4 Things need to know about investing in supercritical CO2 extracted vegetable oils
At present, the application of supercritical CO2 extraction technology in various aspects is receiving unprecedented attention. It has been proved to have broad prospects in theory and application.
But as a new technology, supercritical CO2 extraction also has its limitations.
First of all, supercritical CO2 extraction technology is more suitable for the extraction of lipophilic and relatively low molecular weight substances, but it has poor extraction efficiency for active ingredients with large polarity or large molecular weight, and it needs to be added Suitable co-solvent.
The co-solvent may remain in the product, which will affect the quality of the product and violate the original intention of using supercritical CO2 extraction technology.
Low content of oil phospholipids
In addition, the oxidation stability of oil extracted by supercritical CO2 is significantly lower than that of oil produced by traditional methods. This is due to the low content of oil phospholipids extracted by SC-CO2. Phospholipids themselves have no antioxidant capacity, but they are anti-oxidant. A significant synergist of the oxidant tocopherol.
However, this shortcoming can be overcome by adding a certain amount of phospholipids to the oil.
Lack of sufficient theoretical research
Secondly, the correct selection and use of co-solvents have a great impact on the extraction effect, which can greatly broaden the application range of supercritical CO2 in the extraction of physiologically active substances.
However, there is still a lack of sufficient theoretical research in the use of the method, and the testability is poor. Rely on experimentation.
Moreover, in the oil extraction and separation, since the chemical structures of various fatty acids are very similar, and the polarity is also equal, the effect of the entrainer can only enhance the extraction capacity of CO2, and the operating pressure of the system can not be changed without changing the polarity of the solvent to improve the selectivity.
Cost is relatively high
In addition, the supercritical CO2 extraction technology faces the problems of large one-time investment such as equipment having to withstand high pressure and good sealing performance during the application process.
Its product cost is relatively high, the penetration rate is low, and it is difficult to scale and commercialize. Because of this, they are restricted and can only choose products with high added value as extraction objects.