University of Avignon

About: University of Avignon is a education organization based out in Avignon, Provence-Alpes-Côte-d'Azur, France. It is known for research contribution in the topics: Population & Speaker recognition. The organization has 1526 authors who have published 3766 publications receiving 88928 citations.

Relocation optimization of electric cars in one-way car-sharing systems: modeling, exact solving and heuristics algorithms

Abstract: Car-sharing system with electric cars is a very convenient service for urban transportation: it allows users to pick up a vehicle at a station and rent it during a short time. To manage this kind o...

Extraction of α-mangostin from Garcinia mangostana L. using alternative solvents: Computational predictive and experimental studies

Abstract: This study evaluated the performance of alternative green solvents, ie d -limonene, dimethylcarbonate (DMC), ethanol, ethyl acetate, ethyl lactate and methyltetrahydrofuran (MeTHF) compared to the petroleum based dichloromethane, for extraction of α-mangostin from Garcinia mangostana pericarps The Hansen solubility parameters (HSPs) were used to explain the dissolution behavior of the solutes and solvents, and the conductor-like screening model for realistic solvation The (COSMO-RS), a statistical thermodynamic approach based on the results of quantum chemical calculations for comprehending the dissolving mechanisms were used to predict the extraction prediction On the basis of the Hansen analysis, dichloromethane was the most suitable solvent for extraction of α-mangostin However, COSMO-RS analysis showed a higher solubility of α-mangostin in ethyl lactate, DMC, MeTHF, ethyl acetate and ethanol Moreover, the experimental studies using a classical reflux extraction followed by a quantitative HPLC analysis of α-mangostin showed similar results to the predictive values from the COSMO-RS model The α-mangostin levels extracted by ethyl lactate, DMC, MeTHF, ethyl acetate and ethanol were higher than those using dichloromethane and d -limonene The results support the potential use of ethyl lactate, DMC, MeTHF, and ethanol as alternative green solvents for the preparation of α-mangostin extracts

Experimental approach versus COSMO-RS assisted solvent screening for predicting the solubility of rapeseed oil

Abstract: Vegetable oils take a large part in industry for food and non-food applications. However the extraction process of oil from oilseeds includes a solvent extraction step using hexane. Despite its various advantages it presents numerous drawbacks; it is sourced from petroleum, it has a high flammability and it appears to be dangerous for health and environment (CMR2). This study presents a theoretical screening using COSMO-RS simulations of the relative solubility of vegetable oil constituents regarding several bio-based solvents as well as an experimental screening of the efficiency of these solvents. The aim is to correlate simulations and experiments and give a preliminary evaluation for the substitution of hexane by bio-based solvents for the extraction of vegetable oils. Differences between theory and practice have been noticed for several solvents such as terpenes that appeared to be good candidates in theory and that were in fact the solvents that gave the lowest extraction yield.