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

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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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Extraction of essential oil from Algerian rosemary leaves is carried out by means of a hydro-distillation process. The important operating parameters such as extraction time, condensation flow rate and water/solid plant material ratio, have been investigated. The highest yield value was 1.92% and was obtained for a water/plant ratio, a condensate flowrate, and extraction time of 20, 4.51ml/min and 120 min, respectively. The essential oil components have been identified using the GCMS analysis which show camphor as the major ingredient, followed by camphene, α-pinene and 1,8-cineole. The results have been compared with those obtained using a supercritical carbon dioxide extraction process, which has shown to be more much better quantitatively and qualitatively.

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