Extraction of Natural Pigments by Supercritical Fluid Extraction Equipment
2018-03-08 09:57:54 From: Tradematt-Aerogel
Supercritical fluid extraction is the extraction process using fluids above the critical temperature and critical pressure as the solvent. The fluid near the critical point not only has a very high solubility of the substance, but also the solubility of the substance varies with the pressure or the temperature of the system, so that the selective extraction of the separated substance can be easily carried out by adjusting the pressure or the temperature of the system .
The application of supercritical fluid extraction in food, at present, supercritical fluid extraction has been widely used in oil, cholesterol, flavors and fragrances and pigment extraction separation.
Supercritical fluid extraction In food processing, almost all use of CO2 as an extractant. CO2 is not only a strong solvent, it can extract a wide range of compounds in food processing, and relatively stable, inexpensive, non-toxic, non-flammable, and can be recycled. CO2 preparation costs low, available high purity gas, no residue. The lower critical point of CO2, the criticality of 31.1 ℃, the critical pressure of 7.38MPa, it is particularly suitable for extraction of volatile and heat-sensitive substances. Compared with the traditional solvents n-hexane, methylene chloride, has significant advantages.
The properties of supercritical CO2 are similar to those of n-hexane and are therefore particularly suitable for the extraction of lipophilic components. Such as β-carotene, capsanthin, cigarette fat orange, lutein and so on. In addition, by using different entrainers, the polarity of CO2 can be changed, so that the extraction range can be expanded, and more polar pigments such as tea polyphenols and ginkgo flavone can be extracted.
In the past, carotenoids were extracted mainly using organic solvents such as n-hexane, which not only consumed a large amount of solvents, but also eliminated all solvents and avoided the toxicity caused by residual solvents. Supercritical CO2 extraction can replace the traditional solvent method, effectively extract carotene. Extracting Carotene from Seaweed by Supercritical Carbon Dioxide. With acetone as entrainer, can improve the extraction rate.
Supercritical fluid extraction is a new emerging extraction and separation technology in the food industry. Compared with the traditional chemical solvent extraction method, its superiority is no chemical solvent consumption and residue, no pollution, to avoid the thermal degradation of the extract at high temperatures, to protect the activity of physiologically active substances and to maintain the natural flavor of the extract.
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