Antioxidants, rosemary essential oil, etc. can be extracted from rosemary.
The main components of antioxidants are diterpenoids, flavonoids, triterpenoids and other compounds with antioxidant functions; rosemary essential oil is a liquid oil composed of more than 30 volatile components.
Rosemary and its extract can well prevent oxidation reaction in meat food processing, and protect the flavor of processed food. This kind of property has very good stability and is not easy to volatile. At the same time, it has a certain control effect on taste and aroma.
Rosemary extract has a strong dissolving power.
It can be made into fat-soluble products or water-soluble products. Therefore, it has strong adaptability in food applications and has the function of stabilizing fats and essential oils in food processing.
Method for extraction of rosemary essential oil
Extracted substance: volatile components of rosemary
According to the vapor pressure of each component of the volatile oil, the essential oil is extracted from the raw material by using water vapor
Degree of crushing, soaking time, amount of water added, extraction time
Simple operation, low cost, and can reduce the distillation temperature of perfume ingredients, prevent the decomposition or deterioration of the extract, the extraction process is relatively mature, the output is large, and it does not pollute the environment.
The steam distillation extraction process takes a long time and the system is open. The process will cause thermal instability and the loss of easily oxidizable components, which will damage some components. Therefore, it is only suitable for extracting essential oils.
If other active ingredients need to be extracted, other extraction methods need to be combined, and the process will become complicated and costly.
Solvent extraction method
Effective substances in rosemary
Use organic solvents such as petroleum ether, n-hexane, ethyl acetate, acetone, ethanol as extraction solvents to dissolve the effective substances.
Taking into account factors such as safety, effectiveness, economy, etc., rosemary extraction generally uses ethanol as an organic solvent. Ethanol is suitable for extraction within 2 h, with a liquid-to-material ratio of 10:1.
The concentration of ethanol should not be too high, so as not to dissolve non-polar substances in rosemary, such as chlorophyll. And this method is often combined with microwave shaking and other methods to achieve higher yields.
Ethanol concentration, extraction temperature, material-to-liquid ratio, extraction time and extraction times, etc.
The solvent method is used to analyze the extraction of medicinal materials rich in carnosic acid. The extraction process has high extraction rate and good stability, and is suitable for industrial applications;
Ursolic acid is extracted from rosemary, the extraction rate is 92.38%, its purity is high, and many antioxidant components in rosemary can be extracted at the same time. The method is safe, effective, environmentally friendly, easy to operate, and relatively low cost.
Carnosic acid is greatly affected by operating conditions during the separation process, and is easily converted into carnosol, an oxidation intermediate product, which reduces the antioxidant effect and makes it difficult for the product to meet the requirements of the international market.
Rosmarinic acid, carnosic acid, carnosol, ursolic acid, oleanolic acid, etc.
With the increase of time in the ultrasonic extraction process, the yield of carnosic acid and rosmarinic acid gradually increased. After 50 min, the yield of carnosic acid tends to decrease. It is speculated that carnosic acid will be partially degraded or dissimilar under long-term ultrasound. Structured. The material-to-liquid ratio has no significant effect on the yield of rosmarinic acid, but has a significant effect on the yield of carnosic acid.
Advantages and disadvantages
Although ultrasonic extraction takes a long time to extract, there are few impurities in the liquid medicine, and the effective ingredients are easy to separate and purify; the extraction temperature is low, and the effective ingredients are not easily deteriorated; the operation cost of the extraction process is low, and the comprehensive economic benefits are significant; the operation is simple and easy, equipment maintenance, Easy maintenance, etc.
Essential oils and antioxidants (rosmarinic acid, carnosic acid, etc.).
BIT assisted the laboratory of a university in China to extract the antioxidant components of natural rosemary by supercritical carbon dioxide extraction. The best extraction parameters were 40MPa pressure, 80°C temperature, 20% water addition, and 2.5h access time. Rosmarinic acid, carnosic acid and other ingredients are mainly extracted.
Another university’s laboratory concluded that the best process conditions are: extraction pressure 32.6 MPa, temperature 56.5 ℃, entrainer dosage 0.6 mL/g, and extraction time 1 h. In addition, the choice of the composite carrier co-solvent “E6K-10ET” not only significantly improved the physical and chemical properties of the extracted product, but also had a very significant solubilizing effect. The extraction yield of carnosic acid increased from 25.83% to 62.14%.
The method is simple, fast and efficient, and the obtained essential oil is of pure quality and high in antioxidant active ingredients. Due to the low cost, no pollution, energy saving, simple operation, environmental protection, and the advantages of simultaneous separation and purification, the method has been widely used in the extraction and separation of natural antioxidants.
Subcritical CO2 fluid extraction
Flavonoids, saponins, terpenes, antioxidants and volatile oils
Using subcritical fluid as the extractant, in a low-pressure, oxygen-free, airtight container, according to the principle of similar compatibility, through the molecular diffusion process of the extraction material and the extractant in the soaking process, the product and the extraction are extracted through vacuum evaporation Agent separates out.
Temperature, time, organic solvent, surfactant addition, extraction times, etc.
The choice of solvents is wide, the source of fluid is wide, the price is lower, the dissolution consumption is low, the extraction quality is high, environmental protection, fast, suitable for heat-sensitive ingredients, etc.
oils and alkaloids of rosemary.
Microwave has different effects on different parts of plants and different tissues, and the release of intracellular products has a certain selectivity. Therefore, different treatment methods should be adopted according to the characteristics of plant products and their different parts.
Microwave can penetrate the extraction medium and heat directly, which can shorten the extraction time and improve the extraction efficiency.
In a paper, the author microwave-assisted extraction of rosemary volatile oil, the best process conditions are: the material-to-liquid ratio is 12.3 mL/g, the extraction time is 125s, the microwave power is 500W, and the extraction rate is 4.05%.
Microwave extraction is less limited by the affinity of the solvent, and there are more solvents to choose from, reducing the amount of solvent.
It is safe, reliable, pollution-free, and belongs to a green project. Microwave extraction does not require pretreatment such as drying, which simplifies the process, reduces investment, and the result of extraction is not affected by the water content of the substance and can be recycled
It has the advantages of strong selectivity, short operating time, low solvent consumption, easy control, simple equipment, environmental protection, and low investment.
Other extraction methods
The extraction methods used to extract the active ingredients of rosemary include enzymatic hydrolysis, microcapsule two-phase extraction and so on.
According to the composition of the plant cell wall, using the high specificity of the enzyme, the corresponding enzyme is selected to hydrolyze and degrade the constituent components of the cell wall, destroy the cell wall structure, and dissolve, suspend or peptize the effective components in the cell into the solution, thereby To achieve the purpose of extraction.
Extraction time can be shortened, and the purity of the active ingredients is high, but the technical requirements are high.
Microcapsule aqueous two-phase extraction method
The combined use of microcapsules and two-phase water technology not only improves the extraction efficiency and purification degree of volatile oil, but also effectively protects the transformation of unstable components during the extraction process.
Rosemary essential oil CO2 extraction plant Cost and machine extraction co2 price
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