Laura J. Rovetto

Planta Piloto de Ingeniería Química

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Cor J. Peters

Delft University of Technology

Esteban A. Brignole

Planta Piloto de Ingeniería Química

E. Dendy Sloan

Colorado School of Mines

Carolyn A. Koh

Colorado School of Mines

Susana B. Bottini

Consejo Nacional de Investigaciones Científicas y Técnicas

ÁM

Ángel Martín

Universidad de Valladolid

Nikolaos I. Papadimitriou

National Centre of Scientific Research "Demokritos"

Alexis Velez

Consejo Nacional de Investigaciones Científicas y Técnicas

A. K. Stubos

National Centre of Scientific Research "Demokritos"

Louw J. Florusse

Delft University of Technology

Cooperative Institutions

Consejo Nacional de Investigaciones Científicas y Técnicas

Colorado School of Mines

Universidad Nacional de Córdoba

Delft University of Technology

Planta Piloto de Ingeniería Química

Universidad Nacional del Sur

Technical University of Denmark

Centro Científico Tecnológico - Bahía Blanca

Khalifa University of Science and Technology

National Geophysical Research Institute

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Subcritical Fluid Extraction of Antioxidant Phenolic Compounds from Pistachio (Pistacia vera L.) Nuts: Experiments, Modeling, and Optimization

Journal of Food Science (2019)

Romina Bodoira Alexis Velez Laura J. Rovetto Pablo D. Ribotta Damián Maestri

Abstract A process to obtain phenolic compounds with antioxidant properties from pistachio nuts using water/ethanol mixture under high temperature and pressure conditions was carried out. To optimize extraction conditions and antioxidant activity of bioactive compounds, theoretical models were scanned against experimental data. Phenolic profile was dominated by several flavonoids and gallic acid derivatives. A fitted model for phenolic compounds extraction presented a maximum predicted value under the following conditions: 220 °C extraction temperature, 6.5 MPa pressure, and 50% ethanol. Beneath these conditions, phenolic extracts gave the highest radical scavenging capacity, similar to that reached by using commercial antioxidants. A mathematical model, namely two‐site desorption kinetic model, showed to be suitable for the description of extraction kinetics under the optimal operation conditions. Overall, the process described in this study shows a potential alternative method for extraction of pistachio bioactive compounds. Practical Application Pistachio nuts are known to contain a vast array of phenolic and polyphenolic substances having strong antioxidant properties. Currently, the use of natural antioxidants in the food industry has increased, in consequence there is a growing interest in improving the extraction processes using GRAS (general recognize as safe) solvents. This study describes a safe, inexpensive, and short‐time method (subcritical fluid extraction) to obtain antioxidant extracts from defatted pistachio nuts. This type of process may be adapted toward applications at industrial scale.

Pistacia

10.1111/1750-3841.14507

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Citations (23)

Experimental and Computational Investigation of the sII Binary He−THF Hydrate

The Journal of Physical Chemistry B (2011)

Nikolaos I. Papadimitriou Ioannis N. Tsimpanogiannis A. K. Stubos Ángel Martín Laura J. Rovetto

The objective of this work is to study the binary He−THF hydrate with both experimental and theoretical approaches. Experimental data for the hydrate equilibrium at pressures up to 12.6 MPa are reported for the binary He−THF hydrate with stoichiometric THF composition (i.e., 5.56 mol % THF). These data are used to calibrate a thermodynamic model [J. Phys. Chem. C2009, 113, 422] for the prediction of hydrate equilibrium that is based on the van der Waals−Platteeuw statistical thermodynamic theory. Then this model is used to extrapolate the obtained experimental data to much higher pressures, and good agreement is observed with other available experimental data at pressures up to 150 MPa. This model is also capable of estimating the cavity occupancies for He and THF. The results show that the large cavities are completely occupied by THF molecules, whereas the small ones are partially occupied by He atoms. The He occupancy of the small cavities is less than 60%, even at high pressures (100 MPa). The occupancies predicted from this model are in close agreement with similar results from molecular simulations and a previously reported thermodynamic approach.

Clathrate hydrate

Stoichiometry

10.1021/jp105451m

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Citations (33)

Supercritical hydrogenation processes

The Journal of Supercritical Fluids (2003)

Laura J. Rovetto Susana B. Bottini Esteban A. Brignole Cor J. Peters

10.1016/s0896-8446(02)00156-0

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Citations (20)

Experimental pressure versus temperature isochoric - isoplethic curves for systems related to the supercritical hydrogenation of polybutadiene

Andrés E. Ciolino Pablo E. Hegel Juan M. Milanesio Alfonsina E. Andreatta Matías Menossi

Isochoric process

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Is gas hydrate formation thermodynamically promoted by hydrotrope molecules?

Fluid Phase Equilibria (2006)

Laura J. Rovetto Timothy A. Strobel Carolyn A. Koh E. Dendy Sloan

Clathrate hydrate

10.1016/j.fluid.2006.06.018

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Citations (30)

Supercritical carbon dioxide extraction of cannabinoids from Cannabis sativa L.

The Journal of Supercritical Fluids (2017)

Laura J. Rovetto Niccolo V. Aieta

Supercritical Carbon Dioxide

Supercritical fluid extraction

Cannabis sativa

10.1016/j.supflu.2017.03.014

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Citations (133)

Phase‐equilibrium modeling in the hydrogenation of vegetable oils and derivatives

Journal of the American Oil Chemists Society (2006)

Selva Pereda Laura J. Rovetto Susana B. Bottini Esteban A. Brignole

Abstract The main tool needed to carry out phase‐equilibrium engineering of a given process is an adequate thermodynamic model adjusted to the range of process operating conditions of the working system. In the present work the Group Contribution with Association Equation of State (GCA‐EoS) is used to model the phase behavior of reacting mixtures typical of the hydrogenation of vegetable oils and derivatives at supercritical or high‐pressure conditions.

Vegetable oil

10.1007/s11746-006-1227-6

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Citations (12)

Supercritical hydrogenolysis of fatty acid methyl esters: Phase equilibrium measurements on selected binary and ternary systems

The Journal of Supercritical Fluids (2005)

Laura J. Rovetto Susana B. Bottini Esteban A. Brignole Cor J. Peters

Hydrogenolysis

Propane

10.1016/j.supflu.2005.02.006

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Citations (17)

Dissociation studies of CH4–C2H6 and CH4–CO2 binary gas hydrates

Fluid Phase Equilibria (2007)

Laura J. Rovetto Kristen E. Bowler Laura L. Stadterman Steven F. Dec Carolyn A. Koh

Clathrate hydrate

Gas composition

10.1016/j.fluid.2007.08.003

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Citations (29)

NMR studies on CH4+CO2 binary gas hydrates dissociation behavior

Laura J. Rovetto Steven F. Dec Carolyn A. Koh E. Dendy Sloan

The dissociation behavior of the CH4+CO2 binary gas hydrate has been investigated using Nuclear Magnetic Resonance (NMR) spectroscopy. This technique allows us to distinguish the hydrate structure present, as well as to quantify phase concentrations. Single-pulse excitation was used in combination with magic-angle spinning (MAS). Time-resolved in situ decomposition experiments were carried out at different compositions in sealed, pressurized samples. The decomposition profiles of the CH4+CO2 binary gas hydrate system obtained at various compositions suggest that the decomposition rate is a strong function of the fractional cage occupancy and temperature. An unexpected CH4 hydrate reformation was observed during our decomposition experiments when the temperature reached the ice melting point. A decrease on the CO2 content in the hydrate phase was found during the decomposition experiment, as the pressure and temperature of the system increases.

Clathrate hydrate

Magic angle spinning

10.14288/1.0041032

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Citations (5)