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Supercritical CO2 Extraction Of Essential Oil From Jujube Flower

Jujube flower

The sand date flower is the flower of the jujube plant, and is mainly produced in the northwest.

According to the records of the Chinese medicine of Ningxia, the jujube flower mainly contains kaempferol, anthocyanin, fatty oil and a small amount of volatile oil. It has the function of relieving cough and relieving asthma, and can be used for treating chronic bronchitis.

Jujube flower oil

The extraction method of volatile oil from jujube flower is generally steam distillation.

The steam distillation method is characterized by simple equipment and low cost, but the extraction rate is relatively low, and the process is easy to cause damage to heat instability and easily oxidized components. The quality of the products obtained is not high, which in turn affects the efficacy of the drugs and causes losses to the enterprises.

Supercritical CO2 extraction of Jujube Flower Essential Oil

Supercritical fluid technology is widely used in food, medicine, spices and natural pigments. As a solvent, supercritical CO2 fluid technology has the advantages of no pollution, no solvent residue, and does not destroy the active ingredients in the volatile oil of Elaeagnus angustifolia, which makes the volatile oil of Elaeagnus angustifolia safe, reliable and of higher value.

Compared with the steam distillation method, the supercritical CO2 extraction method has the jujube flower of less time consumption, high efficiency, and avoidance of pyrolysis and volatilization of volatile oil components, and is suitable for mass production, and is convenient for subsequent preparation of the preparation.

Therefore, it can reduce costs, save time and bring greater economic benefits for enterprises.

Recently, the laboratory carried out a pilot study on the industrialization process of supercritical CO2 extraction of volatile oil from jujube flower and achieved staged achievements.

The laboratory combines supercritical CO2 fluid technology with other technologies, and through research and development, develops a process route suitable for industrial production of volatile oil from jujube flower, thereby effectively improving the quality of volatile oil of jujube flower and reducing the cost. The extraction process is reasonable, the result is reliable, and the repeatability is good, which can provide a basis for the industrial production of volatile oil of Elaeagnus angustifolia.

If you need to develop the related technology of volatile oil from jujube flower, please contact us immediately.


7 Advantages Of Supercritical Carbon Dioxide Extraction Process

Supercritical CO2 is used in large quantities for extraction because it has the following advantages in extraction technology:

Advantages 1#: Purity Promises, Without Toxic Solvent Residue

In the health, nutraceutical, and personal care markets, consumers value product purity. Supercritical CO2 fluid is a colorless, odorless and non-toxic gas under normal conditions, and after separation from the extracted components, there is no solvent residue at all, which can effectively avoid the residue of solvent toxicity under traditional solvent extraction conditions. It also prevents the extraction process from being toxic to human and polluting the environment, which is a natural and environmentally friendly extraction technology. So the CO2 extraction methods create CO2 essential oil, hemp/cannabis extracts, and CBD products that deliver on purity promises by eliminating harmful solvent residues and reducing unwanted compounds in the finished product.
Further, the Federal Drug Administration (FDA) has labeled CO2 safe for industrial extractions.

Advantages 2#: More Beneficial Unsaponifiable Materials, Low Temperature Extraction

The extraction temperature is low, the critical temperature of CO2 is 31.265℃ and the critical pressure is 72.9 atm, which can effectively prevent the oxidation, escape and reaction of heat-sensitive components and retain the biological activity of the biomass intact; meanwhile, it can also extract the high boiling point, low volatility and easy pyrolysis substances below their boiling point temperature.

The production of essential oils requires heat in order to distill the plant material. Even for cold-pressed citrus oils, some heat can be involved due to the friction involved. CO2 Extracts possess an advantage over essential oils because the botanical material and supercritical CO2 extraction process require much less heat. Low-temperature CO2 extracts generally contain the volatile (aromatic) components of the botanical that are soluble in liquefied CO2. Aromatic molecules each have their own molecular weight. Some aromatic molecules are too heavy to be present in a steam-distilled essential oil. However, some of the heavier aromatic molecules are present in CO2 extracts. Therefore, CO2 extracts often smell closer to the aroma of a natural herb than some steam-distilled essential oils.

CO2 supercritical extraction isn’t limited to just the production of aromatic extracts. Low-temperature CO2 extraction can also be used to produce superior lipids (carrier oils) that contain more of the beneficial unsaponifiable materials of the plant that cold pressing isn’t able to extract. Additionally, the biomass(plant) is not subjected to extreme temperatures, so CO2 extract does not experience degradation as it does during other extraction methods.

Advantages 3#: Less Steps And Easier, Extraction And Separation In One

Extraction and separation are combined into one, when the supercritical fluid of carbon dioxide full of solubles flows through the separator, the CO2 and the extracted material quickly recover into two separate phases (gas-liquid separation) and immediately separate, there is no material phase change process, no need to recover solvent, easy to operate, and this makes processing quicker and more efficient; The yield using supercritical CO2 extraction process is higher than other extraction methods, the yield and quality of product can easily be varied by adjusting the physical properties, not only high extraction efficiency, but also less energy consumption, cost saving, and in line with the trend of environmental protection and energy saving.

Advantages 4#: Truly “Green” Production, Extraction Operation Is Simple

The extraction operation is easy, and both pressure and temperature can be the parameters to regulate the extraction process. Near the critical point, small changes in temperature and pressure can cause significant changes in the density of CO2, thus causing changes in the solubility of the material to be extracted, and the extraction can be achieved by controlling the temperature or pressure. The pressure is fixed and the temperature can be changed to separate the substances; conversely, the temperature is fixed and the pressure can be lowered to separate the extracted substances.

Unlike hydrocarbon solvents or ethanol extraction, the supercritical CO2 extraction process can be fine-tuned by adjusting temperature and pressure to achieve variable density, viscosity, and surface tension. This makes processing quicker and more efficient while also targeting only the desired compounds in the biomass such as hemp/cannabis. Therefore, the CO2 extraction process technology is short, small in size, and really friendly to the environment. It is a truly “green” production process. Supercritical CO2 has become a favorite of eco-conscious producers of essential oils, cannabis & hemp extracts, and nutraceuticals due to its Green properties

Advantages 5#: Ultra-Low Post-Operation Cost

Supercritical CO2 is highly competitive with butane and ethanol extractions, particularly for large-scale industrial extraction facilities that are found in the hemp industry. At a large scale, solvent costs dominate the operating cost of the extraction facility and that is where supercritical CO2 excels. Bulk carbon dioxide costs $0.06-$0.10 per pound; no hydrocarbon or alcohol-based solvent can come close to that cost.
More and more processors are choosing to center their businesses around CO2 as a result.

Advantages 6#: Extract Greater Than 95% Of Target CompoundsWide Range Of Options

The polarity of the supercritical fluid can be changed, and under certain temperature conditions, substances with different polarities can be extracted by changing the pressure or adding the appropriate entraining agent. Specifically, with manufacturers of products (CO2 essential oils, cannabis & hemp extracts) derived from botanical matter (plants), the supercritical CO2 is highly favorable because the supercritical CO2 fluid is highly efficient when targeting specific compounds within plants. The supercritical CO2 extraction process is often able to extract greater than 95% of target compounds in oils found in plants.

Advantages 7#: The Efficiency Of Co2 Extraction Process Can Eliminate Some Post-Processing Steps

The supercritical CO2 extraction process not only extracts more botanical compounds faster but also eliminates the need for some post-processing steps. Such as CO2 acts as a cleaning agent, so microbial bacteria, molds, and mildew are killed during the process.
This gets your CO2 extract into blends and final products — and on its way to the shelf — faster than other extraction methods, too.

Works Cited: CO2 Extraction Process: Basics, 5 Advantages, 7 Features, 4 Applications

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