Heidi Norton
There are several methods for extracting fragrance oil from base, including distillation, solvent extraction, expression, sieving, or enfleurage. The most common and economically important technique is organic solvent extraction, which involves submerging and agitating raw materials in a solvent that can dissolve the desired aromatic compounds. This process can be used to extract fragrant compounds from woody and fibrous plant materials, as well as all aromatics from animal sources. Other methods include soaking botanicals in alcohol or pricking citrus peels to puncture the cells containing the oils and then soaking them in warm water to force the oil from the material under high mechanical pressure.
| Characteristics | Values |
|---|---|
| Method | Distillation, solvent extraction, expression, sieving, enfleurage, supercritical CO2 extraction |
| Process | Soaking plant material in a solvent, pricking citrus peels, soaking in warm water, high mechanical pressure, soaking botanicals in alcohol |
| Solvents | Hexane, dimethyl ether, undenatured ethyl alcohol, vodka |
| Raw Materials | Woody and fibrous plant materials, animal sources, citrus fruits, flowers |
| Results | Essential oils, absolutes, concretes, butters |
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What You'll Learn
- Solvent extraction: Soak plant material in a solvent to draw out the fragrance
- Supercritical CO2 extraction: Maintain the integrity of base constituents of the oil without using petroleum solvents
- Distillation: Use heat to separate aromatic compounds from raw materials
- Expression: Prick citrus peels to puncture cells containing oils, then soak in warm water
- Enfleurage: Use a solvent to extract fragrance from flowers
Solvent extraction: Soak plant material in a solvent to draw out the fragrance
Solvent extraction is a method of fragrance extraction that involves soaking plant material in a solvent to draw out the fragrance. This process can be used for any type of plant matter but is typically used for more fragile materials, like flowers.
To extract the fragrance, the raw materials are submerged and agitated in a solvent that can dissolve the desired aromatic compounds. Commonly used solvents for solvent extraction include hexane and dimethyl ether. The fragrant compounds for woody and fibrous plant materials are often obtained in this manner, as are all aromatics from animal sources.
The resulting mixture is then processed several times to separate the absolute from the solvent and any plant residue. In organic solvent extraction, the extract is subjected to vacuum processing, which removes the solvent for re-use. This process can last anywhere from hours to months.
Another easy method of obtaining herbal fragrances is to soak botanicals in alcohol. You should use undenatured ethyl alcohol, but if you can't find this, vodka is acceptable. The fragrant alcohol you create can be used as is, or it can be diluted with some water. These extracts also make a great base for perfumes.
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Supercritical CO2 extraction: Maintain the integrity of base constituents of the oil without using petroleum solvents
There are several ways to extract fragrance oil from base. One method is to soak botanicals in alcohol, using undenatured ethyl alcohol or vodka. The fragrant alcohol can be used as is or diluted with water, and it can also be used as a base for perfumes. Another method is to use a solvent to draw out the fragrance. This involves soaking plant material in a solvent to extract the fragrance. This method is typically used for more fragile plant matter, such as flowers.
Supercritical CO2 extraction is an alternative to traditional separation techniques such as vacuum distillation or organic solvent extraction. It is an environmentally friendly method that uses carbon dioxide pumped into a chamber filled with plant material. The CO2 is in a pressurised, gaseous state but possesses liquid-like properties. The temperature and pressure can be manipulated to alter the density and solvating power of the CO2, allowing for selective extraction of specific compounds. This method helps to maintain the integrity of the base constituents of the oil and produces a highly concentrated finished product without using petroleum solvents. The main advantages of this method are the ease of recovery of the solute and the recycling of the solvent by simple manipulation of temperature or pressure.
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Distillation: Use heat to separate aromatic compounds from raw materials
Distillation is a process that uses heat to separate aromatic compounds from raw materials. It is one of the most common methods of fragrance extraction, alongside solvent extraction, expression, sieving, and enfleurage.
During distillation, raw materials are heated to separate the aromatic compounds. This process can be used to extract fragrances from a variety of materials, including botanicals and animal sources. However, it is important to note that not all aromatic compounds can withstand high heat. For example, flowers such as neroli (orange blossom), jasmine, and rose are typically extracted using solvents rather than distillation.
The distillation process can vary depending on the specific raw materials being used and the desired end product. In some cases, the raw materials may be soaked in warm water to help release the aromatic compounds. Mechanical pressure may also be applied to force the oil from the material.
One of the benefits of distillation is that it can produce a highly concentrated finished product without the need for petroleum solvents. However, it is important to consider that heat can denature some aromatic compounds, changing their odour or rendering them odourless. Therefore, the specific temperature and duration of heat application must be carefully controlled to avoid altering the desired fragrance.
Overall, distillation is a versatile and effective method for extracting fragrances from a wide range of raw materials. By applying heat, the aromatic compounds can be separated and collected, resulting in a concentrated and fragrant product.
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Expression: Prick citrus peels to puncture cells containing oils, then soak in warm water
One way to extract fragrance oil from base is through expression. This method is mostly used to extract citrus essential oils. First, prick the citrus peels to puncture the cells containing the oils. Then, soak the peels in warm water. Finally, force the oil from the material under high mechanical pressure. Many base or carrier oils are extracted in a similar way. However, some aromatic scents come from botanicals for which expression will not work and they cannot tolerate high-heat steam distillation. As a result, the aromatic compounds of many flowers, such as neroli (orange blossom), jasmine, and rose are obtained using solvents.
Solvent extraction involves soaking plant material in a solvent to draw the fragrance out. It works for any type of plant matter but is typically used for more fragile material, like flowers. The resulting mixture is then processed several times to separate the absolute from the solvent and any plant residue. Commonly used solvents for maceration/solvent extraction include hexane and dimethyl ether. In organic solvent extraction, aromatic compounds as well as other hydrophobic soluble substances such as wax and pigments are also obtained.
Another easy method of obtaining herbal fragrances is to soak botanicals in alcohol. You should use undenatured ethyl alcohol. If you can't find this, using vodka is acceptable, but do not use rubbing alcohol. The process is the same as extracting with oils. The fragrant alcohol you create can be used as is, or it can be diluted with some water. These extracts also make a great base for perfumes. To remove the oil from the alcohol, place the container in the freezer.
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Enfleurage: Use a solvent to extract fragrance from flowers
Enfleurage is a method of fragrance extraction that uses a solvent to extract fragrance from flowers. It is a process that involves soaking plant material in a solvent to draw out the fragrance. This method is typically used for more fragile plant matter, such as flowers. The resulting mixture is then processed several times to separate the absolute from the solvent and any plant residue.
To perform enfleurage, you will need to choose a solvent that can dissolve the desired aromatic compounds. Commonly used solvents for this process include hexane and dimethyl ether. Once you have chosen your solvent, you will need to submerge and agitate the raw materials in it. This will help to dissolve the aromatic compounds and release the fragrance.
The length of time required for this process can vary, ranging from hours to months. After the desired amount of time has passed, the extract is subjected to vacuum processing to remove the solvent for re-use.
It is important to note that heat, chemical solvents, or exposure to oxygen during the extraction process may denature some aromatic compounds, changing their odour or rendering them odourless. Therefore, it is crucial to choose the appropriate solvent and process for the specific plant material you are working with.
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Frequently asked questions
Fragrance extraction is the process of separating aromatic compounds from raw materials. The results of the extracts are either essential oils, absolutes, concretes, or butters, depending on the amount of waxes in the extracted product.
There are several methods of fragrance extraction, including distillation, solvent extraction, expression, sieving, or enfleurage. Solvent extraction involves soaking plant material in a solvent to draw the fragrance out. This method works for any type of plant matter but is typically used for more fragile materials, like flowers.
Commonly used solvents for maceration/solvent extraction include hexane and dimethyl ether. In organic solvent extraction, aromatic compounds as well as other hydrophobic soluble substances such as wax and pigments are also obtained.
Another easy method of obtaining herbal fragrances is to soak botanicals in alcohol. You should use undenatured ethyl alcohol, or vodka if you can't find this. The fragrant alcohol you create can be used as is, or it can be diluted with some water.
