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Percorrer por autor "Alvarenga, N."

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  • Farinha de insetos na alimentação humana : uma perspetiva nutricional e sustentável
    Publication . Abreu, M.; Andrade, R.; Martins, L.L.; Ramos, C.; Costa, G.J.; Lucas, R.; Alvarenga, N.; Reis, João; Dias, Igor
    2024-07Artigo científico Acesso restrito Ver mais
  • Nutritional and microbial quality of edible insect powder from plant-based industrial by-product and fish biowaste diets
    Publication . Andrade, R.; Martins, L.L.; Mourato, M.P.; Lourenço, H.; Ramos, A.C.; Roseiro, C.; Pereira, N.; Costa, G.J.; Lucas, R.; Alvarenga, N.; Reis, J.; Neves, Ana; Oliveira, Margarida; Dias, Igor; Abreu, M.
    Edible insect powder, particularly from the cricket Acheta domesticus L., is a promising sustainable alternative to traditional livestock-derived protein. Insects provide high protein content, fibre, and essential minerals, making them suitable for food applications. This study investigates the viability of alternative diets for rearing A. domesticus. Two experimental diets were tested: RI [50% horticultural by-products (HP) + 50% commercial diet (CD)] and RII (33% HP + 33% CD + 33% fish by-products). The results demonstrated that both diets were suitable for cricket rearing. Crickets reared on diets RI and RII produced, respectively, insect powders FI and FII, which were evaluated for their nutritional, bioactive, and microbiological attributes. Both powders exhibited high protein content (≈60%), all essential amino acids, higher mineral content than traditional protein sources, and met European Union food safety standards. Diet composition influenced powder characteristics: FI showed higher antioxidant activity and saturated fat content, while FII contained more protein, ash, minerals, and monounsaturated fatty acids. These findings underscore the potential of using industrial by-products to promote a circulareconomy in insect farming and suggest pathways for further research. However, since insects can bioaccumulate toxic elements, such as Hg, from diets, caution should be taken when considering fish by-products
    2025-04Artigo científico Acesso aberto Ver mais
  • Nutritional composition of commercially sourced meat from two anatomical locations under regenerative and intensive production systems
    Publication . Antunes, I.C.; Roseiro, L.C.; Gonçalves, H.; Gonçalves, E.; Soares, A.; Alegria, C.; Alvarenga, N.; Reis, J.; Oliveira, Margarida; Dias, Igor
    Regenerative agriculture approaches in livestock production may help produce animal protein that aligns with increasingly demanding sustainability criteria. This study compared commercially sourced beef from regenerative farming systems (RFS; n = 10; Longissimus lumborum, n = 5; Splenius capitis, n = 5) and intensive systems (IS; n = 6; Longissimus lumborum, n = 3; Splenius capitis, n = 3), evaluating the effects of production system (PS), muscle type (MT), and their interaction (MT × PS) on nutritional traits. IS chuck had higher polyunsaturated fatty acids (PUFA) and n-6 PUFA family (n-6 PUFA) contents (p < 0.05; 10.24 and 9.15 g fatty acids (FA)/100 g total FA, respectively), driven by C18:2 cis-9, trans-11, C20:4 n-6, and C18:2 n-6 contents. Consequently, IS chuck had a higher polyunsaturated FA and saturated FA ratio (P/S), peroxidability index (PI), n-6 PUFA family and n-3 PUFA family ratio (n-6/n-3), and hypocholesterolemic/hypercholesterolemic ratio (h/H) values (p < 0.05; 0.13, 23.87, 9.33 and 0.32, respectively). By comparison, RFS chuck had the highest n-3 PUFA content (p < 0.05; 1.28 g FA/100 g total FA), primarily due to its higher C18:3 n-3 content, resulting in a lower n-6/n-3 ratio (3.95). RFS meat showed higher vitamin E and α-tocopherol (0.58 and 0.56 mg/100 g of meat, respectively), exceeding the ≥0.30 mg/100 g threshold proposed to limit lipid oxidation, unlike IS meat.
    2026-03-07Artigo de investigação Acesso aberto Ver mais