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Mazutti M.A.,Federal University of Santa Maria | Voll F.A.P.,State University of Maringa | Cardozo-Filho L.,State University of Maringa | Corazza M.L.,Federal University of Parana | And 4 more authors.
Journal of Chemical Thermodynamics | Year: 2013

This work reports new liquid-liquid solubility values (binodal curves) as well as (liquid + liquid) equilibrium data for, ternary and quaternary systems containing fatty acid methyl esters (FAME) and fatty acid ethyl esters (FAEE) from castor oil, water, glycerol, methanol and anhydrous ethanol at T = (303.15, 318.15, and 333.15) K. Solubility curves (binodal) were also obtained by the cloud-point method for binary systems containing FAME, FAEE, water, or glycerol. All results obtained can be considered of good quality. The experimental values were correlated using the UNIQUAC model, whose results presented good performance and satisfactory fitting of equilibrium values. © 2013 Elsevier Ltd. All rights reserved.

Moscon J.M.,Federal University of Santa Maria | Priamo W.L.,IFRS Campus Sertao | Silva J.R.F.,Federal University of Santa Maria | Collazzo G.C.,Federal University of Santa Maria | And 4 more authors.
Global Nest Journal | Year: 2015

The main objective of this study was to evaluate the hydrolysis of rice hulls to obtain reducing sugars by conventional and ultrasound-assisted acid hydrolysis. For this purpose, the methodology of experimental design was used to evaluating the influence of temperature, moisture content and concentration of phosphoric acid on the yield of reducing sugars. The yields at optimized conditions were of 141.1 and 162.0 g.kg-1, for conventional and ultrasound-assisted hydrolysis, respectively. It was possible to obtain high yield using less acid and low temperature, in a manner that ultrasound can be used as a technology for process intensification. © 2015 Global NEST Printed in Greece. All rights reserved.

Silva J.R.F.,URI Integrated Regional University Brazil | Mazutti M.A.,Federal University of Santa Maria | Voll F.A.P.,State University of Maringa | Cardozo-Filho L.,State University of Maringa | And 5 more authors.
Journal of Chemical Thermodynamics | Year: 2013

Reported in this study are (liquid + liquid) equilibrium data for binary, ternary, and quaternary systems formed by fatty acid methyl esters (FAME) and fatty acid ethyl esters (FAEE) of Jatropha curcas oil, water, glycerol, methanol, and ethanol at temperatures of (303.15, 318.15, and 333.15) K. In general, all the systems investigated resulted in good agreement between phase compositions of crunodes of tie-lines, solubility curves (binodal curves) and overall compositions, hence indicating low deviations from mass balance. Experimental results were correlated with the UNIQUAC model, showing low deviations among experimental and calculated values. © 2012 Elsevier Ltd. All rights reserved.

Conte R.,IFRS Campus Sertao | Gullich L.M.D.,IFRS Campus Sertao | Bilibio D.,IFRS Campus Sertao | Zanella O.,IFRS Campus Sertao | And 3 more authors.
Food Chemistry | Year: 2016

This work investigates the extraction process of safflower oil using pressurized ethanol, and compares the chemical composition obtained (in terms of fatty acids) with other extraction techniques. Soxhlet and Ultrasound showed maximum global yield of 36.53% and 30.41%, respectively (70 °C and 240 min). PLE presented maximum global yields of 25.62% (3 mL min−1), 19.94% (2 mL min−1) and 12.37% (1 mL min−1) at 40 °C, 100 bar and 60 min. Palmitic acid showed the lower concentration in all experimental conditions (from 5.70% to 7.17%); Stearic and Linoleic acid presented intermediate concentrations (from 2.93% to 25.09% and 14.09% to 19.06%, respectively); Oleic acid showed higher composition (from 55.12% to 83.26%). Differences between percentages of fatty acids, depending on method were observed. Results may be applied to maximize global yields and select fatty acids, reducing the energetic costs and process time. © 2016 Elsevier Ltd

Filippi D.,IFRS Campus Sertao | Bilibio D.,IFRS Campus Sertao | Bender J.P.,Federal University of Fronteira sul | Carniel N.,URI Integrated Regional University Brazil | Priamo W.L.,IFRS Campus Sertao
Journal of Food Process Engineering | Year: 2015

The main objective of this work was to investigate the extraction kinetics of total polyphenol content (TPC) from pitanga (Eugenia uniflora L.) through conventional maceration with solvent, evaluating the effect of temperature, plant-to-solvent ratio and ethanol percentage. In parallel, the mathematical modeling of experimental data was performed and a model that represents the kinetics profile of extraction with their respective response surface has been proposed. Ultrasound-assisted technology was used to maximize the conditions that promote higher polyphenol content extracted using the conventional method, verifying posteriorly the antioxidant activity of the extract by DPPH (2,2-diphenyl-1-picrylhydrazyl) radical-scavenging assay. The results indicated that based on the regression coefficient (R2), it can be observed that the model predicted satisfactorily the extraction process and the use of ultrasound treatment promoted an increase of about 80.34% in TPC extracted compared with conventional method (from 16.79 to 30.28 mg GAE/g of plant). Extracts enriched with polyphenols showed antioxidant activity up to 48.84% for a concentration of 0.01 g/mL. In general, we concluded that use of ultrasound-assisted technology is important to maximize the amount of total polyphenols extracted and accredits pitanga as a natural antioxidant source for use in food preservation and in human health. Practical Applications This work describes the practical procedures to obtain a new extract from pitanga (Eugenia uniflora L.), which can be used in different segments of food industry, as in bread baking, edible oils and among others. The results presented can guide the improvement of technique and proposes an interesting alternative for partial or full substitution of synthetic ingredients, increasing the quality of food. © 2014 Wiley Periodicals, Inc.

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