Percorrer por autor "Barreiro, Filomena"
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- 14th International Chemical and Biological Engineering Conference (CHEMPOR-2023): Book of AbstractsPublication . Queiroz, Ana; Peres, António M.; Ribeiro, António E.; Barreiro, Filomena; Ferreira, Olga; Brito, Paulo; Pinho, SimãoWelcome to the 14th edition of the International Chemical and Biological Engineering Conference (ChemPor-2023) held at Bragança Polytechnic University (Instituto Politécnico de Bragança, IPB), Portugal, from 12 to 15 of September, 2023. This triennial conference, organized by a Portuguese Higher Education Institution and the Portuguese Engineers Association (Ordem dos Engenheiros), gathers experts from the chemical and biological engineering areas and related subjects to exchange knowledge and technological experiences within the academic, industrial, scientific, and technological communities. ChemPor-2023 addresses these research fields in different topics, from green chemistry to engineering education, always envisaging a sustainable development. The etymology of the word “conference”, from the Medieval Latin, means literally “bring together”. This 14th edition comes with a two-year delay following the global sanitary crisis since only a full inperson meeting could fulfill this purpose. ChemPor-2023 encompasses a gathering in a vivid, enlightening, and convivial way, and this hiatus did not limit this spirit or its objectives. The conference aims to celebrate creativity, diversity, and friendship among participants, promoting ideas exchange and fruitful interactions. We have circa 300 delegates from 4 continents, and your active participation is highly acknowledged. The general relevance of ChemPor-2023 is addressed in a variety of settings, including biorefinery, biotechnology, energy and environment, innovative materials, creation and design of novel reaction and separation processes, always foreseeing industrial applications for a sustainable shaping of the future. This edition includes an opening lecture by Jorge Calado in the immense but much less explored area of ArtScience, and an Honor Session dedicated to Alírio Rodrigues for his academic and scientific contributions, particularly regarding IPB. Besides, the conference includes 11 invited lectures from internationally recognized scientists and experts from the industry, 107 oral presentations distributed in 27 sessions, and 135 posters in two dedicated sessions. A session exclusively dedicated to companies and another for Ph.D. studies in industrial environments are to be highlighted. The “Professor Almiro e Castro” award, established in 2014 by PARALAB – Equipamentos Industrial and Laboratory SA, to recognize the scientific merit of a Portuguese professor or researcher in the last three years in the fields of Chemical and Biological Engineering, and related areas, will be announced at the closing of the conference. In that ceremony, the two best posters and the best oral communication awards by young scientists will also be granted. We want to reinforce our deepest appreciation to all the participants, but also to the members of the Honor, Scientific, and Local Organizing Committees for their invaluable contribution to the conference and acknowledge the institutional support of Instituto Politécnico de Bragança, Ordem dos Engenheiros, Centro de Investigação de Montanha, Sociedade Portuguesa de Química, and Câmara Municipal de Bragança. Expressing enormous gratitude is mandatory to all our Sponsors and associated scientific journals and publishers. Nothing could have been possible without all of you! Finally, our best wishes for success for the next ChemPor organization.
- Advancing Pickering emulsions with natural-based solid dispersion particles: Particle screening and design of pectin-based emulsionsPublication . Rezende, Stephany; Santamaria-Echart, Arantzazu; Ribeiro, Andreia; Dias, Madalena M.; Barreiro, FilomenaGiven the evolving trends in consumption, Pickering emulsions are emerging as a promising solution for functional and healthier foods, highlighting the need to diversify particle stabilisers. This study assessed the potential of curcumin-based solid dispersions (SDs) prepared with natural polymers (pectin, maltodextrin, Arabic gum, potato starch, and k-carrageenan) as Pickering stabilisers. Among these, pectin-curcumin SDs (contact angle = 48.0 ± 3.6◦) demonstrated effective emulsion stabilisation, as confirmed by confocal microscopy. The impact of oil volume fraction (φ = 0.20–0.70) and SD concentration (1.0–5.0 % wt.) on emulsion stability was evaluated. An intermediate φ (0.45) consistently minimised creaming index (CI = 0–16.67 %) and droplet size (D[4,3] =2.53–4.12 μm). Complete reduction of creaming (CI = 0 %) was achieved at high SD concentration with low φ or low SD concentration with high φ, leading to improved stability. The three produced optimised formulations exhibited distinct colour properties (L* = 64.06–72.00, a* = 11.09–12.50, b* = 55.10–60.70), with hues ranging from yellow to orange, highlighting their potential for natural colouring applications. Rheological behaviour varied from gel-like (G’ > G”) to viscoelastic (G’ = G”), broadening their potential in food formulations. Higher SD concentrations with lower/intermediate φ produced structured, gel-like emulsions suitable for sauces or spreads. In contrast, lower SD concentrations with higher φ yielded fluid emulsions for dressings or beverages. These findings highlight the feasibility of SD-based Pickering emulsions for designing stable (≥30 days), visually appealing, and texturally versatile food products.
- Bacterial cellulose biosynthesis in the presence of raw moist olive pomace: A green sustainable approach that enhances biopolymer production and propertiesPublication . Crugeira, Pedro; Khelifa, Halima; Barreira, Luísa; Halla, Noureddine; Barreiro, Filomena; Rodrigues, Paula; Peres, António M.; Schreiner, Tatiana B.; Schreiner, Tatiana B.In this study, the biosynthesis of bacterial cellulose (BC) by Komagataeibacter intermedius strain isolated from Kombucha tea in the presence of raw moist olive pomace (MOP) (concentration up to 40 % in the fermentation media) was studied. The BC membranes were characterized by their antioxidant activity, structural character- istics, crystallinity, thermal stability, and mechanical behavior. Using raw MOP activated the inherent activity of the phenolic compounds, leading to cellular adaptation under unfavorable conditions and increased BC pro- duction for all tested MOP concentrations (p < 0.0001). This led to a 166.61 % increase for the 20 % MOP group compared to the control (HS medium). For this sample, enhanced antioxidant activity (~40-fold higher than the control) was found, which might be associated with the molecular interactions established between hydroxyls of BC and phenolic compounds. Moreover, an increase of 603.03 % in strain capacity, and a 376.01 % improvement in stress at break compared to the control was observed. The study confirmed that BC can be synthesized using MOP in its natural state, supporting a sustainable circular economy while enhancing the biosynthesis of a value- added product. By reducing synthetic media and utilizing MOP, a greener bioprocess can be achieved, and BC’s applicability can be expanded.
- Bioactive properties of different extracts obtained from the aerial parts of blueberry and raspberry raw materialsPublication . Plasencia, Paula; Heleno, S.A.; Pinela, J.; Pires, Tânia; Alves, Maria José; Barreiro, Filomena; Ferreira, Isabel C.F.R.; Barros, LillianThe waste biomass derived from Berry crops is a new focus of study since producers are becoming increasingly interested in its valorisation, namely to obtain high added-value products. In this context, the leaves, and other aerial parts of this raw material, are examples of waste biomass that can be exploited for several applications, namely in cosmetic formulations due to their unique chemical composition and associated bioactive properties [1,2]. In this context, this work was focused on upgrading the commercial potential of blueberry and raspberry plant by-products, which are typically discarded, presenting no economic value. Different extracts of Vaccinium myrtillus L. (blueberry) and Rubus idaeus L. (raspberry) aerial parts were obtained using green methodologies after being air-dried, grounded at 20 mesh, and protected from light. Different extraction techniques were applied, such as infusion, decoction, maceration, and ultrasoundassisted extraction (UAE), being the latter two extractions performed with EtOH:H2O (80:20 v/v) as the extraction medium. The obtained extracts were studied regarding their antioxidant and antimicrobial properties through the oxidative haemolysis inhibition assay (OxHLIA) and the microdilution method against pathogenic bacteria, respectively.
- Chemical and bioactive characterization of blueberry bioresiduesPublication . Plasência, Paula; Heleno, S.A.; Garcia, Pablo; Barreiro, Filomena; Ferreira, Isabel C.F.R.; Barros, LillianBlueberry production has increased exponentially in recent decades due to its known high nutritional characteristics, and bioresidues originating from its culture have also increased. It is critical to limit its buildup. One strategy for directing these residues is to turn them into high-value products while investigating their potential bioactivity. The goal of this study was to produce bioactive extracts from blueberry aerial parts using environmentally friendly methods. Different extracts, such as infusion, maceration, and decoction, were considered, as well as emerging extraction technologies, such as ultrasound-assisted extraction, in which different conditions (potency, temperature, and solvent type) were tested to achieve optimal extraction conditions (high yields and purity). The obtained extracts were studied regarding their chemical profile through phenolic compound´s identification and quantification by HPLC-DAD-MS.
- Chestnut burrs as a sustainable source of cellulose for Pickering emulsion stabilisersPublication . Lains, Joana; Almeida, Heloísa H.S.; Barreiro, Filomena; Silva, Cláudia Gomes; Dias, Madalena M.; Santos, Ricardo J.; Ribeiro, Andreia; Martins, Isabel M.As the global population grows, increasing food consumption drives a significant rise in agri-food waste. In the northern Tras-os-Montes region of Portugal, one of the world's largest chestnut producers, this waste includes valuable by-products such as chestnut burrs, which are composed of 63% cellulose. This study aims to valorise chestnut burrs by extracting compounds for incorporation into high-added-value products. Cellulose was extracted through physical and chemical pre-treatments, alkali hydrolysis and bleaching. The process parameters were adjusted to enhance the extracted cellulose content and purity. Extracts were characterised by thermogravimetry and Fourier Transform Infrared Spectroscopy, and parameters such as particle size, zeta potential and wettability were also assessed and compared with commercial microcrystalline cellulose. Temperature was identified as the key parameter in alkali hydrolysis, with optimal conditions obtained for 10% NaOH at 100 degrees C for 1 h and a biomass-to-solvent ratio of 1:20 g/mL. Bleaching under optimal conditions (2% NaClO at 35 degrees C) removed an additional 7% lignin and enhanced the whiteness of the final product. The cellulose obtained has a purity of 72%, with a particle size of 55 mu m, a negative surface charge, hydrophilic behaviour, an estimated molecular weight of 13.2 kDa, and a crystallinity of 56.5%. When applied at 0.8 wt% of the aqueous phase in 20:80 oil-in-water emulsions, these particles stabilise Pickering emulsions with a 12 mm average droplet size, remaining stable for at least 30 days. These findings demonstrate that chestnut burrs are a viable and sustainable source of cellulose with high potential as a natural Pickering emulsion stabiliser for use in food, cosmetics, and pharmaceuticals.
- Chitosan-xanthan gum-based hydrogels loaded with essential oil distillation by-products of Aloysia citrodora Paláu for antimicrobial systemsPublication . Almeida, Heloísa H.S.; Santamaria-Echart, Arantzazu; Amaral, Joana S.; Aquino, Leandro Lima ; Rodrigues, Alírio; Barreiro, FilomenaHydrogels, 3D hydrophilic networks formed by oppositely charged biopolymers like chitosan and xanthan gum, offer a safe, non-toxic, and biocompatible option for delivery applications. Essential oil (EO) by-products, such as hydrosols and wastewater, are sources of antioxidant and antimicrobial compounds, but their high dilution can limit direct applications. In this context, this work focused on the development of hydrogels via electrostatic complexation incorporating hydrosol and wastewater by-products from the steam distillation of Aloysia citrodora Palau, using a two-stage approach: (a) initial loading during hydrogel formation and (b) subsequent reloading of the hydrogels to further enhance the concentration of bioactive compounds. The effect of pH (4, 7, and 11) on polymer complexation was evaluated, as it influences polymer-polymer and polymer-bioactive compound interactions by modifying the protonation and deprotonation states of their functional groups. This effect was evident in swelling, release kinetics, morphology, and rheological properties. Fourier-transform infrared (FTIR) analysis confirmed the successful formation of the polymer complex. Neutral pH hydrogels showed the highest hydrosol entrapment (70.3%) and were selected as the most promising systems. Biological characterisation showed that the reloading process enhanced bioactivity. Wastewater-load-reload improved antioxidant capacity, driven by the high phenolic content. Moreover, hydrosol-loaded-reload systems exhibited antimicrobial activity, with bactericidal effects against Staphylococcus aureus and Escherichia coli, outperforming both unloaded and loaded systems. These findings highlight the potential of loading and reloading steps to valorise EO by-products, producing sustainable, functional hydrogels with high bioactivity, suitable for food, pharmaceutical, medical, and biotechnological applications.
- Circular Valorisation of Essential Oil Post-distillation by-products for Enhanced Xanthan Gum Bioproduction and Antimicrobial Treatments against Staphylococcus aureusPublication . Almeida, Heloísa H.S.; Crugeira, Pedro; Santamaria-Echart, Arantzazu; Amaral, Joana S.; Finimundy, Tiane C.; Barros, Lillian; Rodrigues, Alírio; Barreiro, FilomenaEssential oil (EO) post-distillation by-products, like hydrosols and wastewater, are sources of bioactive compounds. Aligned with the principles of the circular economy, these residues offer a cost-effective alternative for various applications. In this context, this study investigated xanthan gum (XG) biosynthesis by Xanthomonas campestris ATCC 33913 in a mineral salt medium supplemented with four hydrosols (Cupressus leylandii A.B. Jacks & Dallim, Eucalyptus globulus Labill., Aloysia citrodora Pal & aacute;u, and Melissa officinalis L.), achieving a 15.8% increase in production (13.91 g/L) when 10% C. leylandii hydrosol was used, compared to the control (12.01 g/L). The combination of this XG sample with a 50:50 (v/v) A. citrodora hydrosol and wastewater mixture yielded a product with a strong antioxidant capacity (90.2% free radical scavenging) and bacteriostatic effects against Staphylococcus aureus. Moreover, its antimicrobial capacity increased over time, likely due to the bacteria's extended exposure to the bioactive compounds found in both by-products. These interactions may compromise the integrity of the cell membrane, thereby enhancing compounds' penetration, reducing S. aureus by 48.3% in clean conditions (low organic load) and 40.6% in dirty conditions (high organic load) after 45 min, both of which were significantly different from the control (p < 0.0001). The developed product demonstrated antimicrobial activity against S. aureus biofilms, reducing them by 35.9% (p < 0.001) after 45 min of treatment. This effect was increased (56.8%; p < 0.0001) by doubling the treatment time (90 min). Repurposing EO by-products as novel ingredients provides antioxidant and antimicrobial benefits for innovative products targeting S. aureus and its biofilms.
- Closing Editorial: New Insights into Food Ingredients for Human Health PromotionPublication . Ribeiro, Andreia; Barreiro, FilomenaIn recent years, the intersection of food science and health promotion has gained interest. Driven by consumer awareness and a global push toward healthier, safer, and more sustainable food systems, the demand for functional, fortified, and clean-label products has grown substantially. In response to these evolving expectations, this Special Issue of Applied Sciences, titled “New Insights into Food Ingredients for Human Health Promotion”, brings together research and review articles that explore the development, characterization, and application of bioactive compounds with the potential to promote human health. These contributions reflect a commitment to innovation in food ingredient science, offering solutions that are both effective and aligned with the Sustainable Development Goals.
- Colloidal lignin particles for Pickering emulsion stabilization: multifunctional properties and prospects for cosmetic applicationsPublication . Colucci, Giovana; Rodrigues, Alírio; Barreiro, FilomenaLignin, the most abundant aromatic biopolymer on Earth, is abundantly found as a by-product of biomass processing industries. Lignin presents remarkable properties, including antioxidant, UV-blocking, thermal stability, and antimicrobial; thus being considered a valuable feedstock to replace synthetic and fossil-based resources. Colloidal lignin particles (CLPs) are a promising strategy to overcome technical barriers in lignin valorization and have attracted increasing interest to be applied as multifunctional ingredients into several fields, including agriculture, biomedical, construction, and more recently, cosmetics. For this latter, CLPs stand out as promising Pickering stabilizers, creating opportunities for the development of surfactant-free cosmetic formulations. This review provides a current state of lignin research, focusing on the production of CLPs and Pickering emulsions and the key factors influencing their formation and stability. Recent progress in CLPs-stabilized Pickering emulsions is thoroughly addressed. Furthermore, it highlights advances on the multifunctional attributes of CLPs, including antioxidant activity, UV shielding, and demonstrated safety for cosmetic applications. The review concludes by discussing current challenges and future research directions for advancing the use of CLPs as sustainable materials in cosmetic science.