Please use this identifier to cite or link to this item: https://rima.ufrrj.br/jspui/handle/20.500.14407/20644
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dc.contributor.authorSilva, Mariá Toledo de Carvalho-
dc.date.accessioned2025-03-27T16:40:08Z-
dc.date.available2025-03-27T16:40:08Z-
dc.date.issued2023-09-15-
dc.identifier.citationSILVA, Mariá Toledo de Carvalho. Desenvolvimento de filme indicador de pH a partir de batata-doce de polpa roxa (ipomoea batatas (l.) lam) para monitoramento da qualidade de alimentos. 2023. 97 f. Tese (Doutorado em Ciência e Tecnologia de Alimentos) - Instituto de Tecnologia, Universidade Federal Rural do Rio de Janeiro, Seropédica, 2023.pt_BR
dc.identifier.urihttps://rima.ufrrj.br/jspui/handle/20.500.14407/20644-
dc.description.abstractReduzir perdas e desperdícios de alimentos ao longo da cadeia e, ao mesmo tempo, garantir a oferta de alimentos seguros e com sua qualidade nutricional e sensorial preservadas é um importante desafio para a cadeia de alimentos. Para isso, filmes inteligentes capazes de monitorar a qualidade do alimento e indicar o frescor e a segurança do produto embalado vêm sendo amplamente estudados. Dentre eles, estão os filmes indicadores de pH, obtidos pela associação de um pigmento sensível a alterações de pH e uma base polimérica. É o caso das antocianinas, pigmento amplamente presente no reino vegetal capaz de ter sua coloração alterada de acordo com o pH do meio em que se encontra. Assim, o objetivo deste trabalho foi desenvolver um filme indicador de pH utilizando batata-doce de polpa roxa, rica em antocianinas, para o acompanhamento dinâmico da qualidade de alimentos. A batata-doce de polpa roxa foi cozida e liofilizada resultando em um pó liofilizado de batata-doce (PLBD) uniforme e de coloração estável. A batata e o PLBD foram caracterizados quanto sua composição centesimal, teor de amido e de antocianinas monoméricas totais. Foram desenvolvidos filmes utilizando amido (4% m/v) e PLBD (0, 2 e 3g) com ou sem a adição de solução de carboximetilcelulose (CMC) (1,5% m/v). Os filmes foram avaliados quanto às suas propriedades físicas e mecânicas e sua capacidade de alteração de cor. Tanto o PLBD quanto os filmes desenvolvidos apresentaram alterações de cor visualmente perceptíveis em soluções tampões de diferentes valores de pH, variando de coloração rosa a tons esverdeados quando o pH aumentou de 1 para 11. A eficácia dos filmes indicadores foi avaliada pelo teste de deterioração da carne moída, que resultou na mudança de cor de roxo para verde quando o pH da carne aumentou de 5,54 para 7,92. O crescimento microbiológico e as alterações sensoriais da carne confirmaram o processo de deterioração ocorrido. Portanto, filmes biodegradáveis indicadores de pH foram desenvolvidos com sucesso sem a utilização de uma etapa prévia de extração das antocianinas, podendo ser utilizados no desenvolvimento de embalagens inteligentes capazes de indicar em tempo real a qualidade do alimento embalado.pt_BR
dc.description.sponsorshipConselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPqpt_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.subjectfilmes indicadores de pHpt_BR
dc.subjectantocianinapt_BR
dc.subjectdeterioração de alimentospt_BR
dc.subjectpH indicator filmspt_BR
dc.subjectanthocyaninpt_BR
dc.subjectfood spoilagept_BR
dc.titleDesenvolvimento de filme indicador de pH a partir de batata-doce de polpa roxa (ipomoea batatas (l.) lam) para monitoramento da qualidade de alimentospt_BR
dc.title.alternativeDevelopment of pH-indicator film from purple fleshed sweet potato (ipomoea batatas (l.) lam) for food quality monitoringen
dc.typeTesept_BR
dc.description.abstractOtherReducing food losses and waste throughout the chain and, at the same time, ensuring the supply of safe food with preserved nutritional and sensorial quality is an important challenge for the food chain. To this purpose, smart films capable of monitor the quality of the food and indicate the freshness and safety of the packaged product have been widely studied. Among them are pH indicator films, obtained by the association of a pigment sensitive to pH changes and a polymeric base. This is the case of anthocyanins, a pigment widely present in the plant kingdom capable of having its color changed according to the pH of the environment in which it is found. Thus, the objective of this work was to develop pH- indicator films using purple-fleshed sweet potatoes, which are rich in anthocyanins, to dynamically monitor the quality of the food. The purple-fleshed sweet potato was cooked and freeze-dried resulting in a uniform and color-stable freeze-dried sweet potato powder (PLBD). Potato and PLBD were characterized in terms of their proximate composition, starch content and total monomeric anthocyanins content. Films were developed using starch (4% w/v) and PLBD (0, 2 and 3g) with or without the addition of carboxymethylcellulose (CMC) solution (1.5% w/v). The films were evaluated for their physical and mechanical properties and their color-change ability. Both the PLBD and the developed films showed visually noticeable color changes when submerged in buffer solutions of different pH values, ranging from pink to greenish tones when the pH increased from 1 to 11. The effectiveness of the indicator films was evaluated by the test of ground beef spoilage, which resulted in the color changes from purple to green when meat pH increased from 5.54 to 7.92. The microbiological growth and sensory changes in the meat confirmed the deterioration process that had occurred. Therefore, biodegradable pH indicator films have been successfully developed without the use of a previous anthocyanin extraction step and can be used in the development of intelligent packaging capable of indicating in real time the quality of the packaged food.en
dc.contributor.advisor1Ferreira, Elisa Helena da Rocha-
dc.contributor.advisor1IDhttps://orcid.org/0000-0002-9701-1253pt_BR
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/9247021829603724pt_BR
dc.contributor.advisor-co1Machado, Mariana Teixeira da Costa-
dc.contributor.advisor-co1Latteshttp://lattes.cnpq.br/0032469366203941pt_BR
dc.contributor.advisor-co2Sato, Ana Carla Kawazoe-
dc.contributor.advisor-co2Latteshttp://lattes.cnpq.br/1781693799683797pt_BR
dc.contributor.referee1Ferreira, Elisa Helena da Rocha-
dc.contributor.referee1IDhttps://orcid.org/0000-0002-9701-1253pt_BR
dc.contributor.referee1Latteshttp://lattes.cnpq.br/9247021829603724pt_BR
dc.contributor.referee2Calado, Veronica Maria de Araújo-
dc.contributor.referee2IDhttps://orcid.org/0000-0002-1365-8990pt_BR
dc.contributor.referee2Latteshttp://lattes.cnpq.br/7950388015437635pt_BR
dc.contributor.referee3Nicolini, João Victor-
dc.contributor.referee3IDhttps://orcid.org/0000-0002-2690-9533pt_BR
dc.contributor.referee3Latteshttp://lattes.cnpq.br/0525713504125196pt_BR
dc.contributor.referee4Guerra, André Fioravante-
dc.contributor.referee4Latteshttp://lattes.cnpq.br/4426970348820801pt_BR
dc.contributor.referee5Soares, Ketly Pontes-
dc.contributor.referee5IDhttps://orcid.org/0000-0002-5836-7361pt_BR
dc.contributor.referee5Latteshttp://lattes.cnpq.br/0448051911163663pt_BR
dc.creator.Latteshttp://lattes.cnpq.br/7689888790278690pt_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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