| In order to obtain higher content of a -linonenic acid from purple perilla seeds, some extracting parameters affecting the extracting processes of SCE have been studied, such as pressure, temperature, density of CO2 fluid, time of extracting and S/F (SC-CO2/Fraction).
The depth exploitation of ocean resources have a contribution to creating high quantity of living standard for human . It is an example that the health products produced by the extraction of polyenic unsaturated fatty acid such as eicosapentaenoic acid(EPA) and docosahexenoic acid(DHA) from deep sea fish oil become popular all over the world. But they have the weakness of high cost, fishy smell, easily be oxidized and containing cholesterol etc. Comparing with this, a-linonenic acid(LNA) has a special physiological activity, which can be transformed into EPA and DHA by the action of desaturase and lenthened carbon chain enzyme after being absorbed by human body. Thus, we found that a-LNA has the same function to prepare EPA and DHA but it have not weakness of the products from deep sea fish oil. EPA and DHA belong to fatty acid, which are the components constructing the brain cell , Nerve and the blood vessel of human body as well as various hormone, is named “brain gold” and are active factors for the source of human life . Once lacking of it ,some diseases will most probably touch you such as the disorder of organism metabolism, the variation of life mechanism, delay or stop of our physical development, decrease of intelligence or eyesight , bringing decrepitude forward, diseases of heart-brain blood vessel, cancer and senile dementia. Purple perilla oil extracted from its seeds is an excellent health oil, which abounds in linolenic acid, 11,14-octadecadienoic acid and palmic acid etc, the content of unsaturated fatty acid reaches over 90%, among which the content of a-LNA reaches 50~ 63%. Purple perilla oil has the following medical health functions:
(1) increasing the functions of nerve system, benefiting mentality, improving both the ability of memory and the function of sight nerve and eyesight;
(2) preventing decrepitude and senile dementia;
(3)decreasing blood fat, preventing and curing artery porridgy cirrhosis ;
(4)avoiding the condensation of blood platelets, diminishing the chance of forming the blood bolts, avoiding cardiac infarction and brain infraction;
(5)improving the immunity function, functioning as defending the allergic diseases, controlling the growth of tumor and anti-cancer;
(6) keeping the balance of the of fat, improving the situation of physical metabolism, functioning as the decrease of weight and body fat.
Gansu Province, in western China, is a abundant area for generating a plant called purple perilla, especially in Qing Yang District. Despite its natural productivity of dozens of thousands of tons, for years it has been exporting with a humble as a result and not been shifting from its advantage in natural source to its potential advantage in high additional worth. Given that lacking of the ocean resources as an in-land province, they can use the technology of SCE to extract purple perilla oil from its seeds. The purple perilla oil can be regarded as quasi product of EPA and DHA, which equals to “plant brain gold”, besides its advantage of resources, the effect of purple perilla oil is same or better than that of products of deep sea fish oil and its price is lower, hence it has a wide market prospect. We studied the technology extracting essence oil from the purple perilla seeds by supercritical fluids, the emphasis is to look for the optimum technological conditions.
The effects of technological condition on the extraction ratio of essence oil from purple perilla seeds and the calculation of extraction rate are important. The various factors affecting the extraction ratio have been studied.
The effects of technological parameters on the extraction ratio of essence oil extracted from purple perilla seeds have been studied, the optimum technological conditions have been obtained. The extracting pressure, temperature and amount of CO2 fluid are very important factors affecting the efficiency of extraction. In general, the efficiency of extraction of essence oil increases with the increase of pressure. The higher temperature is of benefit to extract the essence oil from purple perilla seeds under the optimum pressure. Extracting time and the value of S/F must be considered, which can be controlled by different way according to the difference of extracted equipments.
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