Method for extracting lipid-soluble and water-soluble antioxidant from rosemary

Abstract

The invention provides a method for extracting lipid-soluble and water-soluble antioxidants from rosemary. The method comprises the following steps: (1) naturally drying in harvested tender stems and leaves of rosemary in shadow places; (2) distilling the naturally dried rosemary by using steam, thereby obtaining rosemary essential oil and residues; (3) crushing the residues obtained after the essential oil is extracted, adding an ethanol solution with certain concentration, performing ultrasonic auxiliary extraction for multiple times, andperforming centrifugal separation after extraction, thereby obtaining leach liquids, and combining the leach liquids; (4) decoloring the leach liquids, adding a certain amount of activated clay into the leach liquids, stirring and maintaining for a certain time at a certain temperature, and removing the activated clay, thereby obtaining a decolored leach liquid; (5) performing vacuum concentration on the decolored leach liquid till a certain volume is achieved, and separating out the precipitate; (6) centrifuging the concentrated solution to obtain precipitate and water phase; and (7) respectively drying the precipitate and the water phase in vacuum, thereby obtaining a lipid-soluble antioxidant and a water-soluble antioxidant.

Description

technical field [0001] The invention relates to a comprehensive extraction method of various active components of rosemary, in particular to a method for extracting fat-soluble and water-soluble antioxidants from rosemary raw materials. technical background [0002] Rosemary, also known as tansy, is a subshrub or perennial herbaceous spice plant of the Lamiaceae family. It is native to the Mediterranean region. It was successfully introduced in my country in the late 1970s and then promoted throughout the country. In addition to being used as rosemary is mainly used to extract essential oils and antioxidants. Rosemary essential oil is a traditional natural spice, and it also has a certain natural antiseptic effect and clinical efficacy. Its ingredients have functions in medicine and health care, such as anti-inflammatory, anti-tumor, anti-cancer, treatment of cardiovascular diseases, liver protection and enzyme reduction, etc. And other aspects have also received great atte...

AI Technical Summary

Problems solved by technology

The production technology of extracting antioxidant from rosemary mainly has the following deficiencies: (1) need to carry out supercritical extraction, freeze separation or freeze-drying in some existing processes, and its equipment investment is big, causes production cost height; ( 2) Most of the production processes generally only obtain mixed antioxidants without further separation, resulting in a single product that cannot be completely water-soluble or fat-soluble, which limits the application range of the antioxidant and has low added value of resources; (3) Decolorization (4) The irrationality of the existing process in actual production and application: first, some organic solvents such as halogenated hydrocarbons, acetone or methanol are used to extract antioxidants in the process, and these solvents are harmful to The operator is harmful to the body, and the trace solvent residue in the product is harmful to the human body; the second is that some technologies use acid or lye, and acid and alkali will cause the destruction of some active ingredients in rosemary, such as glycosides in acid or alkaline conditions It is easily hydrolyzed under alkaline conditions, and flavonoids are easily degraded under alkaline conditions and lose their antioxidant activity

Activated carbon as an adsorbent can selectively adsorb pigments and odor substances, but activated carbon adsorbents are expensive and have a high oil rate