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dc.contributor.authorBarbosa, Bruno Sergio Toledo-
dc.date.accessioned2026-08-24T13:42:21Z-
dc.date.available2026-08-24T13:42:21Z-
dc.date.issued2026-04-10-
dc.identifier.citationBARBOSA, Bruno Sérgio Toledo. Conjugados formados por proteínas da clara de ovo e ácido ferúlico para sua aplicação em sistemas de carreamento de substâncias bioativas hidrofóbicas. 2026. 190 f. Tese (Doutor em Ciência e Tecnologia de Alimentos) - Instituto de Tecnologia, Universidade Federal Rural do Rio de Janeiro, Seropédica, 2026.pt_BR
dc.identifier.urihttp://rima.ufrrj.br/jspui/handle/20.500.14407/26158-
dc.description.abstractA crescente demanda por alimentos funcionais e sustentáveis tem impulsionado a busca por ingredientes naturais capazes de oferecer benefícios à saúde além da nutrição básica. Nesse contexto, proteínas e compostos fenólicos destacam-se por suas propriedades tecnofuncionais e biológicas. A interação entre proteínas e polifenóis pode ocorrer por associações não covalentes ou covalentes. A interação covalente, também denominada conjugação, resulta em modificações estruturais irreversíveis na proteína, impactando sua solubilidade, capacidade emulsificante, formação de espuma e capacidade antioxidante. Dessa forma, a formação de conjugados proteína–fenólico surge como uma estratégia promissora para a obtenção de novos componentes alimentares com funcionalidades ampliadas. A tese teve como objetivo desenvolver e caracterizar conjugados formados entre ovalbumina e lisozima, principais proteínas da clara de ovo, e o ácido ferúlico, bem como avaliar sua aplicação como agentes emulsificantes em emulsões Pickering para o carreamento de compostos bioativos e posterior incorporação em filmes comestíveis. A conjugação promoveu modificações estruturais significativas nas proteínas. No caso da ovalbumina, a conjugação covalente com o ácido ferúlico, obtida por meio da técnica alcalina, promoveu alterações nas estruturas secundária e terciária, além de aumento da hidrofobicidade superficial, resultando em melhorias expressivas na capacidade emulsificante e na capacidade de formação de espuma da proteína, bem como em aumento estatisticamente significativo da capacidade antioxidante. Para os conjugados lisozima–ácido ferúlico, obtidos pela técnica de radicais livres, também foram observadas modificações estruturais relevantes, refletindo em aprimoramento das propriedades tecnofuncionais. Adicionalmente, a conjugação contribuiu para a proteção da capacidade antioxidante do ácido ferúlico após simulação gastrointestinal in vitro, indicando maior estabilidade frente às condições digestivas. Os conjugados mostraram-se alternativas eficazes como agentes emulsificantes em emulsões Pickering óleo em água. As emulsões formuladas com conjugados de ovalbumina–ácido ferúlico apresentaram boa estabilidade cinética, sem separação de fases por até 8 dias, além de menor oxidação lipídica em comparação às emulsões estabilizadas apenas com ovalbumina nativa. Para a encapsulação de vitamina D, observou-se elevada eficiência de encapsulação, 92,13 ± 1,14%, contribuindo para a proteção do micronutriente frente à degradação fotoquímica. Emulsões Pickering formuladas com conjugados de lisozima–ácido ferúlico e carregadas com β-caroteno também apresentaram alta estabilidade cinética e oxidativa, além de eficiência de encapsulação de 88,99 ± 2,02%. A incorporação das emulsões em filmes de pectina modificou as propriedades estruturais e de barreira do material. Os filmes contendo β-caroteno microencapsulado apresentaram coloração amarelada, maior barreira à luz, menor permeabilidade ao vapor de água e menor solubilidade. A adição das emulsões aumentou a hidrofobicidade superficial dos filmes. A liberação do β- caroteno foi descrita pelos modelos de Ritger–Peppas e Peppas–Sahlin, com comportamento de difusão Fickiana. Em conjunto, os resultados demonstram que a conjugação proteína–ácido ferúlico constitui uma estratégia eficiente para o desenvolvimento de componentes multifuncionais com potencial aplicação em alimentos funcionais e embalagens bioativaspt_BR
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESpt_BR
dc.languageporpt_BR
dc.publisherUniversidade Federal Rural do Rio de Janeiropt_BR
dc.subjectPickering emulsionspt_BR
dc.subjectmicroencapsulationpt_BR
dc.subjectvitamin Dpt_BR
dc.subjectβ-carotenept_BR
dc.subjectbioactive filmspt_BR
dc.subjectemulsões Pickeringpt_BR
dc.subjectmicroencapsulaçãopt_BR
dc.subjectvitamina Dpt_BR
dc.subjectβ-carotenopt_BR
dc.subjectfilmes bioativospt_BR
dc.titleConjugados formados por proteínas da clara de ovo e ácido ferúlico para sua aplicação em sistemas de carreamento de substâncias bioativas hidrofóbicaspt_BR
dc.title.alternativeConjugates formed by egg white proteins and ferulic acid for application in delivery systems of hydrophobic bioactive compoundsen
dc.typeTesept_BR
dc.description.abstractOtherThe growing demand for functional and sustainable foods has driven the search for natural ingredients capable of providing health benefits beyond basic nutrition. In this context, proteins and phenolic compounds stand out due to their techno-functional and biological properties. Protein–polyphenol interactions may occur through non-covalent or covalent associations. Covalent interaction, also referred to as conjugation, results in irreversible structural modifications of proteins, affecting their solubility, emulsifying capacity, foaming properties, and antioxidant activity. Thus, the formation of protein–phenolic conjugates emerges as a promising strategy for obtaining novel food components with enhanced functionalities. This thesis aimed to develop and characterize conjugates formed between ovalbumin and lysozyme, the main egg white proteins, and ferulic acid, as well as to evaluate their application as emulsifying agents in Pickering emulsions for the delivery of bioactive compounds and subsequent incorporation into edible films. Conjugation promoted significant structural modifications in the proteins. In the case of ovalbumin, covalent conjugation with ferulic acid obtained by the alkaline method led to changes in secondary and tertiary structures, along with increased surface hydrophobicity, resulting in marked improvements in emulsifying and foaming capacities, as well as a statistically significant increase in antioxidant activity. For lysozyme–ferulic acid conjugates obtained by the free radical method, relevant structural modifications were also observed, leading to improved techno-functional properties. In addition, conjugation protected the antioxidant activity of ferulic acid after in vitro gastrointestinal simulation, indicating greater stability under digestive conditions. The conjugates proved to be effective alternatives as emulsifying agents in oil-in-water Pickering emulsions. Emulsions formulated with ovalbumin–ferulic acid conjugates exhibited good kinetic stability, with no phase separation for up to 8 days, and lower lipid oxidation compared with emulsions stabilized with native ovalbumin. For vitamin D encapsulation, a high encapsulation efficiency, 92.13 ± 1.14%, was achieved, contributing to the protection of the micronutrient against photochemical degradation. Pickering emulsions formulated with lysozyme–ferulic acid conjugates and loaded with β-carotene also showed high kinetic and oxidative stability, as well as an encapsulation efficiency of 88.99 ± 2.02%. The incorporation of these emulsions into pectin-based films modified the structural and barrier properties of the material. Films containing microencapsulated β-carotene exhibited a characteristic yellowish coloration, enhanced light barrier properties, reduced water vapor permeability, and lower water solubility. The addition of the emulsions increased the surface hydrophobicity of the films. β- Carotene release was described by the Ritger–Peppas and Peppas–Sahlin models, with Fickian diffusion behavior. Overall, the results demonstrate that protein–ferulic acid conjugation is an efficient strategy for developing multifunctional components with potential applications in functional foods and bioactive packagingen
dc.contributor.advisor1Rojas, Edwin Elard Garcia-
dc.contributor.advisor1IDhttps://orcid.org/0000-0003-3388-8424pt_BR
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/1205756654416987pt_BR
dc.contributor.referee1Rojas, Edwin Elard Garcia-
dc.contributor.referee1IDhttps://orcid.org/0000-0003-3388-8424pt_BR
dc.contributor.referee1Latteshttp://lattes.cnpq.br/1205756654416987pt_BR
dc.contributor.referee2Silva, César Augusto Sodré da-
dc.contributor.referee2Latteshttp://lattes.cnpq.br/1355096492643102pt_BR
dc.contributor.referee3Tonon, Renata Valeriano-
dc.contributor.referee3Latteshttp://lattes.cnpq.br/3777203586166795pt_BR
dc.contributor.referee4Saldanha, Tatiana-
dc.contributor.referee4IDhttps://orcid.org/0000-0003-4291-4639pt_BR
dc.contributor.referee4Latteshttp://lattes.cnpq.br/4490420513661579pt_BR
dc.contributor.referee5Bernardo, Yago Alves de Aguiar-
dc.contributor.referee5IDhttps://orcid.org/0000-0001-8778-3236pt_BR
dc.contributor.referee5Latteshttp://lattes.cnpq.br/9883010350159417pt_BR
dc.creator.Latteshttp://lattes.cnpq.br/3414895221829710pt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentInstituto de Tecnologiapt_BR
dc.publisher.initialsUFRRJpt_BR
dc.publisher.programPrograma de Pós-Graduação em Ciência e Tecnologia de Alimentospt_BR
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dc.subject.cnpqCiência e Tecnologia de Alimentospt_BR
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