Method for extracting peppermint oil

Abstract

The invention discloses a method for extracting peppermint oil, which comprises the following steps: feeding peppermint stem and leaves dried in the shade into an extracting tank, and adding warm water of which the weight is 8 to 10 times that of the peppermint into the extracting tank; adding an acid and alkali modifier, stirring the mixture for 0.5 to 1h, and regulating the PH of the extracting solution to be 4.5 to 5.0; activating cellulase in water of 38 to 40 DEG C for 5 to 10min, and heating the extracting solution in the extracting tank to 40 to 50 DEG C; adding cellulase of which the dry weight is 0.2 to 0.4% of that of peppermint into the extracting solution, and keeping the temperature constant and stirring continuously for 1.5 to 2h; and heating the extracting solution in the extracting tank to boiling, passing distillate through a condenser and then feeding the distillate into an extraction pot, cooling and layering, and obtaining the upper layer, which is the peppermint oil. The peppermint oil extracted by the method is high in yield and content of menthol.

Description

technical field [0001] The invention belongs to the field of agricultural technology, in particular to a method for extracting natural peppermint essential oil. Background technique [0002] Mint is a mint plant of the Labiatae family. It is a widely used Chinese medicinal material and one of the three major spices in the world. The mint crude oil extracted from mint stems and leaves can be processed to obtain menthol and vegetable oil. As a large number of commonly used traditional Chinese medicines, there are as many as 45 kinds of commonly used Chinese patent medicines containing peppermint and its mint oil and menthol recorded in the Pharmacopoeia of the People's Republic of China. Peppermint crude oil, menthol and vegetable oil are widely used in medicine and hygiene, daily chemical industry, and food processing. [0003] The processing of mint crude oil follows the traditional method of artificially "lifting oil", which has a low oil yield and poor oil quality. The m...

AI Technical Summary

Problems solved by technology

[0003] The processing of mint crude oil follows the traditional method of artificial "lifting oil", which has a low oil yield and poor oil quality

The manual workshop oil refining method inherited from history not only wastes energy, manpower, and financial resources, but also because it is difficult to control the heat and temperature, the oil yield is only 0.15-0.20% of the fresh grass, and the quality needs to be improved.