Centro Universitario Da Fundacao Of Ensino Octavio Bastos Unifeob

São João da Boa Vista, Brazil

Centro Universitario Da Fundacao Of Ensino Octavio Bastos Unifeob

São João da Boa Vista, Brazil
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Trentini C.P.,State University of Maringá | Santos K.A.,West Parana State University | Antonio da Silva E.,West Parana State University | Garcia V.A.D.S.,Centro Universitario Da Fundacao Of Ensino Octavio Bastos Unifeob | And 3 more authors.
Journal of Supercritical Fluids | Year: 2017

In this study, the extraction of macauba pulp oil (MPO) using compressed propane as a solvent was investigated, and compared with conventional (Soxhlet) extraction. Extractions with propane were carried out in order to investigate the effects of temperature (333-373. K) and pressure (4-12. MPa) on the oil yield and the chemical composition of the products. The effects of temperature and pressure on the yield were negative and positive, respectively, with a maximum yield of 23.08. wt% being obtained at 333. K and 12. MPa. The use of propane allowed a fast extraction with a yield of ∼86% in the conventional extraction. The fatty acids composition showed a predominance (∼85%) of oleic and palmitic acids. The β-carotene and flavonoid contents were affected by the compressed-solvent extraction conditions and extraction method. Oil obtained using compressed-solvent extraction showed higher levels of phytosteroids and tocopherols and, consequently, a longer oxidation induction time. © 2017 Elsevier B.V.


Ortiz R.W.P.,Federal University of Paraná | Beninca C.,Grande Rio University | Cardozo-Filho L.,State University of Maringá | Cardozo-Filho L.,Centro Universitario Da Fundacao Of Ensino Octavio Bastos Unifeob | Zanoelo E.F.,Federal University of Paraná
Industrial and Engineering Chemistry Research | Year: 2017

A set of chemical kinetic and phase-transition experiments was performed to investigate the competing conversions of fumaric acid into maleic and malic acids by isomerization and hydration, respectively. The reactions were carried out in sealed stainless steel batch reactors operated up to ∼1600 kPa and jacketed with glycerol at 398, 423, 448, and 473 K. The catalyst used was 0.97 M hydrochloric acid. To avoid excessive data near equilibrium, the reaction time was reduced from 720000 to 12600 s as the temperature of the heating fluid was increased. To ensure a homogeneous reaction, the solubility of fumaric acid in water was determined in the temperature range from 293 to 473 K using a high-pressure variable-volume sapphire view cell. The variation in the species concentration with time was determined by HPLC analysis of 12 reaction mixture samples per reaction run conducted twice under identical conditions. The parameters of the Arrhenius equation for the isomerization and hydration reactions were tuned on the kinetic experimental data by applying the Simplex method of optimization (k20 = 1.27 × 10-7 s-1, k30 = 1.29 × 107 s-1, Ea2/R = -2815 K, Ea3/R = 11260 K). © 2017 American Chemical Society.


Favareto R.,Instituto Federal Of Educacao | Teixeira M.B.,Instituto Federal Of Educacao | Soares F.A.L.,Instituto Federal Of Educacao | Belisario C.M.,Instituto Federal Of Educacao | And 3 more authors.
Journal of Supercritical Fluids | Year: 2017

In this study, the extraction of sucupira fruits (Ptedoron spp.) was conducted by using the supercritical carbon dioxide as solvent and the mass percent yield, chemical profile and the antioxidant activity of the extracts obtained were evaluated. The extractions were conducted in 313–333 K and 10–22 MPa. Extractions conditions were defined by phase transition measurements for the system CO2 (1) + sucupira extract (2). The phase equilibrium data were modeled using the Peng-Robinson equation with Wong-Sandler quadratic mixing rule. Sovová model was applied to fit the kinetic extraction curves. The extractions were conducted in 313–333 K and 10–22 MPa. The highest mass percent yield (21.2%) and the highest content of vouacapan diterpenes (35.66%) were obtained from the supercritical extraction on the conditions of 313 K and 22 MPa. Yet, the highest antioxidant activity (77.59%) was obtained at 323 K and 16 MPa. © 2017 Elsevier B.V.


Bertassoli B.M.,Federal University of Minas Gerais | Santos A.C.,University of Sao Paulo | De Oliveira F.D.,University of Sao Paulo | De Oliveira D.M.,University of Sao Paulo | And 2 more authors.
Ciencia Animal Brasileira | Year: 2013

Many species of opossums are created and used in laboratories, opening a wide field for studying and acquiring knowledge about the habits, diseases, diet and reproduction of these animals. The research aimed at describing the macroscopic and microscopical morphology of the trachea and larynx of opossums. In this study, five opossums (Didelphis sp.) wereused. The trachea and larynx of the opossums were extracted, measured and processed by histology routine and dyed with Hematoxiline eosine, Picrosirius and Massoń Trichrome. The larynx can be divided into: cricoid in a "V"-like shape, thyroid in a shield-like shape, arytenoid in shell-like shape, and epiglottis shaped like sheets, the first three structuresshowed hyaline cartilage, and the last structure showed elastic cartilage. The trachea showed a cylindrical form and it consists of 25 cartilaginous incomplete rings in a "C"-like shape, similar to amphibians, snakes, lizards and pigs; and different from domestic animals.

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