Method for extracting essential oil in traditional Chinese medicinal materials

Abstract

The invention provides a method for extracting essential oil in traditional Chinese medicinal materials. The method provided by the invention has the following beneficial effects: a novel green binaryand ternary deep eutectic solvent is adopted as an extracting agent, the problem that an organic reagent with higher toxicity is used as an extraction solvent in a traditional essential oil extraction technology is overcome, and pollution to the environment is reduced; a combination of the novel green solvent and a microwave-assisted steam distillation technology is used for the first time, the shortcomings of high costs, long extraction time, high labor intensity and the like existing in the traditional extraction technology are overcome, and compared with a method using a binary deep eutectic solvent, a method using a ternary deep eutectic solvent can obtain a higher yield of the essential oil; compared with extraction technologies of microwave steam distillation and ultrasound-assistedternary deep eutectic solvent steam distillation, the ternary deep eutectic solvent combined with microwave-assisted steam distillation extraction method can obtain a higher yield of the essential oil and volatile components; an extraction device is easy to clean to reduce residues of a sample and a solvent; and the method can be combined with the practice to provide a novel means for extractionof the plant essential oil.

Description

(1) Technical field [0001] The invention relates to a method for extracting essential oils in Chinese medicinal materials, in particular to a method for extracting essential oils in Chinese medicinal materials with a novel green solvent combined with microwave-assisted steam distillation. (2) Background technology [0002] Essential oils, which are secondary metabolites in plants, are oily substances with volatile and aromatic odors. The traditional extraction methods of essential oils mainly include: pressing method, solvent extraction method, steam distillation method, and simultaneous distillation extraction method. Pressing is the oldest way to obtain essential oils. The process does not require heating and is easy to operate. However, the obtained essential oils often contain impurities such as mucus, and it is difficult to completely extract the volatile oils in plants. Solvent extraction is by far the easiest way to obtain essential oils, but its extraction efficienc...

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At the same time, after the morphology of the extracted residue was analyzed by scanning electron microsc

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