferation, and neuroprotective agent. The results lead to the conclusion that MAE crude extract has bioactive properties, being especially active as an antiproliferation agent and as a nitric oxide and superoxide radical scavenger.
- Phenolic compounds content and antioxidant activity of wild strawberries (Fragaria Vesca L.)Publication . Pereira, Maria João; Amaro, Ana Luísa; Carvalho, Ana; Pintado, M. E.Strawberries are usually consumed in high quantities and can thus be a valuable source of phenolic compounds, vitamin C and other antioxidant compounds. The main phenolic compounds in strawberries are anthocyanins, responsible for the red color in strawberry flesh, combined with flavonoids, flavanols, and derivatives of hydroxycinnamic and ellagic acid (Aaby et al, 2007; Pinto et al, 2008). Wild strawberries (Fragaria Vesca L.) are usually claimed as more antioxidant and more rich in specific phenolic compounds. So the aim of this work was to characterize the phenolic compounds profile and evaluate the antioxidant capacity of wild strawberries in order to ascribe the relevant nutritional and functional properties of these strawberries. Total phenolics were assessed by Folin Ciocalteau's method, total anthocyanins by spectrophotometric methods, total antioxidant activity by the ABTS method and the phenolic compounds were analyzed by high performance liquid chromatography (HPLCDAD). The results obtained reveal that wild strawberries are indeed a great source of phenolic compounds (catechin, epigallocatechin gallate, rutin and ellagic acid) and anthocyanins (cyanidin-3-O-galactoside, cyanidin-3-O-glucoside, pelargonidin-3-O-glucoside, pelargonidin-3- O-rutinoside). All of these compounds have importance for the high antioxidant activity demonstrated by these strawberries. Thus, this study highlights the potential of these wild strawberries as a source of bioactive compounds consumed in human diet.
- Use of coffee by-products for the cultivation of Pleurotus citrinopileatus and Pleurotus salmoneo-stramineus and its impact on biological properties of extracts thereofPublication . Freitas, Ana C.; Antunes, Mariana B.; Rodrigues, Dina; Sousa, Sérgio; Amorim, Manuela; Barroso, Maria F.; Carvalho, Ana; Ferrador, Sandra M.; Gomes, Ana M.Incorporating spent coffee grounds (SCGs), a by-product from coffee brewing, in growth substrate of beneficial edible mushrooms is an approach that has to be further studied due to its potential positive outcomes: environmental impact mitigation, production costs reduction and beneficial impact on consumer health. Hence, cultivation of Pleurotus citrinopileatus and Pleurotus salmoneo-stramineus was tested using SCG which enabled maximum production yield of P. citrinopileatus which was of 25.1% (w/w). Variable antidiabetic potential was observed between aqueous and enzymatic extracts (3.8%–29% inhibition) regardless species and substrates, whereas aqueous extract of P. citrinopileatus grown in substrate without SCG stood out presenting the highest antioxidant activity and inhibition activity of angiotensin I-converting enzyme (IC50 = 123 lg mL 1). Ethanolic and aqueous extracts of both Pleurotus species grown in the presence or absence of SGC proved to be an interesting prebiotic source for growth of Bifidobacterium animalis Bo in comparison with fructooligosaccharides (FOS).