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Elaboração de produtos à base de tilápia do Nilo (Oreochromis niloticus) para alimentação humana

Fri, 24 Apr 2026 00:00:00 GMT

Title: Elaboração de produtos à base de tilápia do Nilo (Oreochromis niloticus) para alimentação humana Autor: Dentz, Bruna Alessandra Von Primeiro orientador: Feiden, Aldi Abstract: As global fish production increases, new fish-based products are being developed and marketed to introduce and encourage consumption among those who do not typically eat fish. This study aimed to analyze two products: the first involved the production of jarred tilapia presented both as whole fillets and as a pâté which underwent sensory, shelf-life, and microbiological analyses. Results showed that while the whole-fillet product was well-accepted by consumers, the pâté version performed even better; this demonstrates that producing such items offers a sustainable way to utilize fish that would otherwise be discarded by the industry for failing to meet commercial standards. The second product was a pizza dough made from rice and oat flours with and without added fish flour designed for individuals with wheat, milk, or egg intolerances or allergies. It specifically targets consumers who enjoy fish but seek options that accommodate their dietary restrictions while offering convenience through unconventional formats, such as enriched doughs. Affective sensory analyses specifically acceptance and purchase intention tests were conducted; both products received similar scores and were well-received by panelists. The study concludes that these products add value to fish in a straightforward manner, making the manufacture of items like pizza dough an excellent option for micro-enterprises or small-scale agro-industries. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Tese

Integração de geotecnologias e análise hidrogeotécnica na segurança de barragem de um lago urbano sob eventos pluviométricos

Mon, 09 Mar 2026 00:00:00 GMT

Title: Integração de geotecnologias e análise hidrogeotécnica na segurança de barragem de um lago urbano sob eventos pluviométricos Autor: Costa, Leonan Coelho da Primeiro orientador: Makrakis, Maristela Cavicchioli Abstract: This research evaluated the safety of the barrage of the Municipal Lake of Toledo, Paraná, by means of the integration of geotechnologies and hydrogeotechnical monitoring, considering the influence of two pluviometric events on the hydrological dynamics of the microbacia of Sanga Panambi. The study was structured in two complementary studies. Initially, an integrated topobatimetric characterization of the Municipal Lake and Sanga Panambi was carried out, using surveys with GNSS RTK, ecobathmeter, unmanned aerial vehicle and geoprocessing tools, aiming to represent the morphology, or relay and armament capacity of two water bodies. Subsequently, hydrogeotechnical monitoring of the barrage was carried out, with records of precipitation, linimetric levels, phreatic line by half of piezometers and vacuums in the lake in Sanga Panambi, integrated by statistical and spatial analyses. The topobathymetric results will allow identifying flat areas, transition zones, deep depressions and assessment patterns, in addition to estimating normal volume of 49,759.69 m³ and maximum volume of 143,157.86 m³ for the Municipal Lake. The difference between the scenarios shows the regulatory function of the reservoir in the damping of pressure peaks. The hydrogeotechnical monitoring demonstrates a consistent relationship between precipitation events, elevation of the reservoir levels, increase in current vazões and temporary alterations in the piezometric conditions of the mass. The water located in the lake presents a lower amplitude of variation, while the points located in Sanga Panambi will respond more quickly and intensely to the rainwater. Despite the sensitivity of the structure to rainfall events, no critical conditions of geotechnical instability or compromise of hydraulic performance have been identified during the monitored period. It is concluded that the integration between geotechnologies and pluviometric, linimetric, fluviometric and piezometric data constitutes an efficient approach to characterize urban water systems, assess cliffs and support the monitoring of barrage security. The results provide technical subsidies for urban and environmental planning, cliff management, development and updating of barrage safety instruments and adoption of preventive measures in urban areas subject to hydrological variability. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Tese

Prospecção de bactérias produtoras de biossurfactantes em áreas de transição (portos)

Mon, 01 Dec 2025 00:00:00 GMT

Title: Prospecção de bactérias produtoras de biossurfactantes em áreas de transição (portos) Autor: Batista, Paula Frassinetti da Silva Primeiro orientador: Makrakis, Sergio Abstract: Biosurfactants, amphiphilic compounds produced by microorganisms, have attracted increasing interest due to their biodegradability, low toxicity, and effectiveness under diverse environmental conditions, making them promising alternatives to synthetic surfactants in remediation processes and industrial applications. This dissertation is structured into two complementary chapters. The first chapter presents a systematic review on the prospecting of biosurfactants in transitional ecosystems, such as mangroves, port areas, and coastal zones, with emphasis on their applications in bioremediation. Sixteen articles published between 2015 and 2025 were analyzed, selected from international databases (Scopus, Web of Science, and PubMed). The studies indicate a predominance of biosurfactants belonging to the glycolipid and lipopeptide classes, produced mainly by bacteria of the genera Pseudomonas, Bacillus, and Rhodococcus, as well as yeasts such as Candida and Starmerella. A growing trend toward the use of agro-industrial residues as substrates was also observed, reinforcing the alignment of these technologies with sustainability principles and the circular economy. The reported applications demonstrate high efficiency of biosurfactants in the solubilization and mobilization of pollutants, including hydrocarbons and heavy metals, highlighting their strategic role in the bioremediation of impacted transitional environments. In the second chapter, an experimental study was conducted to prospect biosurfactant-producing bacteria in port areas of the municipality of Piúma, Espírito Santo, Brazil, characterized by contamination from diesel oil. Sediment samples were collected from points of high vessel traffic, resulting in the isolation of seven bacterial strains. These isolates were cultivated in minimal salt medium (MSM), using diesel oil as the sole carbon source. The surfactant activity of the produced metabolites was evaluated using drop-collapse and oil-spreading tests, as well as the emulsification index (E24), employing diesel oil and gasoline as oily phases. The biosurfactants exhibited low emulsifying activity against diesel oil (E24 < 10%); however, they demonstrated moderate efficiency in the emulsification of gasoline, with indices reaching approximately 35% for some isolates, indicating greater affinity for light hydrocarbons. Taken together, the findings from the systematic review and the experimental study reinforce the potential of biosurfactants as valuable tools for the remediation of contaminated environments and highlight the importance of transitional ecosystems— such as mangroves and port areas—as reservoirs of microorganisms with biotechnological relevance. The integration of these approaches contributes to advancing knowledge on the microbial diversity involved in biosurfactant production, their applications, and the remaining challenges related to large-scale production and the economic feasibility of these bioproducts in environmental and industrial contexts. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Dissertação

Liofilização de produtos aquáticos: tendências científicas, desafios atuais e influência da geometria de corte na qualidade de filés de tilápia-do-Nilo (Oreochromis niloticus)

Mon, 09 Mar 2026 00:00:00 GMT

Title: Liofilização de produtos aquáticos: tendências científicas, desafios atuais e influência da geometria de corte na qualidade de filés de tilápia-do-Nilo (Oreochromis niloticus) Autor: Souza, Pauliana Leão de Primeiro orientador: Signor, Altevir Abstract: In this review, we synthesize the literature on the freeze-drying of aquatic products to analyze the current state of research on this topic worldwide. In total, 345 publications met the inclusion criteria. It was observed that, from 1958 onwards, the volume of published studies grew considerably, distributed across 181 journals in the areas of Analytical Chemistry, Biochemistry, and Food Science and Engineering. The journals Food Chemistry (6.96%), International Journal of Biological Macromolecules (2.90%), Journal of Food Science (2.90%), and Journal of the Science of Food and Agriculture (2.90%) concentrated the largest number of publications. The study of freeze-drying in aquatic products has sparked the interest of researchers in 51 countries. However, scientific output has been concentrated in China (21.74%) and the United States (8.70%). In contrast, publications originating from Oceania, Africa, and Central America have remained scarce. Furthermore, although the research covered 12 different types of raw materials, fish (64.68%) was the main target of the investigations. Among the fish species, Nile tilapia (Oreochromis niloticus) was the one with the greatest interest for the application of the freeze-drying method (7.20%) in the studies. There was a predominance of studies involving muscle tissues and their derivatives (41.13%) and protein biomolecules (23.38%). The focus of most of the research was related to the areas of Food Engineering (48.93%) and Analytical Chemistry (17.91%). Predominance observed in most of the countries analyzed. However, although the scope of the studies has changed over the years, most publications have remained in already established areas. Furthermore, research is needed to reduce energy costs and improve equipment, aiming to expand access to freeze-drying in regions where its use is still limited. In addition, it is essential to delve deeper into underexplored fields such as Animal Health and Genetics, as well as investigations into the freeze-drying of aquatic by-products, with the goal of adding value and ensuring the sustainability of the process. Publisher: Universidade Estadual do Oeste do Paraná Tipo do documento: Tese