ESACB - Comunicações em encontros científicos e técnicos
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Percorrer ESACB - Comunicações em encontros científicos e técnicos por Domínios Científicos e Tecnológicos (FOS) "Ciências Agrárias"
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- Crataegus monogyna: espécie autóctone, de suporte ecológico e com potencial ornamental - desafios e estratégias na sua propagaçãoPublication . Delgado, F.M.G.; Moura, Margarida; Teixeira, M.C.C.; Domingues, JoanaO pilriteiro (Crataegus monogyna Jacq.) é uma espécie autóctone com reconhecido valor ecológico, ornamental e medicinal, apresentando, contudo, limitações significativas ao nível da sua propagação, tanto por via sexuada como assexuada. O presente trabalho teve como objetivo estudar e otimizar diferentes métodos de propagação da espécie, contribuindo para a sua valorização e potencial utilização ornamental.
- Dual recovery of mineral nutrients and organic compounds from swine slurry using electrodialytic processPublication . Vitória, Cláudia; Monteiro, M.C.H.; Anjos, O.; Gallardo, Eugénia; Oliveira, VerónicaThe transition towards a circular economy in agriculture critically depends on closing nutrient loops. Currently, farmers spend approximately 30% of their production costs on fertilizers alone. Traditional mineral fertilizers rely on extracting limited natural resources. This linear “take-make-dispose” model needs transformation, and animal waste streams offer a promising solution as valuable secondary nutrient sources. Recent innovations in waste valorization demonstrate how livestock byproducts can be transformed into valuable resources. The electrodialytic (ED) technology represents a breakthrough in this field, enabling the extraction of essential plant nutrients (N, P, Ca, K, Mg) from animal waste such as swine slurry to create bio-based fertilizer alternatives. This sustainable approach uses minimal electrical current combined with ion exchange membranes for selective nutrient concentration. While previous research focused primarily on mineral nutrient recovery, our study expanded the scope to examine organic compounds throughout the ED process. Using swine slurry in batch experiments, we achieved complete phosphorus recovery (100%) and substantial nitrogen recovery (57%). Importantly, we identified valuable organic compounds in the recovered solutions. This research demonstrates ED’s potential as a circular economy tool that not only recovers essential mineral nutrients but also concentrates beneficial organic compounds. The discovery of these bioactive molecules in the recovered matrix opens new possibilities for creating enhanced bio-based fertilizers, though their agricultural benefits require further field testing. This dual recovery of minerals and organic compounds represents a significant step toward more sustainable and resource-efficient agricultural practices.
- Valorization of fruit distillation pomacesPublication . Serra, Lara; Pitacas, F.I.; Pedro, Soraia; Pires, Bruno; Fernandes, Tiago; Luís, Ângelo; Gallardo, Eugenia; Anjos, O.This study aims to characterise the nutritional composition of distillation pomace from the production of spirits from apple, pear and strawberry tree fruits (STFs) and to assess its potential for valorisation within circular economy and zero waste strategies. Pomace samples were collected after distillation at a distillery in Castelo Branco. Two batches per fruit type, each with three replicates, were analysed. The following parameters were analysed: ash content, organic matter content, protein content, fat content, fibre content, lignin content, hemicellulose content, cellulose content, non-fibrous carbohydrate content, total phenolic content (TPC) and total flavonoid content (TFC). The antioxidant and antimicrobial activities were determined and the compound profiles were assessed by HPLC. FTIR-ATR spectroscopy was applied for chemical fingerprinting. ANOVA and principal component analysis (PCA) were used for data interpretation. PCA for nutritional parameters explained 96.6% of the total variance and clearly distinguishedbetween the pomaces used. Apple pomace had the highest protein content (6.04 ± 0.07 g/100 g), whereas pear pomace had the lowest (2.83 ± 0.27 g/100 g). STF pomace had the highest fat content (4.71 g/100 g) and was rich in organic matter, fibre, hemicellulose and cellulose. STF and apple pomaces additionally exhibited higher TPC and TFC values. Using HPLC-DAD, we were able to identify 28 phenolic compounds, as well differentiating between the pomaces and confirming the presence of compounds of interest. The highest concentrations were found for resveratrol and syringic acid, particularly in pear extracts (0.73–0.59 μg/mg extract). Benzoic acid, p-coumaric acid and rutin also appeared in relatively high amounts. FTIR-ATR spectroscopy identified functional groups, supporting chemical discrimination and different potential valorisation. Distillation pomace revealed valuable nutritional and chemical properties, highlighting its potential as a raw material for use in the food industry. STF pomace, in particular, is characterised by its high fibre and bioactive compound content. Further research is needed to optimise its industrial use.