Search Results (82)

This study evaluated the effects of apple pomace (AP) incorporation on the physicochemical, structural, and functional properties of high-moisture meat analogs from a sustainability perspective. AP, an abundant agro-industrial by-product rich in dietary fiber and polyphenols, was upcycled at inclusion levels of 0–20%. By transforming this food waste into a value-added ingredient, the study aligns with circular bioeconomy principles to reduce environmental footprints. Increasing AP content led to reductions in textural attributes such as hardness, cohesiveness, springiness, and chewiness. Integrity index and cutting strength also declined, particularly beyond 15%, due to the disruption of the protein-starch matrix by dietary fibers. In contrast, antioxidant activities (DPPH and ABTS) improved significantly with higher AP levels, reflecting polyphenol release during extrusion. These findings highlight a trade-off between enhanced nutritional functionality and reduced structural integrity. Moderate inclusion below 10–15% may therefore offer a balance between antioxidant benefits and acceptable texture. Overall, this research demonstrates the potential of sustainable AP valorization in developing senior-friendly and plant-based meat analog products. The outcomes not only provide practical formulation guidance but also contribute to resource efficiency, waste reduction, responsible consumption, and sustainable food production systems, and the advancement of a circular bioeconomy. Full article

The valorization of agricultural by-products such as beetroot stalks (BSs) offers a sustainable strategy for reducing food waste while enhancing nutritional value of staple foods. This study investigates the incorporation of BS powder, an agricultural waste rich in phenolics, betalains, and dietary fibers, into durum wheat semolina pasta. Pasta containing 5–20% BS were evaluated for bioactive compounds, cooking performance parameters, texture, color, and sensory acceptance. Enrichment increased total phenolics, antioxidant activity, and betalain concentration in a dose-dependent manner, with 20% BS pasta reaching 2.24 mg gallic acid equivalents/g phenolics and 1.53 mg/g betalains. Although drying and boiling reduced bioactive retention, enriched pasta maintained up to eightfold higher antioxidant activity than the control. Cooking performance showed increased water uptake and swelling index at higher substitution levels, while texture analysis revealed reduced hardness and cohesiveness above 15% BS substitution. Color analysis confirmed intense red hues from betalain pigments, enhancing consumer perception. Sensory evaluation indicated that control pasta was preferred for flavor and texture, but 10–15% BS samples were well accepted for their appealing color and mild vegetal notes. Overall, BS powder demonstrates strong potential for upcycling agricultural waste into functional, sustainable pasta with enhanced nutritional quality and alignment with circular economy practices. Full article

Cantaloupe melon seeds are a byproduct that can be upcycled for their nutritional value, generating added value, reducing food waste, and supporting food sustainability. This study evaluated the effects of melon seed flour on selected physicochemical and consumer acceptance of gluten-free cookies. Melon seeds were dehydrated at 60 °C for 12 h and ground. Then gluten-free cookies containing varying melon seed flour (20, 40, 60, 80, and 100%) were prepared by mixing the ingredients and baked at 177 °C for 18 min. Color, water activity, proximate composition, and mineral contents of the melon seed flour were measured. Color, water activity, spread factor, and hardness of the five cookie formulations were evaluated. Finally, a randomized block design was used for the consumer test with 90 consumers. Appearance, aroma, flavor, texture, grittiness, and overall liking were evaluated using a 9-point hedonic scale. Also, purchase intent was asked for before and after a sustainability claim. Data were analyzed using an ANOVA and the post hoc Tukey test (p < 0.05). The McNemar test was used to test whether there were significant differences in purchase intent before and after a sustainability claim. Melon seed flour had 21.4% protein, 34.93% crude fiber, 3% ash, 4% moisture, and 26.9% fat. Spread factor and a* (color redness) values increased with increasing melon seed flour. On the other hand, the more melon seed flour in cookies, the lower the L* value and water activity. The treatment with 40% melon seed flour had the highest liking score, 6.25. Finally, the sustainability claim significantly increased the positive purchase intent of the cookies. This study demonstrates the potential of cantaloupe melon seed flour as an ingredient in food, such as gluten-free cookies. This practice in the food industry can help increase value and reduce waste in cantaloupe processing. Full article

The increasing accumulation of medical waste, especially discarded pharmaceutical blister packs, poses both environmental risks and missed opportunities for resource recovery. In this work, we demonstrate, for the first time, the direct upcycling of tablet blister waste into a potential frictional layer in triboelectric nanogenerators (TENGs). The polymer structure of blister packs, combined with Silicone rubber as a counter frictional layer, enabled the fabrication of durable TENG devices (TS-TENGs). Systematic electrical testing revealed that the TS-TENG achieved an open-circuit voltage of approximately 300 V, a short-circuit current of about 40 μA, and a peak power density of 3.54 W/m² at an optimal load resistance of 4 MΩ. The devices maintained excellent stability over 10,000 mechanical cycles, confirming their durability. Practical demonstrations included powering 240 LEDs, four LED lamps, and portable electronic devices, such as calculators and hygrometers, through capacitor charging. This study shows that not only can tablet blister waste be used as a triboelectric material but it also presents a sustainable method to reduce pharmaceutical waste while advancing self-powered systems. The approach offers a scalable and low-cost means to integrate medical waste management with renewable energy technologies. Full article

Transportation infrastructure underpins national mobility and economic growth, yet material sourcing for road construction imposes significant environmental and financial costs. As South Africa advances towards road construction, upcycling the reuse of reclaimed materials in higher-value applications offers opportunities to reduce waste and improve circular resource efficiency. This study assesses stakeholders’ perception and adoption of upcycling in the Material Utilisation Plans (MUPs) for road construction. A mixed-methods approach combined nine semi-structured interviews and thirty-two survey responses from professionals involved in the National Route 3 upgrade project. Thematic analysis identified key qualitative themes, while quantituative data from a five-point Likert scale were examined through descriptive statistics, reliability, and correlation analysis. Respondents supported existing downcycling practices (mean = 3.682, SD = 1.088) and expressed readiness to adopt upcycling for pavement surfacing, base, subbase, and subgrade (mean > 3.00, SD < 1.30). Major barriers included client specifications, limited awareness and material cost constraints. Reliability analysis (Cronbach’s α = 0.64–0.88) confirmed internal consistency across qualitative themes. Also, there was a positive correlation between reclaimed materials and cost, design specifications, and optimised cost (r > 0.30, p < 0.05), while downcycling correlated negatively with costs (r = −0.400, p < 0.05). This study provides new empirical evidence on the systemic barriers hindering upcycling adoption in South African road projects and offers a validated mixed-method framework linking perceptual, technical, and economic dimensions of material reuse. It recommends integrating upcycling criteria into design, testing, and procurement processes, shifting from compliance-based recycling to performance-based circular material management in national road infrastructure. Full article

The conventional linear life cycle of membrane materials, spanning fabrication, use, and disposal through landfilling or incineration poses serious sustainability challenges. The environmental burden associated with both the production of new membranes and the disposal of end-of-life (EoL) modules is considerable, further intensified by the reliance on fossil fuel-derived polymers, toxic solvents, and resource-intensive manufacturing processes. These challenges underscore the urgent need to integrate sustainability principles across the entire membrane life cycle, from raw material selection to reuse and regeneration. Emerging approaches such as membrane regeneration using recyclable polymers based on covalent adaptable networks (CANs) have introduced a new paradigm of closed-loop design, enabling complete depolymerization and reformation. In parallel, more conventional strategies, including the valorization of recycled plastic waste and the upcycling or downcycling of EoL membranes, offer practical routes toward a circular membrane economy. In this review, we consolidate current advances in membrane recycling, critically evaluate their practical constraints, and delineate the technical and environmental challenges that must be addressed for broader implementation. The insights presented here aim to guide the development of next-generation circular membrane technologies that harmonize sustainability with performance. Full article

Plastic-based materials dominate the packaging industry. However, their non-biodegradability has increased the need for sustainable alternatives. Biopolymers, mainly lignocellulose from agricultural residues, offer renewable, eco-friendly options in this context. This study reports the development of lignocellulosic films from alfalfa (Medicago sativa) through green valorization of its biomass. Alfalfa lignocellulosic extract (ALE) was extracted using 50% NaOH, solubilized in 68% ZnCl₂, crosslinked with CaCl₂, and plasticized with sorbitol. The concentrations of ALE, CaCl₂, and sorbitol were optimized using the Box–Behnken Design, focusing on increasing tensile strength (TS), elongation at break (EB), and reducing water vapor permeability (WVP) of the films. The optimized film formulation (0.5 g ALE, 453.8 mM CaCl₂, 1.5% sorbitol) showed a TS of 11.2 ± 0.7 MPa, EB of 5.8 ± 0.9%, and WVP of 1.2 ± 0.2 × 10⁻¹⁰ g m⁻¹ s⁻¹ Pa⁻¹. The film effectively blocked UV–Vis–IR light and exhibited notable antioxidant activity, making it suitable for packaging light-sensitive and oxidation-sensitive foods. Additionally, it achieved over 90% biodegradation within 29 days under 24% soil moisture. These findings demonstrate a sustainable approach to upcycling agricultural residues into functional products, offering a practical alternative to traditional plastics and supporting a circular bioeconomy, while adding value for alfalfa producers. Full article

This study presents the HISTOESE (History Education for Sustainable Environments) Model, an empirically grounded and practice-based framework for cultural heritage education and sustainability. Developed through a qualitative, design-based research approach, it analyzes a longitudinal corpus of 50 master’s dissertations and supervised teaching reports (2008–2025) from the Polytechnic Institute of Viana do Castelo, Portugal. Although the empirical basis derives from teacher education, the HISTOESE model fosters school–community partnerships that indirectly support cultural tourism and sustainable, place-based recovery. Using inductive thematic analysis, the study traced how project-based learning (PBL) activities mobilised local heritage, community collaboration, and sustainable pedagogical practices. Three key findings emerged: (1) local-context pedagogies strengthened children’s historical consciousness and heritage literacy; (2) inclusive, low-cost and upcycling strategies fostered community participation; and (3) partnerships with museums, tourism offices, and cultural associations generated visible cultural events that reinforced post-COVID resilience. The HISTOESE framework synthesises these insights into four interrelated pillars—Proximity and Contextualization, Inclusive and Sustainable Practices, Recognition and Valorisation and Active Citizenship and Collaboration—providing a transferable model for teacher education and community-based cultural sustainability. Practical implications concern curriculum design, heritage–tourism interfaces, and collaborative strategies for sustainable development. Full article

Hydroelectricity energy harvesting has emerged as a promising, eco-friendly alternative for addressing the growing demand for sustainable energy solutions. In this study, we present a hydroelectricity energy harvester fabricated from shredded waste printing paper (WPP), offering a novel waste-to-energy conversion strategy that requires neither material purification nor complex processing. The device leverages the randomly entangled fiber network of WPP to facilitate capillary-driven moisture diffusion and electric double layer (EDL) formation, thereby enabling efficient electrokinetic energy conversion. The random arrangement of WPP fibers increases the effective EDL area, allowing the waste printing paper generator (WPPG) to achieve an open-circuit voltage of 0.372 V and a short-circuit current of 135 μA at room temperature under optimized electrolyte conditions. This study demonstrates that carbon-black-coated WPP can be effectively upcycled into a high-performance hydroelectricity generator, exhibiting excellent electrical output at ambient conditions. By combining material recycling with efficient energy conversion, this system establishes a practical and sustainable pathway for distributed power generation. Overall, this work not only presents an environmentally responsible approach to device fabrication but also highlights that hydroelectricity energy harvesting using WPPG represents a promising alternative energy route for future applications. Full article

This study examines the economic and financial implications of the upcycling process and Design for Disassembly (DfD) applied to an “authorial” building. The objective is to examine the economic benefits deriving from the reuse of construction materials by quantifying the savings obtained through the reduction of disposal costs and CO₂ emissions in comparison with a traditional linear economic model. The methodological approach has been developed with the aid of Building Information Modeling (BIM) in order to provide an accurate estimation of both costs and environmental impacts related to the disassembly and reuse of materials. The financial analysis is based on local market prices to assess the savings associated with the reuse of building components compared to their disposal in landfills. The case study demonstrates the feasibility of this approach under real conditions, underscoring the transformative potential of upcycling in the construction industry, highlighting how this strategy can simultaneously improve economic efficiency and reduce environmental impact. The research offers a significant contribution to the debate on sustainable building practices and may serve as a starting point for future investigations. Full article

This study investigates sustainability-oriented design and production practices in Slovenia, focusing on brand-led approaches grounded in local innovation, cultural heritage and community engagement. Through mapping of Slovenian fashion enterprises, the research identifies and analyzes core sustainability and circularity strategies including zero- and low-waste design, recycling, upcycling and the development of adaptable, long-lasting garments. Further attention is given to participatory design methods involving consumers, the strategic social media use for community building and service-based circular economy models such as lifetime garment repair. Technological and production innovations, localized supply chains and small-scale production models are assessed for their role in reducing environmental impact and advancing sustainable supply chain management. The study also analyzes initiatives to shorten the fashion loop, including dematerialization and production minimization, as pathways to reduce resource consumption. Methodologically, the study combines empirical fieldwork, participant observation and literature review to deliver a comprehensive analysis of Slovenia’s sustainable fashion sector. The findings contribute to the global discourse on regional and place-based sustainability in fashion demonstrating how design-driven, small- and medium-sized enterprises can integrate circular economy principles, cultural continuity and collaborative innovation to foster environmentally responsible and socially embedded fashion. Full article

As a renewable and carbon-storing raw material, wood is playing an increasingly important role in the transformation of the construction sector towards a circular economy (CE). However, extant scientific studies have largely analyzed its technical, environmental, and social aspects in isolation from one another. The present article provides a problem-oriented and conceptual narrative overview, integrating these three dimensions from a design perspective. The objective of this study is not to provide a systematic review of the extant literature, but rather to structure existing knowledge by categorizing topics as follows: well-recognized, moderately developed, and niche. This approach enables the identification of gaps and links relevant to architectural practice. A qualitative thematic approach was adopted, underpinned by a comprehensive analysis of peer-reviewed articles sourced from the Scopus and Web of Science databases. This approach was further enriched by the incorporation of a select array of highly cited sources, serving to substantiate the study’s findings and provide a comprehensive overview of the pertinent literature. The review identified four research areas with high potential but low recognition: digital tracking of the life cycle of wooden elements, upcycling of low-quality wood, development of innovative wood-based materials, and socio-cultural acceptance of CE-based architecture. These subjects are currently marginal in the field of research, despite their significant implications for design strategies, adaptive resource use, and the development of interdisciplinary tools. The article posits the necessity of integrating materials science, digital technologies and architectural theory as a prerequisite for the scalable development of circular wood construction. The proposed classification provides a conceptual framework to support further research and guide innovation in the built environment. Full article

This article provides a critical review of the current design and research challenges in contemporary timber architecture. Conducted from the perspective of a designer-researcher, the review focuses on the role of wood as a material at the intersection of environmental performance, cultural meaning, and spatial practice. The study adopts a conceptual, problem-oriented approach, eschewing the conventional systematic aggregation of existing data. The objective of this study is to identify, interpret and categorise the key issues that are shaping the evolving discourse on timber architecture. The analysis is based on peer-reviewed literature published between 2020 and 2025, sourced from the Scopus and Web of Science Core Collection databases. Fifteen thematic challenges have been identified and classified according to their recognition level in academic and design contexts. The subjects under discussion include well-established topics, such as life cycle assessment and carbon storage, as well as less commonly explored areas, such as symbolic durability, social acceptance, traceability, and the upcycling of low-grade wood. The review under consideration places significant emphasis on the importance of integrating technical, cultural, and perceptual dimensions when evaluating timber architecture. The article proposes an interpretive framework combining design thinking and transdisciplinary insights. This framework aims to bridge disciplinary gaps and provide a coherent structure for understanding the complexity of timber-related challenges. The framework under discussion here encourages a broader understanding of wood as not only a sustainable building material but also a vehicle for systemic transformation in architectural culture and practice. The study’s insights may support designers, educators, and policymakers in identifying strategic priorities for the development of future-proof timber-based design practices. Full article

The rapid growth of the wind energy sector has led to a rising number of retired wind turbine blades (RWTBs) globally, posing significant environmental and logistical challenges for sustainable waste management. Handling enormous RWTBs at their end of life (EoL) has a significant negative impact on resource conservation and the environment. Conventional disposal methods, such as landfilling and incineration, raise environmental concerns due to the non-recyclable composite material used in blade manufacturing. This study explores the upcycling potential of RWTBs as innovative construction materials, addressing both waste reduction and resource efficiency in the construction industry. By exploring recent advancements in recycling techniques, this research highlights applications such as structural components, lightweight aggregates for concrete, and reinforcement elements in asphalt pavements. The key findings demonstrate that repurposing blade-derived materials not only reduces landfill dependency but also lowers carbon emissions associated with conventional construction practices. However, challenges including material compatibility, economic feasibility, and standardization require further investigation. This study concludes that upcycling wind turbine blades into construction materials offers a promising pathway toward circular economy goals. To improve technical methods and policy support for large-scale implementation, it recommends collaboration among different fields, such as those related to cementitious and asphalt materials. Full article

The large-scale disposal of loquat (Eriobotrya japonica Lindl.) flowers during fruit thinning represents a significant waste of bioactive resources. This study systematically evaluated how three processing methods—fresh (FS), heat-dried (HD), and freeze-dried (FD) treatments—affect the flavonoid composition and antioxidant capacity of loquat flower extracts, with the aim of developing value-added, sugar-free functional tea ingredients. Using UPLC-MS/MS and DPPH assays, we analyzed both pre-(FS/HD/FD) and post-extraction samples (FSP/HDP/FDP) to assess processing-specific metabolic signatures and extraction efficiency. The results revealed that heat-dried powder (HDP) exhibited the highest total flavonoid content and DPPH scavenging capacity (615.24 µg Trolox/g), attributed to enhanced release of stable compounds like quercetin. Freeze-dried powder (FDP) better preserved heat-sensitive flavonoids, such as catechin-(4α→8)-gallocatechin and naringenin, but showed lower overall antioxidant activity. Multivariate analysis confirmed distinct clustering patterns, with heat-drying favoring flavonoid extractability while freeze-drying maintained metabolic diversity. These findings demonstrate that processing methods significantly influence bioactive compound retention and functionality, with heat-drying offering optimal balance between yield and practicality for industrial applications. This work provides a scientific foundation for upcycling loquat flowers into standardized nutraceutical ingredients, addressing both agricultural waste reduction and the growing demand for natural functional foods. Full article