Navegando por Assunto "Planejamento experimental"

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Acesso aberto (Open Access)
Avaliação da qualidade de sementes Vigna unguiculata (L.) Walp após processo de secagem em leito de jorro
(Universidade Federal do Pará, 2015-03) CORUMBÁ, Lorena Gomes; COSTA, Cristiane Marial Leal; http://lattes.cnpq.br/0581730621014796; FARIA, Lênio José Guerreiro de; http://lattes.cnpq.br/7428609361678173
The variety of cowpea (Vigna unguiculata L. Walp.), known as manteiguinha beans, is native from Amazon region, the cultivation is mainly done by small producers dominated by family farms. The physiological quality of manteiguinha bean seeds, in concern to the germination and emergence rate index are directly connected to the moisture content of the seeds. Therefore, are required studies to evalute the behavior of seeds such as beans their potential hygroscopic and drying conditions. In intention for contribute to improvements in agricultural productivity cowpea, the main objective of this study was to qualitative evaluate of manteiguinha beans seeds behind drying process in conventional spouted bed. In this context, it was first defined the physical, chemical and physiological characteristics of fresh seed according to obtain their moisture sorption isotherms at temperatures of 40, 55 and 70 °C. The thermodynamic parameters of sorption, as isosteric heat, and entropy change in Gibbs free energy were evaluated from the GAB model and through Clausius-Clapeyron and Gibbs-Helmholtz relations. The compensation theory enthalpy-entropy was properly applied to the isotherms indicating that the moisture sorption phenomenon in manteiguinha bean seeds is controlled by enthalpy. To carry on the drying process were defined operating conditions of the spouted bed trhough fluidodynamics parameters analysis (maximum pressure drop, pressure drop in stable spout, pressure drop in the minimum spouting and the minimum spouting velocity). In carry out of the drying tests were applied to experimental design technique Box-Behnken and through statistical analysis of the experimental data was possible to evaluate the influence of input variables: air temperature (Tar), air velocity (Uar) and time drying (t) on the responses, moisture ratio (XR), germination percentage (G) and emergence speed index (ESI). The optimal point of the drying process, estimated by global desirability function obtained when the bed particles operated at temperature and drying air rate of 57 °C and 0.934 m / s, respectively, for a period of 240 minutes. These conditions are obtained seeds with final humidity 0,12 kg water/ kg dry solid, germination of 82.53% and 14.73 and emergence speed index.
Acesso aberto (Open Access)
Avaliação do efeito da combinação de pectina, gelatina e alginato de sódio sobre as características de gel de fruta estruturada a partir de "mix" de polpa de cajá e mamão, por meio da metodologia de superfície de resposta
(Instituto Nacional de Pesquisas da Amazônia, 2011) CARVALHO, Ana Vânia; MATTIETTO, Rafaella de Andrade; ASSIS, Glaucy Takeda; LOURENÇO, Lúcia de Fátima Henriques
The objective of this work was to establish a technological procedure for producing a structured fruit product from yellow mobin and papaya purees, as an attempt to combine the sensory properties of both fruits and potentialize the functional properties of the final product. The effect of different combinations of pectin, gelatin and sodium alginate on the fruit gel properties was evaluated by response surface methodology. Papaya and yellow mobin purees and the structured products were characterized in terms of functional compounds (total tannin and carotenoid contents), as well as centesimal composition, pH, titratable acidity, soluble solids, sugars, water activity, carbohydrates and total energetic value. The results obtained from the experimental design indicated that only the gelatin concentration affected the product firmness. The developed fruit structured products presented good acceptance for all evaluated attributes. The data concerning purchase intent indicated that 70% of the panelists would probably or certainly purchase the mixed yellow mobin and papaya structured product if they found it for sale.
Acesso aberto (Open Access)
Ferramentas estatísticas aplicadas nos diferentes métodos de secagem de gelatina de peixe e no desenvolvimento de bala de goma comestível
(Universidade Federal do Pará, 2021-11-22) MATIAS, Cleidiane da Silva Araújo; REGO, José de Arimateia Rodrigues do; http://lattes.cnpq.br/4163468898377462; https://orcid.org/0000-0003-0891-6438; LOURENÇO, Lúcia de Fátima Henriques; http://lattes.cnpq.br/7365554949786769; https://orcid.org/0000-0001-5009-8235
Fish skin gelatin is a collagen product partially denatured by heat, with great potential for application in several areas of industry and thus the use of this biomaterial will add value to waste from the fishing industry and will contribute to reducing environmental impacts. The objectives of this study were: a) to optimize the drying methods by forced convection of hot air and combined with infrared radiation of gelatin extracted from fish skins, using fractional planning and rotational central composite design; b) verify the effect of different drying methods (freeze-drying, forced hot air convection, combined method, infrared radiation and refractance window) on the technological, functional, structural, thermal and rheological properties of gelatin, evaluated by ANOVA and principal component analysis; and c) prepare gummy candy using fish gelatin, cassava starch and powdered cupuaçu, through mixing planning. According to the results obtained, the desirability function showed that 59.14 °C for 12.35 h was the most effective condition for hot air convection drying and for the combined process, the optimized region was infrared temperature and drying time. 70 °C/2h with oven time/temperature of 3.51h at 70 °C. Regarding the evaluation of the five drying methods, the results were that the principal component analysis explained the accumulated variation of 99.87% of the data and that lyophilization was the method that provided the best preservation of gelatin properties, although drying convective and refractance window also showed good results, demonstrating that they are techniques with great potential for the production of gelatin. The desirability function defined the best conditions for the elaboration of the gum, in 25% of fish gelatin, 15% of cassava starch and 7% of cupuaçu powder. Therefore, the relevance of controlling the variables of the drying methods as a strategy for the production of biomaterials with standardized biochemical composition is of great interest, to obtain desirable physical, technological and functional properties necessary for the different applications of gelatin. In addition, the study suggests that there is great potential in the use of fish gelatin associated with the use of cassava and cupuaçu starch in the preparation of confectionery gum, providing better technological and functional properties of the final product
Acesso aberto (Open Access)
Produção de biodiesel a partir do processamento das oleaginosas amazônicas compadre-do-azeite (Plukenethia polyadenia) e comadre-do-azeite (Onphalea diandra)
(Universidade Federal do Pará, 2014-06) FURTADO, Matheus Braga; MACÊDO, Emanuel Negrão; http://lattes.cnpq.br/8718370108324505; FARIA, Lênio José Guerreiro de; http://lattes.cnpq.br/7428609361678173
Analyse experimentally the production of biodiesel from oilseeds processing compadre of Amazonian oil (plukenethia polyadenia) and Ruth-of-oil (Aubrey onphalea), as a potentially viable alternative to compose the energy matrix. Since the Industrial Revolution in the 19th century, the world energy matrix has always been based on fossil fuels. With the scarcity of such fuels, the rise of prices caused with the constant conflicts in major producing regions, has become the research into renewable sources increasingly attractive. The study of new sources of vegetable oils as alternative energy is important for the Country, particularly for the Amazon; enabling structure of oilseeds production chains in the region, generating employment in the field, distributional effects on regional economy and a vector of sustainable development in the Amazon, no aggression to the environment. The purpose of this work is to study two species of the family euphorbiaceae, lianas and polyadenia Onphalea Plukenethia diandra, better known as compadre of the olive oil and the olive oil Cummer respectively, oil-producing; extract and characterize them, suggesting possible applications and using them for the production of biodiesel through Transesterification using methyl potassium hydroxide as a catalyst, in the case the process based on statistical tests planned. The influence of input variables: oil/alcohol concentration, temperature and concentration of catalyst on biodiesel yield response by response surface methodology (RSM) employing the Box-Behenken planning. The aim is thus to add value to a tailing kaolin processing industry, using zeolites produced this material as a catalyst to KOH, comparing the efficiencies of the two treatments. The Box-planning Benhken proved efficient to optimize the homogeneous catalysis of the biodieseis, concluding that the concentration of the catalyst was the variable controlling the production process of biodieseis, and the increase of its concentration cause negative and undesirable influence the yield of the product.