Extraction, separation and isolation of essential oils from natural matrices by supercritical CO₂

Abstract

Dried and ground leaves of different plants from Sardinia (Italy), such as Inula viscosa (L.) Aiton and Inula graveolens (L.) Desf., were used for supercritical extraction with carbon dioxide (CO 2 ) to isolate the corresponding extracts. The vegetable fragrances were isolated from the supercritical extract by means of a fractional separation technique. GC-MS analysis of the extracts allowed identification of the oil constituents. The process was carried out operating at 90 bar and 50°C in the extraction vessel, at 90 bar and below −5°C in the first separator to selectively precipitate the cuticular waxes, and at a pressure of 15-20 bar and temperatures in the range 15-21°C in the second vessel to recover the volatile oil. The hydrodistilled oils showed some important differences. Copyright

Supercritical Fluid Extraction of Plant Flavors and Fragrances

“…SFE of flavors, fragrances and other natural products has been reviewed. These reviews have described a wide range of applications for the extraction of several groups of non-polar compounds, including essential oils, other flavor and fragrance compounds, medicinal compounds, lipids, carotenes and alkaloids, tocopherols and tocotrienols, as well as the global yield and quality of the extracts all of the plant materials investigated, and the possibility of their application in the food, cosmetics and pharmaceutical industries [4,7,11,[21][22][23][24][25][26][27][28][29][30]. The nature of extracted plant materials, the mathematical modelling of the process, and the choice of the appropriate model have been reviewed too [31].…”

In-Depth Search Focused on Furans, Lactones, Volatile Phenols, and Acetals As Potential Age Markers of Madeira Wines by Comprehensive Two-Dimensional Gas Chromatography with Time-of-Flight Mass Spectrometry Combined with Solid Phase Microextraction

“…The RI values experimentally calculated were compared, when available, with values reported in the literature for similar chromatographic columns that employ as the first dimension the column of this study. [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51] The GC Â GC area data were used as an approach to estimate the relative content of each volatile component.…”

New extraction technique for alkaloids

“…Natural products are extracted by conventional methods such as Soxhlet and room temperature solvent extraction, [1][2][3][4][5][6][7] or by ultrasound, [8][9][10][11][12][13][14] microwaves, [15][16][17][18] supercritical solvents [19][20][21][22][23][24][25][26][27][28][29][30] or other methods. [31][32][33][34] In this paper a new method is developed to extract alkaloids, which are among the most important groups of secondary metabolites.…”