Combined extraction method for rosemary essential oil and rosemary antioxidant

Abstract

The comprehensive process of extracting refined rosemary oil and rosemary antioxidant includes the following steps: circularly extracting rosemary leaf directly with polar organic solvent in 3-20 times rosemary leaf at 20-100 deg.c for 0.08-6 hr to obtain refined rosemary oil and rosemary antioxidant dissolved in the polar organic solvent; circularly extracting the mixture of refined rosemary oil and rosemary antioxidant directly with non-polar organic solvent or weak polar organic solvent in 3-200 times the mixture at 20-100 deg.c for 0.08-6 hr and cooling to 5-30 deg.c to obtain refined rosemary oil dissolved in the non-polar organic solvent or weak polar organic solvent and rosemary antioxidant deposit; filtering to obtain rosemary antioxidant; and distilling the extracted liquid at 20-100 deg.c to eliminate solvent and obtain refined rosemary oil. The said process has short extraction period, high efficiency and low cost.

Description

technical field [0001] The present invention relates to a kind of extracting method of rosemary essential oil and rosemary anti-oxidant, particularly relate to a kind of extracting by polar organic solvent, non-polar or weak polar organic solvent or its mixed solvent circulation extraction of rosemary dry leaf, If necessary, it is assisted by ultrasonic strengthening treatment, and the comprehensive extraction method of rosemary essential oil and rosemary antioxidant can be obtained simultaneously or successively. Background technique [0002] The extraction method of rosemary essential oil mainly uses the traditional steam distillation method, and recently also uses CO 2 Supercritical extraction method. The extraction methods of rosemary antioxidants include: "edible oil extraction method", "organic solvent extraction method", "CO 2 "Supercritical extraction method", "alkaline water extraction method" and "superheated water extraction metho...

AI Technical Summary

Problems solved by technology

"Edible oil extraction method" is to crush rosemary leaves and extract them directly with edible oil at room temperature or under heating, but the speed of filtering and removing residue is slow, and the oil will have a strong rosemary essential oil odor, which is difficult Exhaustion: "Organic solvent extraction" is a kind of extraction method that was used earlier and is economical and applicable. According to the different types of solvents used, the extraction methods and steps are also different; "CO 2 "Supercritical extraction method" has good extraction effect and high product quality, but the scale is small, the equipment is expensive, high-pressure operation, and operating cost are high. Adding a small amount of organic solvent as entrainer or co-solvent to improve the extraction yield or selectivity actually loses the advantage of not using organic solvents; The obtained product has poor appearance, low yield when used alone, and the pH range of the extract must be strictly controlled; the "superheated water extraction method" is only a preliminary research report, and the method has not yet been formed. The extraction device is special and the scale is very small. Not yet valuable for application development

[0003] In the existing "organic solvent extraction method" close to the present invention, it includes extracting rosemary raw materials with ethanol or steamed residual leaves, removing the so