Method of extracting rosemary as matural antioxidant

Abstract

The present invention relates to method of extracting rosemary natural antioxidant from rosemary plant. The extraction process incldues distilling fresh rosemary plant to obtain resemary oil and material containing resemary antioxidant; crushing the material and adding food level organic solvent in a diffuser to extract rosemary leaching liquid; concentrating the resemary leaching liquid, supercritical extracting and high pressure separation to obtain extractive liquid; recovering solvent; spray or freeze drying to obtain yellowish antioxidant product. The said process obtains rosemary oil and antioxidant separately and has high yield and quality of antioxidant product.

Description

Technical field: [0001] The present invention relates to a method for extracting antioxidants from plants, in particular using solvent extraction and supercritical CO 2 Extraction combines the methods of extracting rosemary's natural antioxidants from the rosemary plant. Background technique: [0002] Among the known technologies, rosemary is used as a raw material to produce essential oils and antioxidants. There are 5 patented technologies disclosed in China. The technology of each patent is mainly: Critical CO 2 Extraction, the mixed extraction of essential oils and antioxidants; 2. Using supercritical CO 2 Reverse extraction of crude extracts extracted with different solvents to obtain essential oils and antioxidants. 3. Use different solvents to extract the extract to evaporate the essential oil first, and then use different solvents to extract antioxidants from the residue. 4. The original plant is crushed, and different solvents are added, and the membrane separat...

AI Technical Summary

Problems solved by technology

[0003] Based on the above-mentioned several rosemary plant extraction processes, there are the following disadvantages in varying degrees: 1. All are extracted with shade-dried original plants, which will easily cause the loss of active ingredient essential oils or antioxidants, and is not conducive to farmers' production operations

2. Most of the technologies use the mixed extraction of essential oils and antioxidants. The obtained antioxidant products have a strong odor and poor quality, which is difficult to be suitable for food additive applications.

3. Due to the use of different solvents for extraction, the consumption of solvents is large, and there are many residues in the product, and the solvents used contain non-food grade solvents, which do not meet the requirements of the food industry

4. Extract directly from the original plant with supercritical, high pressure, demanding technical requirements, and difficult to control; moreover, a large-volume extraction kettle is required, the equipment is difficult to manufacture, the relevant technology is not yet mature, and the one-time investment is large, so it is not suitable for industrialization mass production

5. Add activated carbon to decolorize during the production process, which is easy to absorb active ingredients and affect product yield

Therefore, in terms of the above-mentioned extraction technologies themselves, there are disadvantages such as difficulties in popularization and application, difficulty in industrialized production, or poor product quality. Up to now, these technologies have not been really used in large-scale production.

Therefore, the natural antioxidants of rosemary in the Chinese market are mainly imported from Japan, Europe and the United States, and the price is expensive, which directly affects and restricts the application of this product.