Biblioteca do Café
URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/1
Navegar
3 resultados
Resultados da Pesquisa
Item Antioxidant and antimicrobial activity of cathode and anode water in Coffea arabica L. seeds(Associação Brasileira de Tecnologia de Sementes - ABRATES, 2021) Vilela, Ana Luiza Oliveira; Rosa, Sttela Dellyzete Veiga Franco da; Coelho, Stefânia Vilas Boas; Fávaris, Nathália Aparecida Bragança; Fantazzini, Tatiana Botelho; Baute, Júlia LimaSeed deterioration induces the formation of free radicals and proliferation of microorganisms, but the application of external antioxidants may lessen these effects. The aim of this study was to investigate the antioxidant and antimicrobial activity of cathode and anode water on the physiological quality and health of Coffea arabica L. seeds. Part of the seeds were soaked in cathode water and the other part in anode water for periods of 1, 6, 12, 24, and 36 hours. The physiological quality of the seeds was evaluated by the germination test and tetrazolium test, and seed health by the Blotter test. Analysis of variance and Pearson correlation analysis were performed on the data for all the response variables. Soaking in cathode water or anode water up to 24 hours improves the physiological quality of coffee seeds. Anode water has a beneficial effect on the health of coffee seeds, reducing the incidence of Fusarium spp., Penicillium spp., Cladosporium spp., and Alternaria spp. after one hour of soaking and of Aspergillus spp. after six hours. Soaking in cathode water for a period of one hour leads to a reduction in the fungi Aspergillus spp., Fusarium spp., Cladosporium spp., and Alternaria spp., and reduction in Penicillium spp. after six hours.Item Cryopreservation in Coffea canephora Pierre seeds: slow and fast cooling(Editora UFLA, 2018-11) Coelho, Stefânia Vilas Boas; Rosa, Sttela Dellyzete Veiga Franco da; Fantazzini, Tatiana Botelho; Baute, Júlia Lima; Silva, Luciano CoutinhoCoffee is one of the main agricultural commodities in the country, and it is important to conservation of plant material for breeding programs. Cryopreservation is a promising alternative for preserving in the long-term the germplasm of species considered recalcitrant. However, studies should be performed to achieve maximum survival of seedlings after immersion in liquid nitrogen. The objective of this work was to find a cryopreservation protocol for storing seeds of Coffea canephora, studying two methods of cryopreservation, slow and fast cooling. Seeds were subjected to drying in silica gel up to the water content of 0.25 g g -1 . In the first experiment, dried seeds were subjected to treatments of slow cooling at speeds of -1 oC min -1 ,-3 oC min -1 and -5 oC min -1 until the end temperatures of -40 oC, -50 oC and -60 oC, by means of a bio freezer and subsequently immersed in liquid nitrogen. In the second experiment, the best result was selected of the first experiment and compared with the rapid cooling, in which dried seeds, with 0.25 g g -1 of water content, were immersed directly into liquid nitrogen. Physiological and biochemical alterations occurring in the seeds after cryopreservation were evaluated. Coffea canephora seeds respond better to cryopreservation by rapid cooling, when compared to slow cooling. Drying, one of the cryopreservation steps does not affect the viability of Coffea canephora Pierre seeds, when these seeds are dried to 0.25 g g -1 of water content. Catalase and esterase enzymes are good biochemical markers for cryopreserved coffee seeds and their activity is greater in larger seed physiological quality.Item Colorimetria em grãos de café submetidos a diferentes métodos de processamentos e armazenados em ambiente resfriado(Embrapa Café, 2013) Abreu, Giselle Figueiredo de; Rosa, Sttela Dellyzete Veiga Franco da; Caixeta, Franciele; Clemente, Aline da Consolação Sampaio; Pereira, Cristiane Carvalho; Coelho, Stefânia Vilas BoasA avaliação da cor de grãos de café torna-se importante uma vez que cafés descoloridos ou com diferentes níveis de branqueamento receberão menores preços no mercado. Além da desvalorização comercial, as alterações na cor são um indicativo da ocorrência de processos oxidativos e alterações bioquímicas de natureza enzimática que irão alterar qualitativa e quantitativamente a composição dos percursores do sabor e aroma dos grãos, resultando em queda da qualidade da bebida. Assim, este trabalho tem como objetivo avaliar a cor dos grãos de café processados e beneficiados por diferentes métodos. Frutos de Coffea arábica foram colhidos no estádio cereja e processados por via úmida (fermentação em água) e por via seca (secados nos próprios frutos). Três tratamentos de beneficiamento foram utilizados: manual, mecânico e sem beneficiamento. O experimento constituiu em fatorial 2x3, sendo dois tipos de processamento (natural e despolpado) e três tratamentos de beneficiamento (manual, mecânico e sem beneficiamento). A cor dos grãos foi determinada em colorímetro Minolta® CR 310 (iluminante C e ângulo 10º) por meio dos parâmetros “L” (luminosidade), “a” e “b” (coordenadas de cromaticidade). Conclui-se que a avaliação da coloração permite discriminar melhor lotes de café em fase de deterioração, antes mesmo de afetar a qualidade sensorial. O resfriamento do ar durante o armazenamento propicia a manutenção da qualidade fisiológica dos grãos por mais tempo, reduzindo o branqueamento dos grãos de café.