A method for extracting plant essential oil containing double auxiliary agents

Abstract

The present invention discloses a method for extracting plant essential oils containing a double auxiliary agent, which is characterized in that aromatic plants are used as raw materials, an extract made of a double auxiliary agent and water for extraction is infiltrated, and then distilled to collect the essential oil; the double auxiliary agent includes component A and component B, the component A includes at least one of choline chloride and betaine, and the component B includes at least one of natural acids, amines, alcohols and sugars. The present invention does not use a deep eutectic preparation method, but directly puts material A and material B into an aqueous phase to form an extract of the double auxiliary agent, thereby simplifying the engineering steps and improving the extraction efficiency. Compared with the existing technology, the present invention uses a green and environmentally friendly double auxiliary agent in combination with traditional distillation technology, which is not only simple to operate and low in cost, but also improves the quality of the essential oil and the efficiency of essential oil extraction.

Description

Technical Field

[0001] The invention relates to a method for improving the extraction efficiency of essential oil by combining double auxiliary agents with a traditional essential oil extraction method, and belongs to the technical field of chemical extraction. Background Art

[0002] Essential oil is a volatile oily substance extracted from aromatic plants. It has a characteristic aromatic aroma and is widely found in the balsam glands of various plants. In addition to giving people a pleasant aroma, essential oils also have a variety of biological activities, so they are widely used in food, cosmetics, textiles and other industries. The extraction method of essential oils is usually steam distillation, or auxiliary methods based on steam distillation, such as enzyme-assisted distillation, ultrasound-assisted distillation, microwave-assisted, ohmic-assisted heating and other distillation methods. The fundamental goal of the auxiliary method is to improve the extraction rate and quality of essential oils.

[0003] Deep eutectic solvent is a new type of solvent prepared by heating hydrogen bond donors and hydrogen bond acceptors, which is characterized by a melting point significantly lower than the melting point of any of its components. Deep eutectic solvents have strong intermolecular forces with the extraction raw materials, which improves the efficiency of extraction. Deep eutectic solvent literature (J.Agric.Food Chem.2017,65,3591-3601; J.Nat.Prod.2018,81,679-690; ACS Sustainable Chem.Eng.2020,8,10591-10612;) published the preparation and extraction of deep eutectics, in which the preparation of deep eutectics is a prerequisite for extraction. Patent CN111171095A discloses a method of extracting flavonoid disaccharide carbonyl glycosides from war bones by forming deep eutectics with choline chloride and any one selected from 1,3-propylene glycol, levulinic acid, glycolic acid and DL-lactic acid in a molar ratio of 1:1-3. CN111116443A discloses a method for extracting carotenoids by mixing hydrogen bond acceptors (choline chloride, DL-menthol) and hydrogen bond donors (tartaric acid, lactic acid, gluconic acid) in a certain proportion at 80-90°C to prepare a natural deep eutectic solvent. The preparation of a deep eutectic solvent is a prerequisite.

[0004] In addition, the amount of deep eutectic is usually mixed with a small amount of water. The amount of deep eutectic solvent used is usually large, which limits its application in essential oil extraction. Summary of the invention

[0005] The technical problems to be solved by the present invention are: using a deep eutectic solvent for extraction, using a large amount of deep eutectic and preparing the deep eutectic in advance.

[0006] In order to solve the above technical problems, the present invention provides a method for extracting plant essential oils containing double additives, characterized in that aromatic plants are used as raw materials, an extract made of the extracted double additives and water is added, stirred evenly, infiltrated, and then distilled to collect the essential oil; the double additives include component A and component B, the component A includes at least one of choline chloride and betaine, and the component B includes at least one of natural acids, amines, alcohols and sugars.

[0007] Preferably, the natural acid is at least one of citric acid, malic acid, tartaric acid, malonic acid, mucic acid and amino acids derived from natural acids; the amines are at least one of organic amines such as urea and methylurea; the alcohols are at least one of diols and triols such as ethylene glycol, 1,4-butanediol, sorbitol and glycerol; the sugar is at least one of monosaccharides, disaccharides and polysaccharides.

[0008] More preferably, the monosaccharide is at least one of maltose and sorbitol.

[0009] Preferably, the mass ratio of component A to component B is 1:0.1-10.

[0010] More preferably, the mass ratio of component A to component B is 1:0.5-5.

[0011] Preferably, the aromatic plant is selected from any one or more of its flowers, leaves, stems and roots.

[0012] Preferably, the raw materials of the dual auxiliary agents are added to deionized water together or added to deionized water step by step, stirred evenly, to prepare an extract.

[0013] Preferably, the mass ratio of the dual auxiliary agent to the extract is 0.1-1000:100.

[0014] Preferably, the distillation is carried out by enzyme-assisted distillation, ultrasound-assisted distillation, ohmic-assisted heating lamp distillation method, supercritical carbon dioxide extraction or subcritical water extraction.

[0015] The present invention avoids using a deep eutectic preparation method, and directly puts material A and material B into the water phase respectively to form an extract containing double auxiliary agents, thereby simplifying the engineering steps and improving the extraction efficiency.

[0016] Compared with the prior art, the present invention combines green and environmentally friendly dual auxiliary agents with traditional distillation technology, which is not only simple to operate and low in cost, but also improves the quality of essential oils and the efficiency of essential oil extraction. DETAILED DESCRIPTION

[0017] In order to make the present invention more clearly understood, preferred embodiments are described in detail as follows.

[0018] Example 1

[0019] The formula of the two-component essential oil hydrosol extraction aid (A+B) is shown in Table 1.

[0020] Table 1

[0021]

[0022]

[0023] Example 2

[0024] A method for extracting plant essential oil (taking dill seeds as an example), comprising the following steps:

[0025] (1) Take 100 g of dill seeds, grind them using a blender, and add the mixture to a 2 L flask.

[0026] (2) Mix 33.3 g of betaine and 66.6 g of malic acid in a beaker.

[0027] (3) Add 500 g of deionized water and stir evenly to obtain an extract.

[0028] (4) Pour the obtained extract containing the dual adjuvants into a flask containing 100 g of dill seeds and perform ultrasonic treatment.

[0029] (5) Distill for 3 hours and collect the obtained dill seed essential oil.

[0030] Example 3

[0031] A method for extracting plant essential oil (taking dill seeds as an example), comprising the following steps:

[0032] (1) Take 100 g of dill seeds, grind them using a blender, and add the mixture to a 2 L flask.

[0033] (2) Mix 66.6 g of betaine and 33.3 g of citric acid in a beaker.

[0034] (3) Add 500 g of deionized water into a beaker and stir well.

[0035] (4) Add 100 g of dill seeds and sonicate.

[0036] (5) Distill for 3 hours and collect the obtained daylily essential oil.

[0037] Example 4

[0038] A method for extracting plant essential oil (taking dill seeds as an example), comprising the following steps:

[0039] (1) Take 100 g of dill seeds, grind them using a blender, and add the mixture to a 2 L flask.

[0040] (2) Mix 16.6 g of betaine and 83.4 g of citric acid in a beaker.

[0041] (3) Add 500 g of deionized water into a beaker and stir well.

[0042] (4) Add 100 g of dill seeds and sonicate.

[0043] (5) Distill for 3 hours and collect the obtained daylily essential oil.

[0044] Example 5

[0045] A method for extracting plant essential oil (taking dill seeds as an example), comprising the following steps:

[0046] (1) Take 100 g of dill seeds, grind them using a blender, and add the mixture to a 2 L flask.

[0047] (2) Take 0.83 g of betaine and 4.17 g of citric acid and mix them in a beaker.

[0048] (3) Add 500 g of deionized water into a beaker and stir well.

[0049] (4) Add 100 g of dill seeds and sonicate.

[0050] (5) Distill for 3 hours and collect the obtained daylily essential oil.

[0051] Example 6

[0052] A method for extracting plant essential oil (taking dill seeds as an example), comprising the following steps:

[0053] (1) Take 100 g of dill seeds, grind them using a blender, and add the mixture to a 2 L flask.

[0054] (2) Mix 33.3 g of betaine and 66.6 g of tartaric acid in a beaker.

[0055] (3) Add 500 g of deionized water into a beaker and stir well.

[0056] (4) Pour the obtained extract containing the dual adjuvants into a flask containing 100 g of daylily and perform ultrasonic treatment.

[0057] (5) Distill for 3 hours and collect the obtained daylily essential oil.

[0058] Example 7

[0059] A method for extracting plant essential oil (taking fennel as an example), comprising the following steps:

[0060] (1) Take 100 g of fennel, grind it in a blender, and add it to a 2 L flask.

[0061] (2) Mix 33.3 g of betaine and 66.6 g of citric acid in a beaker.

[0062] (3) Add 500 g of deionized water into a beaker and stir well.

[0063] (4) Pour the obtained extract containing the dual adjuvant into a flask containing 100 g of fennel and perform ultrasonic

[0064] (5) Distillation is performed for 3 hours, and finally the obtained fennel essential oil is collected.

[0065] Example 8

[0066] A method for extracting plant essential oil (taking agarwood as an example), comprising the following steps:

[0067] (1) Take 100 g of agarwood, crush it using a blender, and add it to a 2 L flask.

[0068] (2) Mix 33.3 g of betaine and 66.6 g of citric acid in a beaker.

[0069] (3) Add 500 g of deionized water into a beaker and stir well.

[0070] (4) Pour the obtained extract containing dual additives into a flask containing 100 g of agarwood and perform ultrasonic treatment.

[0071] (5) Distill for 3 hours and collect the agarwood essential oil.

[0072] Example 9

[0073] A method for extracting plant essential oil (taking low-stem fennel as an example), comprising the following steps:

[0074] (1) Take 100 g of low-stem fennel, grind it in a blender, and add it to a 2 L flask.

[0075] (2) Mix 33.3 g of choline chloride and 66.6 g of citric acid in a beaker.

[0076] (3) Add 500 g of deionized water into a beaker and stir well.

[0077] (4) Pour the obtained extract containing the dual adjuvants into a flask containing 100 g of fennel and perform ultrasonic treatment.

[0078] (5) Distill for 3 hours and collect the fennel essential oil.

[0079] Example 10

[0080] A method for extracting plant essential oil (taking low-stem fennel as an example), comprising the following steps:

[0081] (1) Take 100 g of low-stem fennel, grind it in a blender, and add it to a 2 L flask.

[0082] (2) Take 20g of choline chloride and 80g of urea and mix them in a beaker.

[0083] (3) Add 500 g of deionized water into a beaker and stir well.

[0084] (4) Pour the obtained extract containing the dual adjuvants into a flask containing 100 g of fennel and perform ultrasonic treatment.

[0085] (5) Distill for 3 hours and collect the fennel essential oil.

[0086] Embodiment 11

[0087] A method for extracting plant essential oil (taking low-stem fennel as an example), comprising the following steps:

[0088] (1) Take 100 g of low-stem fennel, grind it in a blender, and add it to a 2 L flask.

[0089] (2) Mix 9.1 g of choline chloride and 90.9 g of sorbitol in a beaker.

[0090] (3) Add 500g of deionized water and stir evenly

[0091] (4) Pour the obtained extract containing the dual adjuvants into a flask containing 100 g of fennel and perform ultrasonic treatment.

[0092] (5) Distill for 3 hours and collect the fennel essential oil.

[0093] Example 12

[0094] A method for extracting plant essential oil (taking low-stem fennel as an example), comprising the following steps:

[0095] (1) Take 100 g of fennel, grind it in a blender, and add it to a 2 L flask.

[0096] (2) Take 0.5 g of choline chloride and 4.5 g of maltodextrin and mix them in a beaker.

[0097] (3) Add 500 g of deionized water into a beaker and stir well.

[0098] (4) Pour the obtained extract containing the dual adjuvants into a flask containing 100 g of fennel and perform ultrasonic treatment.

[0099] (5) Distill for 3 hours and collect the fennel essential oil.

[0100] Embodiment 13

[0101] A method for extracting plant essential oil (taking low-stem fennel as an example), comprising the following steps:

[0102] (1) Add water to the low-stem fennel raw material, the weight of the water being 5-50% of the weight of the dry fennel. Use a blender to grind the raw material, weigh 100 g of the ground material, and add it to a 2 L flask.

[0103] (2) Take 0.91 g of choline chloride and 9.09 g of maltodextrin and mix them in a beaker.

[0104] (3) Add 500 g of deionized water into a beaker and stir well.

[0105] (4) Pour the obtained extract containing the dual adjuvants into a flask containing 100 g of fennel and perform ultrasonic treatment.

[0106] (5) Distill for 3 hours and collect the fennel essential oil.

[0107] Embodiment 14

[0108] Take 30g of fennel and 5g of double auxiliary agent, add them into 100g of deionized water, and then distill.

[0109] The extraction rate of fennel essential oil is shown in Table 1.

[0110] Table 1

[0111]

Claims

1. A method for extracting plant essential oils containing double auxiliary agents, characterized in that: Aromatic plants are used as raw materials, and an extract made of a dual auxiliary agent for extraction and water is stirred evenly, infiltrated, and then distilled to collect essential oil; the dual auxiliary agent comprises a component A and a component B, the component A comprises at least one of choline chloride and betaine, and the component B comprises at least one of natural acids, amines, alcohols and sugars; the natural acid is at least one of citric acid, malic acid, tartaric acid, malonic acid, mucic acid and amino acids; the amine is at least one of urea and methylurea; the alcohol is at least one of ethylene glycol, 1,4-butanediol, sorbitol and glycerol; the sugar is at least one of monosaccharides, disaccharides and polysaccharides; the mass ratio of the component A to the component B is 1:0.1-10; the mass ratio of the dual auxiliary agent to the extract is 0.1-1000:100; the raw materials of the dual auxiliary agent are added to deionized water together or added to deionized water step by step, stirred evenly, and the extract is prepared.

2. The method for extracting plant essential oil containing double auxiliary agents as claimed in claim 1, characterized in that: The monosaccharide is at least one of maltose and sorbitol.

3. The method for extracting plant essential oil containing double auxiliary agents as claimed in claim 1, characterized in that, The mass ratio of component A to component B is 1:0.5-5.

4. The method for extracting plant essential oil containing double auxiliary agents as claimed in claim 1, characterized in that: The aromatic plant is selected from any one or more of its flowers, leaves, stems and roots.

5. The method for extracting plant essential oil containing double auxiliary agents as claimed in claim 1, characterized in that: The distillation adopts enzyme-assisted distillation, ultrasound-assisted distillation, ohm-assisted heating lamp distillation method, supercritical carbon dioxide extraction or subcritical water extraction.

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