Author
V. Louli
Bio: V. Louli is an academic researcher from National Technical University of Athens. The author has contributed to research in topics: Extraction (chemistry) & Supercritical fluid extraction. The author has an hindex of 6, co-authored 7 publications receiving 602 citations.
Papers
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TL;DR: It was proved that both the ethyl acetate extracts and those treated with SC CO(2) had antioxidant activity comparable to that of antioxidants commonly used in industry, that is butylhydroxytoluene (BHT), a synthetic antioxidant, and Rosemary extract, a widely known natural one.
248 citations
TL;DR: In this paper, the supercritical fluid extraction of oil from milled celery seeds, using CO2 as a solvent, was examined in a series of experiments and the results indicated a significant increase in extraction rate with increase of pressure or decrease of the particle size of celery seed.
Abstract: The supercritical fluid extraction of oil from milled celery seeds, using CO2 as a solvent, is presented in this study. The effect of the process parameters — pressure and temperature of extraction, particle size of celery seeds and flow rate of CO2 — on the extraction rate was examined in a series of experiments. The results indicated a significant increase in extraction rate with increase of pressure or decrease of the particle size of celery seed. A similar effect was observed with the increase of the solvent flow rate and decrease of temperature. The experimental data were described by an empirical model and two mass balance models: (1) a simplified model, which takes into account only the time dependence of the extract concentration in the two phases and is coupled with various equilibrium relationships, and (2) an extended Lack's model. The correlation results were satisfactory especially for the mass balance models, which account for the double regime — solubility and diffusion controlled regimes — of the extraction.
148 citations
TL;DR: Parsley seed oil extraction with supercritical carbon dioxide at pressures of 10 and 15 MPa, temperatures of 308 and 318 K, flow rates of 0.7, 1.1 and 2 kg/h and mean particle sizes of 293 and 495μm was investigated in a bench-scale apparatus as discussed by the authors.
Abstract: Parsley seed oil extraction with supercritical carbon dioxide at pressures of 10 and 15 MPa, temperatures of 308 and 318 K, flow rates of 0.7, 1.1 and 2 kg/h and mean particle sizes of 293 and 495 μm was investigated in a bench-scale apparatus. For the correlation of the experimental data, a mass balance model coupled with various assumptions—including those of the Lack’s plug flow model—was employed. Comparison of the results demonstrated that best fit is obtained when the model takes into account the equilibrium as well as the mass transfer phenomena, that control the extraction process.
95 citations
TL;DR: In this paper, the effect of process parameters, namely pressure (90, 100, 150, bar), temperature (40, 50,°C), and solvent flow rate (1.1, 2, 3, kg/h), on the extraction rate was examined in a series of experiments conducted in a bench scale apparatus.
91 citations
TL;DR: In this article, a cubic equation of state (EoS) is extended to polymers by using a single set of energy (a ) and co-volume (b ) parameters per polymer fitted to experimental volume data.
43 citations
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TL;DR: Information is provided on the most recent developments in the chemical investigation of polyphenols emphasising the extraction, separation and analysis of these compounds by chromatographic and spectral techniques.
1,186 citations
TL;DR: In this article, the authors provide an updated overview on the principal applications of two clean processes, supercritical fluid extraction and subcritical water extraction, used to isolate natural products from different raw materials, such as plants, food by-products, algae and microalgae.
1,090 citations
TL;DR: Supercritical extraction and fractionation of natural matter is one of the early and most studied applications in the field of supercritical fluids in the last 10 years, studies on the extraction of classical compounds like essential and seed oils from various sources, with or without the addition of a co-solvent have been published.
Abstract: Supercritical extraction and fractionation of natural matter is one of the early and most studied applications in the field of supercritical fluids In the last 10 years, studies on the extraction of classical compounds like essential and seed oils from various sources: seeds, fruits, leaves, flowers, rhizomes, etc, with or without the addition of a co-solvent have been published Supercritical extraction of antioxidants, pharmaceuticals, colouring matters, and pesticides has also been studied The separation of liquid mixtures and the antisolvent extraction are other processes that can perform very interesting separations Mathematical modelling has also been developed and refined for some of these processes The objective of this review is to critically analyze traditional and new directions in the research on natural matter separation by supercritical fluids extraction and fractionation
1,003 citations
TL;DR: In this paper, the effect of solvent and extraction time on the yield of extracted antioxidants from grape, black and red currant by-products (marc) was investigated, and the highest antioxidant activity was found in extracts made from black currant marc, the lowest was in extracts from Red currant MARC.
756 citations
TL;DR: It is shown that a number of factors influence extraction yields, these being solubility of the solute in the fluid, diffusion through the matrix and collection process, and possibility of manipulating the composition of the extract.
573 citations