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- Responsive dehydration: sensor-driven optimisation of production cycles in a solar dehydratorPublication . Rossi da Silva, Paulo Bruno; Farrero, Bernardo; Silva, Arthur Marangoanha; Babo, Pedro S.; Ribeiro, Luís FrölénDrying is an effective method for preserving food. Compared to freezing, it consumes less energy and produces equivalent results. Solar heat is a great way for small farmers to create sustainable and affordable goods since it costs no energy. This article describes and explains how to operate equipment developed to address this issue. The equipment is currently undergoing experimental validation, and real-time monitoring and user notification systems have been installed to improve the production experience and the post-harvest conservation of food products. Additionally, the installed tracking system allows farmers to keep track of their products from the farm to the factory. This article demonstrates how integrated monitoring and tracking systems can enhance small farmer production by optimizing the drying process of acorns.
- Exploring acorn shells: Phenolic composition and bioactive potential for sustainable valorizationPublication . Mateus, Cristiano; Alonso-Esteban, José Ignacio; Finimundy, Tiane C.; Mandim, Filipa; Oliveira, Izamara; Babo, Pedro; Ferreira, Isabel C.F.R.; Barros, LillianPedunculate (Quercus robur L.), holm (Quercus rotundifolia Lam.), and cork (Quercus suber L.) oaks are abundant across the Portuguese landscape. This study aims to evaluate the phenolic composition and bioactivities of acorn shell samples and determine their potential as a functional compound source. In total, five acorn shell samples collected in different locations and from different species were analyzed: Q. rotundifolia (Q. rot-1 and Q. rot-2), Q. suber (Q. sub-1 and Q. sub-2) and Q. robur (Q. rob-1). A total of nine phenolic compounds were tentatively identified, namely gallic and ellagic acids and derivatives. Digalloyl hexoside was the compound detected in higher concentrations in all extracts (2.093 – 8.3 mg/g extract). Q. suber samples exhibited the lowest IC50 values for TBARS assay, lower than the positive control used (Trolox). Overall, the studied samples demonstrated the capacity to inhibit the proliferation of all tumor cell lines tested. Sample Q. sub-1 demonstrated the most promising antibacterial capacity. According to the results, the acorn shell extracts exhibited promising potential, and it may be interesting to conduct a deeper study on the samples of this species.