Distillation Extraction Method
This is a relatively traditional improved method.
Specific Steps
- Crushing and Expansion: Use a micro crusher equipped with a 1.8mm aperture sieve to crush the myrrh, followed by expansion treatment in an expansion machine at 65°C (for 30-80 minutes). This step helps disrupt the cell structure and improves essential oil extraction efficiency.
- Defatting Treatment: The crushed and expanded myrrh powder is concentrated using a rotary evaporator to obtain a gum, which is then defatted using diethyl ether. The purpose is to remove some resins and impurities, reducing interference in subsequent steps.
- Distillation Extraction: The defatted myrrh is transferred to a distillation apparatus, 60% concentration ethanol is added (myrrh to ethanol mass ratio of 1:7), and three rounds of distillation are performed:
First distillation: 40 minutes
Second distillation: 30 minutes
Third distillation: 22 minutes. The extracts from all three rounds are combined to obtain the crude myrrh extract.
- Concentration and Refining: The crude extract is filtered to remove residues, then dried and concentrated using a rotary evaporator to finally obtain pure myrrh essential oil.
Supercritical CO₂ Extraction Method
This is a modern, highly efficient extraction technology.
Specific Steps
- Crushing: The raw myrrh material is crushed into powder.
- Supercritical Extraction: 10-20 parts (by weight) of myrrh powder are placed in a supercritical CO₂ extraction apparatus. Extraction is carried out for 3-5 hours under conditions of pressure 12-14 MPa, temperature 50-54°C, and CO₂ flow rate 3-5 L/kg·h.
- Low-Temperature Settlement and Filtration: The obtained extract is left to stand at 4°C for 23-25 hours, then filtered and concentrated under reduced pressure to obtain an extract paste.
- Purification: The paste is separated using silica gel column chromatography, eluted sequentially with dichloromethane-methanol solutions of varying volume ratios. The 22:1 elution fraction is collected and concentrated to obtain the purified myrrh volatile oil components.
Advantages of this method include high extraction efficiency, relatively short processing time, and the obtained volatile oil components demonstrate significant anti-tumor activity, making it more suitable for pharmaceutical preparation.
Steam Distillation Method
This is a classic traditional method for extracting essential oils from many plants, commonly used in commercial production, with its process parameters also being optimized through research.
Reference Process Parameters
- Solid-Liquid Ratio: The ratio of myrrh to water is typically 1:5 (weight/volume ratio).
- Soaking Time: 0.5 hours (Research indicates that no soaking or short soaking times are beneficial for the extraction of myrrh volatile oil).
- Extraction Time: 8 hours (Studies found that 8 hours of extraction yields better results than 6 hours).
Brief Process
The processed myrrh material is mixed with water, and steam is introduced for heating, causing the volatile oil components to evaporate with the steam. The vapor is then condensed back into liquid via a condenser, and the essential oil is separated from the water based on density difference.
Advantages of this method are relatively simple equipment and requirements, no organic solvent residues, and suitability for traditional and natural product positioning. Disadvantages include long processing time and relatively lower extraction yield.
Method Comparison and Selection Advice
The table below summarizes the characteristics of the main methods for easy comparison:
| Feature | Distillation Extraction (Patent) | Supercritical CO₂ Extraction | Steam Distillation |
|---|---|---|---|
| Principle | Solvent (Ethanol) extraction & distillation | Uses supercritical CO₂ for extraction | Uses steam to carry out essential oil |
| Extraction Efficiency | High (Patent claims up to 65%) | High | Relatively Low |
| Time Required | Medium (Includes expansion, multiple distillations) | Short (Extraction only 3-5 hours) | Long (Extraction requires 8 hours) |
| Equipment Needs | Requires crushing, expansion, distillation equipment | Requires expensive supercritical extraction equipment | Relatively simple, readily available equipment |
| Cost | Medium | High | Low |
| Operational Difficulty | Medium | High (Requires professional operation) | Low (Easy to learn) |
| Suitable Scale | Small/Medium to Large-scale production | Large-scale production, research institutions | Home experiments, small/medium production |
| Environmental Friendliness | Uses ethanol and diethyl ether | Uses CO₂ (Generally eco-friendly) | Very eco-friendly (Uses only water) |
| Primary Source | CN106753795A | CN201810836167.X | Common traditional method |
Selection Advice
- If you are an essential oil enthusiast or want to try at home: The Steam Distillation Method is likely the most feasible and safest option (avoiding the use of organic solvents like diethyl ether). Be sure to prioritize safety, using appropriate glassware and heat source control.
- If you run a small studio or workshop: You might consider trying the Distillation Extraction Method, but safety is paramount, especially when using and recovering organic solvents like diethyl ether and ethanol, which are flammable and explosive. Operation must be conducted in a well-ventilated environment adhering to relevant safety regulations.
- For industrial-scale production or scientific research: Although the Supercritical CO₂ Extraction Method requires significant upfront investment, its high efficiency and high-quality product may offer greater advantages.
- Regardless of the method, the quality of the raw myrrh (variety, origin, storage conditions) will significantly impact the final oil yield and quality.
Important Reminders
- Safety First: The extraction process may involve high temperatures, high pressures, and flammable/explosive organic solvents (like diethyl ether, ethanol). Always operate in a well-ventilated area, away from ignition sources, and wear appropriate protective equipment (such as gloves, safety glasses). If you lack experience, it is strongly advised to proceed under the guidance of a professional.
- Source of Raw Materials: Ensure the use of high-quality, uncontaminated myrrh resin as the raw material. Different grades and sources of raw material will affect the oil yield and chemical composition.
- Laws and Regulations: If you plan to produce or sell myrrh essential oil on a large scale, please understand and comply with local regulations and safety standards concerning the production of botanical extracts, food, cosmetics, or pharmaceuticals.
- Essential Oil Storage: The prepared myrrh essential oil should be stored in dark glass bottles, sealed and protected from light, in a cool place to extend its shelf life and maintain quality.