Percorrer por autor "Maia, Margarida R. G."
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- A comprehensive review of fish protein hydrolysates targeting pet food formulationsPublication . Ribeiro, Tânia Bragança; Maia, Margarida R. G.; Fonseca, António J. M.; Marques, Bianca; Caleja, Cristina; Rosa, Ana; Martins, Rui; Almeida, André; Mota, Maria J.; Aires, Tiago; Rocha, Cristina M. R.; Teixeira, José A.; Cabrita, Ana R. J.; Barros, Lillian; Pintado, ManuelaThe fish industry generates significant amounts of fish by- and co-products (FBCPs) annually, projected to reach 160.8 million tonnes by 2030. This growth highlights the urgent need for sustainable FBCP management and an opportunity to improve the sector's environmental sustainability. Fish protein hydrolysates (FBCPHs) and bioactive peptides (BPs) derived from these FBCPs are gaining recognition in the pet food sector for their nutritional and bioactives benefits. FBCPHs, primarily sourced from category 3 by-products unsuitable for human consumption, could significantly enhance the economic viability of both industries. This review analyzes production processes, highlighting the benefits and challenges of enzymatic hydrolysis and reviewed emerging technologies such as subcritical water hydrolysis (SWH), which are promising sustainable alternatives by enhancing extraction efficiency and reducing energy consumption. The review explores FBCPHs' applications in pet food, focusing on beneficial biological activities (e.g. antioxidant, prebiotic, neuroprotective). Findings show FBCPHs have significant potential in pet food formulations, providing palatability, hypoallergenic benefits, and addressing health concerns like gastrointestinal disorders and stress-related behaviors. However, further research is required to optimize production processes, scale industrial application, and ensure regulatory compliance. In conclusion, FBCPHs present a valuable solution for promoting sustainability, improving pet nutrition, and supporting the circular economy.
- Omega-3 fatty acids from fish by-products: innovative extraction and application in food and feedPublication . Rodrigues, Matilde; Rosa, Ana; Almeida, André; Martins, Rui; Ribeiro, Tânia; Pintado, Manuela; Gonçalves, Raquel F. S.; Pinheiro, Ana C.; Fonseca, António J. M.; Maia, Margarida R. G.; Cabrita, Ana R. J.; Barros, Lillian; Caleja, CristinaOmega-3 fatty acids (O3FA) are essential nutrients that play a crucial role in maintaining human and animal health. They are known for their numerous health claims, including cardiovascular benefits, contributing to both the prevention and treatment of immunological, neurological, reproductive, and cardiovascular complications, and supporting overall well-being. Fish, especially oily fish, comprise rich source of O3FA. In the fish industry, significant amounts of by-products and waste are generated during processing which are often discarded or used for lower-value applications. However, there is recognition of the potential value of extracting O3FA from these by-products. Various extraction techniques can be used, but the goal is to efficiently extract and concentrate the O3FA while minimizing the loss of nutritional value. To prevent oxidation and maintain the stability of O3FA, natural antioxidants can be added. Antioxidants like polyphenolic compounds and plant extracts help to protect the O3FA from degradation caused by exposure to oxygen, light, and heat. By stabilizing the O3FA, the shelf life and nutritional value of the extracted product can be extended. In summary, this work presents a forward-looking strategy for transforming fish by-products into high-quality oils, which hold great potential for application in food and feed.
- Seasonal effect in nutritional quality and safety of the wild sea urchin Paracentrotus lividus harvested in the European Atlantic shoresPublication . Rocha, Filipa; Rocha, A. Cristina; Baião, Luís F.; Gadelha, Juliana; Camacho, Carolina; Carvalho, M. Luísa; Arenas, Francisco; Oliveira, Ana; Maia, Margarida R. G.; Cabrita, Ana R.; Pintado, Manuela; Nunes, M. Leonor; Almeida, C. Marisa R.; Valente, Luisa M. P.Paracentrotus lividus gonads are gastronomic delicacies widely appreciated in Europe. Two commercially exploited populations of sea urchins were characterized, for the first time, in terms of gonad quality (market-related traits such as colour, texture and nutritional value) and safety (contaminants levels) to define the best season for harvesting this valuable resource. Spawning occurred between spring-summer, yet gonad index peaked only in one population during winter. In both populations, the strongest yellow colouration and highest gonad firmness, protein, lipid, polyunsaturated fatty acids and carotenoid contents as well as the lowest contents of mineral were registered in fall. Inorganic and organic contaminants levels were, in general, similar among sites and seasons, being found at trace levels in seawater and gonads, with low risk for consumers. For these populations, high-quality gonads can be harvested during fall, despite being safe for human consumption all year round.
- The effect of sex, season and gametogenic cycle on gonad yield, biochemical composition and quality traits of Paracentrotus lividus along the North Atlantic coast of PortugalPublication . Rocha, Filipa; Baião, Luís F.; Moutinho, Sara; Reis, Bruno; Oliveira, Ana; Arenas, Francisco; Maia, Margarida R. G.; Fonseca, Antonio J. M.; Pintado, Manuela; Valente, Luisa M. P.Sea urchin population harvest in the North Atlantic coast of Portugal was characterized in terms of gonad yield, nutritional composition and important market-related traits, over one reproductive cycle (March 2016 to March 2017). Most of the quality attributes showed a seasonal variation strongly dependent on sea urchin sex. Maximum gonad yield (18%) was observed in March 2017. A single spawning event occurred between May and July. Gonads are rich sources of protein (12–18% WW) with low fat content (≤6% WW), that increase during the gametogenic stages of recovery and growing (November-December). Polyunsaturated fatty acids were the dominant class in both sexes (4.2–14.7 mg.g−1 WW), being preferentially accumulated in females. Total gonads carotenoid varied seasonally, with the highest level being observed in males during spawning season. Echinenone was the main pigment present in gonads, showing highest concentrations in males during spawning and gonad recovering. During the growing and early maturation period gonads were more reddish, yellowish and brighter, as well as more firm, irrespectively of the sex. Based on all seasonal changes affecting gonad yield and quality, the period between November and February seems the most suitable to harvest high quality gonads in the Atlantic coast of Portugal.