International audienceHydrofluoroalkenes, like hexafluoropropylene, can be considered as new fluids for refrigeration systems, and consequently volumetric and critical property data are required. In this study a vibrating-tube densitometer technique was used to determine densities at 10 different temperatures between (263 and 362) K and pressures between (0.0009 and 10) MPa. The experimental uncertainties are ( 0.0005 MPa for pressure, ( 0.02 K for the temperature, and ( 0.05 % for vapor and liquid densities. Critical properties have been determined by direct measurement and utilization of experimental densities considering scaling laws. The Wagner, Span and Wagner, Peng-Robinson, and translated Peng-Robinson equations of state are used to correlate the data

Essential oils are of paramount importance in pharmaceutical, cosmetic, agricultural, and food areas thanks to their crucial properties. However, stability and bioactivity determine the effectiveness of essential oils. Polymeric nanoencapsulation is a well-established approach for the preservation of essential oils. It offers a plethora of benefits, including improved water solubility, effective protection against degradation, prevention of volatile components evaporation and controlled and targeted release. Among the several techniques used for the design of polymeric nanoparticles, nanoprecipitation has attracted great attention. This review focuses on the most outstanding contributions of nanotechnology in essential oils encapsulation via nanoprecipitation method. We emphasize the chemical composition of essential oils, the principle of polymeric nanoparticle preparation, the physicochemical properties of essential oils loaded nanoparticles and their current applications.

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International audienceThe present study deals with the determination of optimal values of operating parameters such as temperature and pressure leading to the best yield of a supercritical CO2 extraction of essential oil from local rosemary plants, using the response surface methodology (RSM). The maximum of essential oil recovery percentage relative to the initial mass of leaf powder was 3.52 wt%, and was obtained at 313 K and 22 MPa. A second-order polynomial was used to express the oil recovery and the calculated mass of recovered oil using the RSM was very close to the experimental value, confirming the reliability of this technique. The chemical composition of the Algerian rosemary oil under the obtained optimal conditions (313 K and 22 MPa), determined by GC-MS analysis, revealed the presence of camphor (major compound) (52.12%), 1,8-cineole (9.65%), camphene (7.55%), alpha-pinene (6.05%), borneol (3.52%), aroma dendrene (2.11%), verbenone (1.97%), alpha-caryophyllene (1.71%), and others. (C) 2016 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved

An experimental extraction of Algerian date stones oil was carried out using supercritical carbon dioxide. Response surface methodology was used to investigate the effect of pressure (150–250 bar), temperature (313–333 K) and particles diameter (0.3–0.9 mm) on the extraction yield. The comparison of the predicted results with the experimental values confirmed the reliability of this technique. The optimum yield value was determined around 14.26% and was obtained at a pressure of 250 bar, a temperature of 333 K and particles diameter of 0.3 mm. the conventional solvent extraction using Soxhlet apparatus shows that the oil content of the date stones sample was about 16.22%. The fatty acids composition was determined using GC‐FID analysis, showing that the oleic acid was the major compound present in this oil. Practical applications Locally date stones are an abundant waste product of date processing industries which are rich in many valuables substances such as carbohydrates, oil, dietary fibers, vitamins, proteins, bioactive polyphenols and natural antioxidants, making them an attractive source for the extraction of bioactive compounds because of their low cost and high nutrient content. They can be used in many applications like the production of caffeine‐free coffee, food products formulation, cosmetics, and functional and medicinal supplements. They are a by‐product that can be easily collected and recycled in an economic and sustainable way. Also date stones oil is a great source of saturated, monounsaturated and polyunsaturated fatty acid acids which have several good human health benefits. The use of supercritical carbon dioxide extraction of date stones oil can be regarded as a great opportunity to develop the production of high quality date stones oil and exploit all the mentioned important properties.

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Aim: To synthesize and examine the impact of free Eudragit® RS 100 nanoparticles (LN01), Quantum dots curcumin-loaded Eudragit RS 100 nanoparticles (LN04), and un-encapsulated curcumin nanoparticles (LN06) on cancerous and bacterial cells. Materials & methods: The LN01, LN04, LN06 were synthesized and characterized by Fourier transform infrared, ζ potential, UV–Vis spectroscopy, transmission electron microscopy and scanning electron microscopy and their biological activities were evaluated. Results: LN04 profoundly inhibited the growth of colon (HCT-116) cancerous cells (10.64% cell viability) and breast cancer (MCF-7) cells (10.32% cell viability) with compared to LN01 and LN06. Normal cells (HEK-293) did not show any inhibition after treatments. In addition, LN04 show better inhibitory action on bacterial growth compared with LN01 and LN06. Conclusion: We suggest that LN04 selectively target cancerous and bacterial cells and therefore possess potential anticancer and antibacterial capabilities.