scispace - formally typeset
Search or ask a question
Author

Cristina G. Grigoras

Other affiliations: University of Rennes
Bio: Cristina G. Grigoras is an academic researcher from University of Orléans. The author has contributed to research in topics: Medicine & Aqueous solution. The author has an hindex of 5, co-authored 8 publications receiving 212 citations. Previous affiliations of Cristina G. Grigoras include University of Rennes.

Papers
More filters
Journal ArticleDOI
TL;DR: Pomaces of four different apple cultivars (Gala v. Tenroy, Golden v. Golden, Granny Smith, and Pink Lady v. Cripps Pink) were submitted to microwave assisted extraction with various solvents (MeOH/H2O mixture, ethanol and ethyl acetate) to recover their bioactive compounds as discussed by the authors.

91 citations

Journal ArticleDOI
TL;DR: The supercritical fluid chromatography/evaporative light scattering detector (SFC/ELSD) coupling provides high resolution, fast analysis and higher responses for the analysis of triterpenoids and an attempt to identify some compounds was done by collecting chromatographic peaks and further analyzing them with mass spectrometry.

71 citations

Journal ArticleDOI
TL;DR: In this article, a solvent free microwave assisted extraction method was developed for extracting anthocyanins from sweet cherries using only four irradiation cycles of 45 seconds each at a power of 1000 W.

43 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of some fundamental operating parameters in heterogeneous photocatalysis were investigated in order to determine the main ones affecting the degradation kinetics of carbamazepine (CBZ).
Abstract: The present work systematically investigates the photocatalytic degradation of carbamazepine (CBZ), an organic compound, known as refractory to the conventional wastewater treatment by the titanium dioxide PC 500 catalyst. The effects of some fundamental operating parameters in heterogeneous photocatalysis were investigated in this work in order to determine the main ones affecting the degradation kinetics. The obtained results clearly showed that the removal rate of the target compound is strongly influenced by the initial concentration of the pollutant. The degradation reaction rate increases when the concentration of CBZ decreases due to a lower OH/CBZ ratio. On the other hand, it was shown that during the first 30 minutes the reaction of photocatalytic degradation follows a first order kinetic and also that when the incident light flux increases, the photocatalytic degradation process is accelerated due to the increases of the catalyst excitation probability with sufficient photon energy. A relatively high CBZ removal yield (of about 87%) was obtained for an initial pollutant concentration of 2 mg/L and an irradiation time of 150 min. A total organic carbon (TOC) reduction of about 74% was observed confirming the mineralization of the parent compound under UV light conditions. As expected, it was observed that the effect of TiO2 concentration on the degradation kinetics was significant confirming the positive influence of the increased number of TiO2 active sites on the process. Finally, the Langmuir-Hinshelwood (L-H) model was successfully used to fit the experimental results and the L-H model constants were also calculated.

18 citations

Journal ArticleDOI
TL;DR: In this paper, the possibility of direct valorization of whey as fertilizer was investigated, and experiments were carried out on three species of plants: broccoli (Brassica oleracea L., var botrytis, subvar. cymosa), wheat (Triticum aestivum L.) and soy (Glicine max (L) Merr).
Abstract: In the present paper, the possibility of direct valorization of whey as fertilizer was investigated. For this study, the experiments were carried out on three species of plants: broccoli (Brassica oleracea L., var botrytis, subvar. cymosa), wheat (Triticum aestivum L.) and soy (Glicine max (L) Merr). The germination capacity of seeds, the pot development phase and the accumulation of the fresh and dry biomass were analyzed. The results obtained in the case of the three studied species suggested the positive effect of whey addition during cultivation. The extraction of plant material was carried out by both classical methods and under microwaves. The preliminary results of thin layer chromatography (TLC) and UV-VIS spectroscopy analyses of the extracts confirmed the positive influence of whey on plants development, encouraging further research.

13 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: This paper is a review of the main features of SFC, focusing essentially on achiral separations, but several fundamental aspects discussed here are also relevant to chiral SFC separations.

326 citations

Journal ArticleDOI
TL;DR: The valorization of inexpensive, abundantly available, and renewable biomass waste could provide significant benefits in response to increasing fossil fuel demands and manufacturing costs, as well as emerging environmental concerns.

214 citations

Journal ArticleDOI
TL;DR: It can be concluded that FVW management can be carried out following different processing routes, though nowadays the best solution is to find an adequate balance between conventional waste management methods and some emerging valorization technologies.

197 citations

Journal ArticleDOI
TL;DR: In this article, the authors present an overview on solvent-free microwave-extraction techniques of bioactive compounds from natural products based on the concept of green analytical chemistry, which has proved to be an alternative to other techniques with the advantages of reducing extraction times, energy consumption, solvent use and CO 2 emissions.
Abstract: We present an overview on solvent-free microwave-extraction techniques of bioactive compounds from natural products. This new technique is based on the concept of green analytical chemistry. It has proved to be an alternative to other techniques with the advantages of reducing extraction times, energy consumption, solvent use and CO 2 emissions.

186 citations

Journal ArticleDOI
TL;DR: In this paper, microwave assisted water extraction, either adding water as the only solvent or in solvent free processes, using the naturally present water in vegetal materials for the extraction of valuable components from renewable vegetal sources is highlighted and the potential of this technique for industrial applications is discussed.
Abstract: The development of environmentally friendly processes with limited generation of polluting streams to attain sustainable utilization of raw materials is encouraged. The implementation of novel extraction technologies more efficient, selective and with lower energy consumption than conventional ones, can help in achieving this objective. Particularly promising are aqueous based methods, since water is a cheap, safe and abundant solvent and the limited use of toxic organic solvents is a consumer's, ecological and processing demand. The benefits and the limiting aspects of microwave assisted water extraction, either adding water as the only solvent or in solvent free processes, using the naturally present water in vegetal materials for the extraction of valuable components from renewable vegetal sources are highlighted and the potential of this technique for industrial applications is discussed. © 2014 Society of Chemical Industry

155 citations