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Study on Supercritical CO2 Extraction of Thyme


The extract from Thymus quinpuecostatus was obtained by supercritical carbon dioxide extraction (SFE-CO2) technique. Suitable technological conditionswereobtained. Theantioxidationeffects of thethymeextractwere also investigated in this experiment. The results showed that thyme oil has strong antioxidant actions in soybean oil. And it does not bring any bad effects on soybean oil favor.


Thyme, also known as thyme, is a perennial deciduous shrub of the labiatae family.

Widely distributed in northern Africa and the European cold and drought resistance, the vitality is very tenacious.

It is widely distributed in low-lying hilly areas in Liaoning, Shandong, Hebei, Shanxi, and Shaanxi provinces.

In 1970, the International Standard Organization announced that thyme can be used as a food spice. Many European countries often use thyme as one of the important raw materials for blending spices. However, the research on thyme is far from widely used. Development and utilization have not received due attention.

Thyme essential oil is usually obtained by steam distillation method and oil-water separation process. The yield of thyme essential oil obtained by steam distillation is too low and the cost is too high, thus limiting its production and use.

In this experiment, thyme from Gansu was used as a raw material, and thyme essential oil was extracted by supercritical CO 2 extraction (SFE-CO2). The extraction process conditions were studied, and the best experimental conditions were screened to obtain higher yields of essential oils.

Studies have reported that flavonoids in thyme plant extracts have the ability to scavenge free radicals and have a strong inhibitory effect on the oxidation of methyl linoleate systems.

Therefore, the antioxidant activity of thyme extract in soybean oil was researched in different ways to provide theoretical basis and practical parameters for further development of the use of essential oils as natural antioxidants.

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