50 research outputs found
Ultrasound-assisted green solvent extraction of high-added value compounds from microalgae Nannochloropsis spp.
The aim of this work was to investigate ultrasound (US)-assisted green solvent extraction of valuable
compounds from the microalgae Nannochloropsis spp. Individual green solvents (water, ethanol (EtOH),
dimethyl sulfoxide (DMSO)) and binary mixture of solvents (water-DMSO and water-EtOH) were used
for the extraction procedures. Maximum total phenolic compounds yield (Yp 0.33) was obtained after
US pre-treatment (W = 400 W, 15 min), being almost 5-folds higher compared to that found for the
untreated samples and aqueous extraction (Yp 0.06). The highest yield of total chlorophylls
(Yc 0.043) was obtained after US (W = 400 W, 7.5 min), being more than 9-folds higher than those
obtained for the untreated samples and aqueous extraction (Yc 0.004). The recovery efficiency
decreased as DMSO > EtOH > H2O. The optimal conditions to recover phenolic compounds and chlorophylls
from microalgae were obtained after US pre-treatment (400 W, 5 min), binary mixtures of solvents
(water-DMSO and water-EtOH) at 25–30%, and microalgae concentration of 10%
Valorization of Moroccan olive stones by using it in particleboard panels
The main objective of this work was to find new applications to valorize olive stones (endocarp and seed). In order to improve knowledge on olive stones, the phenolic compounds concentration of three varieties of Moroccan olive trees: Moroccan Picholine, Menara and Haouzian were studied. Olive stones of three varieties were characterized by Fourier Transform Mid Infrared Spectroscopy (FT-MIR). Total phenolic compounds are quantified after solid-liquid extraction by an assay of Folin-Ciocalteu. Moroccan Picholine stones (11.32 mg GAE/g DM) have a higher content of total phenolic compounds than Haouzia stones (4.55 mg GAE/g DM) and Menara stones (3.56 mg GAE/g DM). Thermogravimetric analysis indicates that up to 195 degrees C; there is no degradation of the stones. The biocide performance on agar-agar was tested with decay fungi. Biodegradation studies show that the most interesting results are obtained with Moroccan Picholine stones. The presence of Moroccan Picholine in a particleboard panels improves the total resistance of the particleboard panels against both Coriolus versicolor and Coniophora puteana rot fungi
Valorization of moroccan olive stones by using it in particleboard panels
The main objective of this work was to find new applications to valorize olive stones (endocarp and seed). In order to improve knowledge on olive stones, the phenolic compounds concentration of three varieties of Moroccan olive trees: Moroccan Picholine, Menara and Haouzian were studied. Olive stones of three varieties were characterized by Fourier Transform Mid Infrared Spectroscopy (FT-MIR). Total phenolic compounds are quantifi ed aft er solid-liquid extraction by an assay of Folin-Ciocalteu. Moroccan Picholine stones (11.32 mg GAE/g DM) have a higher content of total phenolic compounds than Haouzia stones (4.55 mg GAE/g DM) and Menara stones (3.56 mg GAE/g DM). Thermogravimetric analysis indicates that up to 195°C; there is no degradation of the stones. The biocide performance on agar-agar was tested with decay fungi. Biodegradation studies show that the most interesting results are obtained with Moroccan Picholine stones. The presence of Moroccan Picholine in a particleboard panels improves the total resistance of the particleboard panels against both Coriolus versicolor and Coniophora puteana rot fungi
High Voltage Electrical Discharges (HVED) application on Grape Seeds suspensions: effect of the generated shock wave and vapor bubble on Polyphenol Extraction
International audienc
High Voltage Electrical Discharges (HVED) application on Grape Seeds suspensions: effect of the generated shock wave and vapor bubble on Polyphenol Extraction
International audienc
A comparative analysis of two different imaging systems to study the urinary stone characteristics
380 A comparative analysis of two different imaging systems to study the urinary stone characteristics
Study of the electrical and chemical mechanisms induced by high voltage electrical discharges and application to biomolecules extraction, ECCE10-ECAB3-EPIC5
International audienc