Application of Supercritical CO2 Fluid Extraction in Natural Extracts and Essential Oils
Based on the numerous advantages of supercritical CO2fluid extraction, it has been increasingly used in the extraction and separation of natural flavors and essential oils.
Different parts of natural plants contain different characteristics in their chemical composition. In general, flowers, fruits, roots and rhizomes contain aromatic essential oils; stems, skins, leaves, etc. contain pigments, pectin substances are relatively high, relatively few volatile components; fruit, seed higher fatty acids and oil content relative higher. When using supercritical CO2fluid extraction technology to extract plants, the extraction of roots, roots, stems, husks, and fruits is generally easier to handle and has more potential for application. On the one hand, their bulk density is relatively large (usually around 0.5g/cm3), the relative content of active ingredients is relatively high, and their selectivity is easily regulated. Many different properties and uses can be obtained by general analytical methods or combined distillation. Products; on the other hand, the extract contains less viscous components, which is less likely to contaminate and block the gas path. After the extraction, the equipment is easily cleaned and the actual production costs are reduced. The advantages of these two aspects make it more competitive than traditional methods.
The supercritical CO2fluid has a lipophilic nature and has good solubility to low polar substances such as aromatic substances and essential oils. The entire extraction and separation process is carried out at low temperature and high pressure, without chemical reaction, no solvent residue, and maximum retention The original fragrance, color, and activity of the ingredients are actually a physical gas-liquid separation process, which is particularly suitable for the separation and purification of unstable natural products and physiologically active substances, and is in line with international trends in natural health. Supercritical CO2has become one of the most effective techniques for obtaining high quality natural extracts and essential oils. Especially in the application of natural fragrances and essential oils has become the most successful field of industrialization of supercritical CO2technology.