Study on Extraction of Volatile Oil from Elaeagnus angustifolia Maxim
Elaeagnus angustifolia is the flower of Elaeagnus angustifolia, which is mainly produced in Northwest China. According to the Chronicle of Chinese Medicine in Ningxia, Elaeagnus angustifolia mainly contains kaempferol, anthocyanin, fat oil and a small amount of volatile oil. It has the function of relieving cough and asthma, and can be used to treat chronic tracheitis.
The extraction method of volatile oil from Elaeagnus angustifolia is usually steam distillation. The characteristics of steam distillation are simple equipment and low cost, but the extraction rate is relatively low, and its process is easy to cause damage to thermal instability and oxidizable components, resulting in low quality products, which will affect the efficacy of drugs and cause losses to enterprises.
Supercritical fluid technology has been widely used in food, medicine, spices and natural pigments. Supercritical CO2 fluid technology as a solvent has the advantages of no pollution, no solvent residue and no damage to the effective components of the volatile oil of Elaeagnus angustifolia, which makes the volatile oil of Elaeagnus angustifolia safe, reliable and of higher value.
Compared with steam distillation, supercritical CO2 extraction has the advantages of less time-consuming, high efficiency and avoidance of pyrolysis and volatilization of volatile oil components. It is suitable for batch production and is convenient for subsequent preparation of preparations. Therefore, it can reduce costs, save time and bring greater economic benefits for enterprises.
Recently, Zhuoer Laboratory has carried out a pilot study on the industrial process of extracting volatile oil from Elaeagnus angustifolia L. by supercritical CO2, and has made some achievements. Zhuoer Laboratory combines supercritical CO2 fluid technology with other technologies and develops a set of technological routes suitable for industrial production of volatile oil from Elaeagnus angustifolia, which effectively improves the quality of volatile oil from Elaeagnus angustifolia and reduces the cost. The extraction process is reasonable, the result is reliable and the repeatability is good, which can provide the basis for the industrialized production of volatile oil from Elaeagnus angustifolia.