Plant-source odor-removing spray as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of biomedical compositions, and particularly discloses a botanical odor-removing spray which contains lemon eucalyptus leaves, rosemary, mint leaves, an agilawood extract, ethanol, deionized water, tween-80, propylene glycol, lavender essential oil and a specific slow-release organic compound. The preparation method of the spray is scientific and reasonable, and the components have a remarkable synergistic effect. Tests show that the removal rate of various peculiar smells such as kitchen oil smoke smells exceeds 90%, and the smell removal can last for 4-6 hours by spraying the deodorant once. The air freshener is natural, safe, non-irritant and pleasant in fragrance, can be widely applied to families, public places, automobiles and the like, effectively solves the problem of peculiar smell, creates a fresh and comfortable air environment, and has great market popularization value.

Description

Technical Field

[0001] The invention belongs to the technical field of biomedicine and chemistry, and specifically relates to a plant-derived deodorizing spray and a preparation method and application thereof. Background Art

[0002] In daily life, odor problems are everywhere and are a serious problem. In the home environment, the smell of cooking fumes permeates the entire space, the rancid smell in the trash can is disgusting, the special smell of pets and various odors in the bathroom greatly destroy the comfortable atmosphere of the family. Public places are even more "disaster areas" for odors. There are many people in the office, and the sweat odor of the human body is mixed with the odor of office supplies; shopping malls, hotels and other places have a large flow of people and frequent activities, and odors such as food residues and smoke are intertwined; public transportation such as buses and subways are relatively closed, and odors are difficult to dissipate.

[0003] Traditional deodorizing products are mainly divided into chemical synthesis and physical adsorption. Chemical synthesis deodorizers, such as common air fresheners, often only cover up odors by emitting strong fragrances, but cannot fundamentally eliminate the source of odors. The chemical components they contain, such as certain volatile organic compounds, may cause potential harm to human health, easily induce respiratory allergic reactions, irritate sensitive parts such as the skin and eyes, and long-term use may also leave harmful substances in the indoor environment, posing a continuous threat to the health of residents. Although physical adsorption products such as activated carbon bags can adsorb some odor molecules, their adsorption capacity is limited, the adsorption speed is relatively slow, and they need to be replaced regularly, which is extremely inconvenient to use. Moreover, for some large molecular odor substances, the adsorption effect is not ideal, and it is difficult to meet people's actual needs for fast and efficient deodorization.

[0004] With the increasing awareness of environmental protection and the increasing attention to their own health, plant-based deodorizing products have gradually come into the public eye and are favored. However, the existing plant-based deodorizing sprays are not perfect. The deodorizing effect of many products is not long-lasting. They can often reduce the odor in a short time after spraying, but the odor will reappear after a period of time, and the air cannot be kept fresh for a long time; the deodorizing range of some products is relatively narrow, and they can only work on one or several specific odors. For complex mixed odor environments, their processing capacity is obviously insufficient; some products are not coordinated and natural in the blending of fragrances, and may produce pungent or overly strong odors after spraying, which brings unpleasant use experience to users and affects the overall quality and market acceptance of the product. Therefore, the development of a plant-based deodorizing spray with high efficiency, long-lasting deodorizing performance, a wide range of deodorizing, a natural and pleasant fragrance, and safe and non-irritating has become a problem that needs to be solved urgently, and has extremely important practical significance and broad market prospects. Summary of the invention

[0005] The present invention provides a plant-derived deodorizing spray, comprising the following components in parts by weight:

[0006] 8-12 parts of lemon eucalyptus leaf extract; 6-9 parts of rosemary extract; 5-8 parts of peppermint leaf extract; 3-6 parts of agarwood extract; 20-30 parts of ethanol; 40-60 parts of deionized water; 1-3 parts of Tween-80; 3-6 parts of propylene glycol;

[0007] 0.5-1 part lavender essential oil;

[0008] Furthermore, the lemon eucalyptus leaf extract is prepared by a steam distillation method, comprising the following steps: collecting fresh lemon eucalyptus leaves, washing them and then drying them naturally or drying them at low temperature, crushing them and placing them in a distillation device, adding an appropriate amount of water, heating and distilling them for 2-3 hours, collecting the volatile oil obtained by distillation, and drying them with anhydrous sodium sulfate to obtain the lemon eucalyptus leaf extract.

[0009] Furthermore, the rosemary extract is prepared by supercritical carbon dioxide extraction, comprising the following steps: taking dried rosemary plants, crushing them into fine powder, extracting them for 1-2 hours under the conditions of a pressure of 20-30 MPa and a temperature of 40-50° C., and separating the extract under reduced pressure to obtain the rosemary extract.

[0010] Furthermore, the mint leaf extract is prepared by an ultrasonic-assisted extraction method, comprising the following steps: picking fresh mint leaves, washing and freeze-drying, using ethanol as an extraction solvent, ultrasonically extracting for 30-45 minutes at an ultrasonic power of 200-300W, filtering the extract, and rotary evaporating and concentrating to obtain the mint leaf extract.

[0011] Furthermore, the agarwood extract is prepared by Soxhlet extraction and silica gel column chromatography purification, comprising the following steps: selecting high-quality agarwood, crushing it into fine powder, using Soxhlet extraction, using a mixed solvent of n-hexane and ethyl acetate (volume ratio of 4:1) as the extraction solvent, extracting at 60-80°C for 4-6 hours, and removing the solvent by rotary evaporation to obtain a crude agarwood extract, and then purifying the crude extract by silica gel column chromatography, using a mixed solvent of petroleum ether-acetone in different proportions as the eluent, collecting the fractions containing the target active ingredient, and obtaining the agarwood extract after vacuum drying.

[0012] Furthermore, the invention also comprises compound A: 2-4 parts of 3-hydroxy-4-methoxy-2-butanone; and compound B: 1.5-3 parts of ethyl 2-cyclopentyloxyacetate.

[0013] Furthermore, the compound A is prepared by using 3-hydroxy-2-butanone as a raw material and reacting it with methyl iodide under alkaline conditions. After preparation, it is mixed with an appropriate amount of ethanol and treated under ultrasonic conditions for 15-20 minutes to fully and evenly disperse it to form a stable dispersion for use.

[0014] Furthermore, the compound B is prepared by esterification reaction with cyclopentanol and ethyl chloroacetate as raw materials under the action of an alkaline catalyst, and then dissolved in a small amount of propylene glycol, and completely dissolved under the conditions of heating to 40-50° C. and stirring to form a uniform solution for standby use.

[0015] On the other hand, the present invention also provides a method for preparing the plant-based deodorizing spray, comprising the following steps: S1: preparing lemon eucalyptus leaf extract, rosemary extract, mint leaf extract, agarwood extract, compound A dispersion and compound B solution respectively;

[0016] S2: The prepared lemon eucalyptus extract, rosemary extract, mint leaf extract and agarwood extract are mixed with ethanol, deionized water, Tween-80, propylene glycol, lavender essential oil and the treated compound A dispersion and compound B solution in a prescribed proportion, and the plant extracts are first dissolved in an appropriate amount of ethanol, fully dissolved under stirring conditions, and then Tween-80, propylene glycol, lavender essential oil, compound A dispersion, compound B solution and deionized water are added in sequence, and stirred in a stirrer at a speed of 300-500 rpm for 20-30 minutes until a uniform and stable spray solution is formed;

[0017] S3: Filter the prepared spray solution through a 0.22 μm microporous filter membrane to remove impurities, insoluble particles and possible microorganisms in the solution to obtain a finished plant-based deodorizing spray, which is then packaged in spray bottles.

[0018] Furthermore, the plant-derived deodorizing spray is used in air purification to remove odors in homes, public places or car interiors.

[0019] Beneficial effects of the invention:

[0020] Plant extracts work synergistically with slow-release organic compounds. Lemon eucalyptus extract, rosemary extract, mint leaf extract and agarwood extract each have a unique mechanism of action for different types of odor molecules. For example, lemon eucalyptus extract targets a variety of common odor molecules and microbial odor sources, and rosemary extract focuses on organic odor substances. Compound A (HMB) has a good binding effect on ammonia and thiol odor molecules, and compound B (CPOAE) can effectively treat aldehyde and ketone odor molecules. They work together to inhibit the microorganisms at the source of odor generation, change the structure of odor molecules, capture and neutralize odor molecules, and target specific types of odor molecules. The fixed binding or chemical environment changes have shown excellent removal effects on common odors such as kitchen fume, garbage odor, toilet odor, human sweat, smoke, and formaldehyde. The addition of agarwood extract further enhances the overall deodorization effect. The active ingredients such as sesquiterpenoids and aromatic compounds contained in it work together with other plant extracts to act on odor molecules, changing the physical and chemical properties of odor molecules through adsorption and chemical reactions, making odor molecules easier to be processed by other ingredients or lose their own odor characteristics. At the same time, its unique aroma components do not affect but assist the deodorization process in the process of soothing nerves and creating an elegant fragrance atmosphere, so that deodorization and fragrance creation are carried out in synergy. The four plant extracts each contribute to the persistence of deodorization and work together. Lemon eucalyptus leaf extract reduces the generation and emission of odor from the root, the antioxidant properties of rosemary extract help to maintain fresh air for a long time, the volatile components of mint leaf extract continue to emit and the characteristics of combining and decomposing with odor molecules continue to play a role, and the characteristics of agarwood extract adsorbing and reacting to odor molecules and having a long-lasting aroma also help to last for a long time. On this basis, compound A (HMB) can continuously bind to and fix odor molecules, and compound B (CPOAE) continuously reduces the volatility of odor molecules. The slow-release effect of the two cooperates with the long-lasting effect of plant extracts, so that the deodorization effect can be maintained for a long time. Lavender essential oil works synergistically with other plant extracts and compounds. Lavender essential oil not only has a unique aromatic scent, but also blends with the scents of lemon eucalyptus, rosemary, mint leaves, and agarwood to create a natural and soothing fragrance environment. This fragrance does not simply cover up the odor, but works synergistically with the entire deodorization process. When plant extracts and slow-release organic compounds are used to treat odor molecules, the fragrance components can assist in changing the microenvironment around the odor molecules. The safety of plant extracts and compounds works synergistically. Plant extracts themselves are derived from natural plants, have good biocompatibility, and are non-irritating to the human respiratory tract, skin, and eyes. Compound A (HMB) and Compound B (CPOAE) are small organic molecule compounds. Their safety was fully considered during the design and synthesis, and they have no obvious toxicity or irritation.The synergy between the plant extract and the compound in terms of safety ensures that the spray of the present invention can ensure the health and safety of users when used in various environments such as homes, public places and cars. It is especially suitable for the elderly, children, pregnant women and people who are sensitive to chemical substances, providing a green, environmentally friendly and gentle solution for air purification, and enhancing the overall advantages and application scope of the product from a safety perspective. DETAILED DESCRIPTION

[0021] Example 1

[0022] 1. Purpose of the test

[0023] The differences in deodorizing effect, durability and safety between the plant-derived deodorizing spray of the present invention and traditional chemically synthesized deodorizing agents were compared.

[0024] 2. Test Materials

[0025] 1. Experimental spray 5: A plant-based deodorizing spray prepared according to the present invention, comprising lemon eucalyptus leaf extract, rosemary extract, mint leaf extract, agarwood extract, compound A, compound B, ethanol, deionized water, Tween-80, propylene glycol, and lavender essential oil, and the content of each ingredient is within the specified range.

[0026] 2. Traditional chemical synthetic deodorants: A certain brand of air freshener commonly found on the market, its main ingredients are fragrances, fungicides and organic solvents.

[0027] 3. Test odor source:

[0028] 1. Toilet odor simulation device: Place 200 grams of human excrement (simulated feces) in a sealed container and place it at 30°C for 24 hours to produce a strong odor gas.

[0029] 2. Smoke odor simulation device: Continuously burn 5 cigarettes in a sealed space of 2 cubic meters, filling the space with thick smoke and odor.

[0030] 3. Test methods

[0031] 1. Determination of odor removal rate:

[0032] 1. In two 1m 3 The sealed test box is filled with toilet odor gas and smoke odor gas, and then the test spray 5 and the traditional chemical synthetic deodorant are sprayed in the corresponding test box according to the recommended dosage to make the spray evenly distributed.

[0033] 2. Use the electronic nose to detect the concentration of odorous gas in the box 20 minutes, 1 hour, and 2 hours before spraying and after spraying, and calculate the odor removal rate at different time points. Repeat 3 times for each sample.

[0034] 2. Durability test:

[0035] 1. Continue to observe the changes in odor concentration in the above test chamber within 6 hours, record the odor concentration data every hour, and determine the duration of the deodorization effect.

[0036] 3. Safety testing:

[0037] 1. Select 30 healthy mice and randomly divide them into two groups, with 15 mice in each group.

[0038] 2. Spray the test spray 5 and the traditional chemical synthetic deodorant into the cages of the two groups of mice, once a day for 7 consecutive days, observe the physiological state, respiratory health, skin condition, etc. of the mice, and record whether any adverse reactions occur.

[0039] 4. Test results

[0040] 1. Odor removal rate test results:

[0041] 1. Removal rate of bathroom odor:

[0042] 1. Test spray 5 had a removal rate of 80% at 20 minutes, 90% at 1 hour, and 95% at 2 hours.

[0043] 2. The removal rate of traditional chemical synthetic deodorants is 50% in 20 minutes, 60% in 1 hour, and 65% in 2 hours.

[0044] 2. Removal rate of smoke odor:

[0045] 1. Test spray 5 had a removal rate of 75% at 20 minutes, 85% at 1 hour, and 92% at 2 hours.

[0046] 2. The removal rate of traditional chemical synthetic deodorants is 40% in 20 minutes, 50% in 1 hour, and 55% in 2 hours.

[0047] 2. Durability test results:

[0048] 1. The deodorizing effect of the test spray 5 can last for more than 5 hours in the bathroom odor environment and for more than 4.5 hours in the smoke environment, and the odor concentration is relatively stable during the duration.

[0049] 2. In the odorous environment of the bathroom, the deodorizing effect of traditional chemical synthetic deodorizers begins to decline significantly after 2 hours and lasts for about 3 hours; in the smoky environment, the odor begins to rebound after 1.5 hours and lasts for about 2.5 hours.

[0050] 3. Safety test results:

[0051] 1. In the group of mice sprayed with test spray 5, during the 7-day test period, the mice moved normally, showed no respiratory irritation symptoms (such as coughing, shortness of breath, etc.), and had no redness, swelling or allergic reactions on the skin.

[0052] 2. In the group of mice sprayed with traditional chemical synthetic deodorants, 5 mice developed mild coughing on the third day of the experiment, and 2 mice developed mild redness on their skin.

[0053] Example 2

[0054] 1. Purpose of the test

[0055] The differences in deodorizing range and synergistic enhancement between the plant-derived deodorizing spray of the present invention and a single plant-derived deodorizing spray were compared.

[0056] 2. Test Materials

[0057] 1. Experimental spray 6: A plant-based deodorizing spray prepared according to the present invention, comprising lemon eucalyptus leaf extract, rosemary extract, mint leaf extract, agarwood extract, compound A, compound B, ethanol, deionized water, Tween-80, propylene glycol, and lavender essential oil, and the content of each ingredient is within the specified range.

[0058] 2. Single plant-based deodorizing spray 1: A spray containing only lemon eucalyptus leaf extract. The content of lemon eucalyptus leaf extract is equivalent to the proportion of lemon eucalyptus leaf extract in the total plant extract in test spray 6. Other ingredients are similar to test spray 6, but it does not contain other plant extracts, compound A and compound B, and the proportion of ingredients is adjusted accordingly.

[0059] 3. Single plant source deodorizing spray 2: A spray containing only rosemary extract. The content of rosemary extract is equivalent to the proportion of rosemary extract in the total plant extract in test spray 6, and the ingredients are adjusted in the same way.

[0060] 4. Single plant-based deodorizing spray 3: A spray containing only mint leaf extract. The content of mint leaf extract is equivalent to the proportion of mint leaf extract in the total plant extract in test spray 6, and the ingredients are adjusted in the same way.

[0061] 5. Single plant-based deodorizing spray 4: A spray containing only agarwood extract. The content of agarwood extract is equivalent to the proportion of agarwood extract in the total plant extract in test spray 6, and the ingredient adjustment is similar.

[0062] 6. Test odor source:

[0063] 1. Mixed odor simulation device 1: Place 100 grams of garbage (including food residues, fruit peels, etc.), 50 milliliters of spoiled cooking oil and 20 grams of cigarette butts in a sealed container and place it at 25°C for 12 hours to produce a complex mixed odor.

[0064] 2. Mixed odor simulation device 2: Collect 50 grams of urine and feces from pet cats, mix them with 100 grams of wet sawdust, seal them and place them for 6 hours to produce pet odor.

[0065] 3. Test methods

[0066] 1. Determination of odor removal rate:

[0067] 1. In four 1m 3 The sealed test box is filled with odor gases generated by the mixed odor simulation device 1 and the mixed odor simulation device 2, and then the test spray 6 and four single plant source deodorizing sprays are sprayed in the corresponding test boxes respectively to make the sprays evenly distributed.

[0068] 2. Use gas chromatography-mass spectrometry to detect the concentration of odorous gases in the box before spraying and 30 minutes, 2 hours and 4 hours after spraying, and calculate the odor removal rate at different time points. Repeat each sample 3 times.

[0069] 2. Synergy evaluation:

[0070] 1. Analyze the difference in odor removal rate between the test spray 6 and the single plant-based deodorizing spray at the same time point, and calculate the synergistic coefficient (synergistic coefficient = odor removal rate of the test spray 6 - average odor removal rate of the single plant-based deodorizing spray).

[0071] 4. Test results

[0072] 1. Odor removal rate test results:

[0073] 1. Removal rate of mixed odor simulation device 1:

[0074] 1. Test Spray 6 had a removal rate of 85% at 30 minutes, 92% at 2 hours, and 96% at 4 hours.

[0075] 2. The removal rate of single plant source deodorizing spray 1 was 50% at 30 minutes, 60% at 2 hours, and 65% at 4 hours.

[0076] 3. The removal rate of single plant source deodorizing spray 2 was 45% at 30 minutes, 55% at 2 hours, and 60% at 4 hours.

[0077] 4. The removal rate of single plant source deodorizing spray 3 was 40% at 30 minutes, 50% at 2 hours, and 55% at 4 hours.

[0078] 5. The removal rate of single plant source deodorizing spray 4 was 35% at 30 minutes, 45% at 2 hours, and 50% at 4 hours.

[0079] 2. Removal rate of mixed odor simulation device 2:

[0080] 1. Test Spray 6 removed 82% at 30 minutes, 90% at 2 hours, and 94% at 4 hours.

[0081] 2. The removal rate of single plant source deodorizing spray 1 was 48% at 30 minutes, 58% at 2 hours, and 63% at 4 hours.

[0082] 3. The removal rate of single plant source deodorizing spray 2 was 43% at 30 minutes, 53% at 2 hours, and 58% at 4 hours.

[0083] 4. The removal rate of single plant source deodorizing spray 3 was 38% at 30 minutes, 48% at 2 hours, and 53% at 4 hours.

[0084] 5. The removal rate of single plant source deodorizing spray 4 was 33% at 30 minutes, 43% at 2 hours, and 48% at 4 hours.

[0085] 2. Results of synergy assessment:

[0086] 1. For the mixed odor simulation device 1, the synergistic coefficient was 20% at 30 minutes, 27% at 2 hours, and 31% at 4 hours.

[0087] 2. For the mixed odor simulation device 2, the synergistic coefficient was 19% at 30 minutes, 26% at 2 hours, and 30% at 4 hours.

[0088] It can be seen from Example 1 that the plant-derived deodorizing spray of the present invention has significant advantages in deodorizing effect and durability compared with traditional chemical synthetic deodorizing agents, and is safer. It can be seen from Example 2 that the plant-derived deodorizing spray of the present invention has a significant improvement in deodorizing range and effect compared with a single plant-derived deodorizing spray due to the synergistic effect of multiple plant extracts and compounds, and has a good synergistic effect.

[0089] Example 3

[0090] Application of compound A (HMB) in plant-derived deodorizing spray

[0091] 1. Purpose of the experiment

[0092] The purpose of this study was to investigate the synergistic effect of compound A (HMB) in a plant-based deodorizing spray, and to evaluate its effect on the odor removal effect and persistence compared with a spray without compound A.

[0093] 2. Test Materials

[0094] 1. Experimental spray 1: A plant-based deodorizing spray prepared according to the preparation method described in the above invention content, comprising lemon eucalyptus leaf extract, rosemary extract, mint leaf extract, agarwood extract, ethanol, deionized water, Tween-80, propylene glycol, lavender essential oil and compound A (HMB), and the content of each ingredient is within the specified range.

[0095] 2. Test spray 2: Similar to test spray 1, but does not contain compound A (HMB), and the contents of other ingredients are adjusted accordingly.

[0096] 3. Test odor source:

[0097] 1. Garbage odor simulation device: Place some rotten fruits, vegetables and domestic garbage in a sealed bag, tie the bag tightly, and after a period of time, garbage rotten odor gas will be generated.

[0098] 2. Smoke simulation device: Light a cigarette in a sealed box to produce smoke gas.

[0099] 3. Test methods

[0100] 1. Determination of odor removal rate: Spray different sprays on a volume of 1m 3 In a sealed test box, the box is pre-filled with specific odor gases (such as garbage odor or smoke) to make the spray evenly distributed in the box. Before spraying and a certain time after spraying (such as 30 minutes), use professional odor detection instruments (such as gas chromatography-mass spectrometry or electronic nose) to detect the concentration of odor gases in the box, and calculate the odor removal rate. Repeat 3 times for each sample.

[0101] 2. Durability test: After spraying the spray in the above test box, use an odor detection instrument to detect the odor gas concentration in the box every hour, observe the change of odor concentration over time, and determine the duration of the deodorization effect.

[0102] 4. Test results

[0103] 1. Odor removal rate measurement results

[0104] 1. Removal rate of garbage odor

[0105] 1. The removal rate of the test spray 1 (containing compound A) was 94%.

[0106] 2. The removal rate of test spray 2 (without compound A) was 85%.

[0107] 2. Removal rate of smoke odor

[0108] 1. The removal rate of the test spray 1 (containing compound A) was 93%.

[0109] 2. The removal rate of test spray 2 (without compound A) was 82%.

[0110] 2. Durability test results

[0111] 1. The deodorizing effect of the test spray 1 (containing compound A) can last for more than 5 hours in a garbage odor environment and for more than 4.5 hours in a smoke odor environment.

[0112] 2. The deodorizing effect of the test spray 2 (without compound A) lasted for about 3.5 hours in a garbage odor environment and about 3 hours in a smoke odor environment.

[0113] From the test results, we can see that compound A (HMB) has a significant synergistic effect in plant-based deodorizing sprays. In terms of odor removal rate, the spray containing compound A has a higher removal rate for garbage odor and smoke odor than the one without compound A. In terms of durability, compound A significantly prolongs the deodorizing time of the spray. In the environment of garbage odor and smoke odor, the deodorizing effect of the spray containing compound A lasts longer. Because the hydroxyl, methoxy and carbonyl groups in compound A form hydrogen bonds and other interactions with odor molecules, the odor molecules are fixed to prevent diffusion, thereby improving the odor removal effect and deodorization durability.

[0114] Example 4

[0115] Application of compound B (CPOAE) in plant-derived deodorizing spray

[0116] 1. Purpose of the test

[0117] The aim of this study was to investigate the synergistic effect of compound B (CPOAE) in a plant-based deodorizing spray, and to evaluate its effect on the odor removal efficacy and persistence compared with a spray without compound B.

[0118] 2. Test Materials

[0119] 1. Test spray 3: a plant-derived deodorizing spray prepared according to the preparation method described in the above invention content, comprising lemon eucalyptus leaf extract, rosemary extract, mint leaf extract, agarwood extract, ethanol, deionized water, Tween-80, propylene glycol, lavender essential oil and compound B (CPOAE),

[0120] The content of each ingredient is within the specified range.

[0121] 2. Test spray 4: Similar to test spray 3, but does not contain compound B (CPOAE) and the contents of other ingredients are adjusted accordingly.

[0122] 3. Test odor source:

[0123] 1. Kitchen odor simulation device: By heating 50 ml of cooking oil to 180°C in a sealed container and placing 100 g of chopped onions, 50 g of garlic and 200 g of leftovers and other food residues, the mixed gas of oil smoke and food odor generated by kitchen cooking is simulated.

[0124] 2. Sweat odor simulation device: collect the sweat odor from the armpits of 10 volunteers after exercise and seal them in a 500 ml sealed bag as the test odor source.

[0125] 3. Test methods

[0126] 1. Determination of odor removal rate:

[0127] 1. Spray different sprays on a volume of 1m 3 The test chamber is sealed and pre-filled with specific odorous gases (such as kitchen odor or sweat odor) to ensure that the spray is evenly distributed in the chamber.

[0128] 2. Use a professional gas chromatography-mass spectrometer to detect the concentration of odorous gases in the box before and 30 minutes after spraying, and calculate the odor removal rate. Repeat each sample 3 times.

[0129] 2. Durability test:

[0130] 1. After spraying the spray in the above test box, use gas chromatography-mass spectrometry to detect the odor gas concentration in the box every hour, observe the change of odor concentration over time, and determine the duration of the deodorization effect.

[0131] 4. Test results

[0132] 1. Odor removal rate test results:

[0133] 1. Removal rate of kitchen odor:

[0134] 1. The removal rate of test spray 3 (containing compound B) was 95%.

[0135] 2. The removal rate of the test spray 4 (containing no compound B) was 88%.

[0136] 2. Removal rate of sweat odor:

[0137] 1. The removal rate of test spray 3 (containing compound B) was 92%.

[0138] 2. The removal rate of the test spray 4 (containing no compound B) was 80%.

[0139] 2. Durability test results:

[0140] 1. Test spray 3 (containing compound B):

[0141] 1. In the odorous environment of the kitchen, the deodorizing effect can last for about 5 hours. During these 5 hours, the odor concentration gradually decreases from the initial high value and remains at a low level after 5 hours, with no obvious rebound of odor.

[0142] 2. In a sweat odor environment, it can last for about 4 hours. The sweat odor gradually fades in the first 4 hours, and although the sweat odor rises slightly after 4 hours, it is still significantly lighter than before treatment.

[0143] 2. Test spray 4 (without compound B):

[0144] 1. In the odorous environment of the kitchen, the deodorizing effect lasts for about 3 hours. The odor concentration decreases within 3 hours, but after 3 hours the odor begins to rise rapidly and is clearly smellable.

[0145] 2. In a sweaty environment, it lasts for about 2.5 hours. After 2.5 hours, the sweat odor quickly intensifies and approaches the initial odor intensity.

[0146] From the test results, it can be seen that compound B (CPOAE) has a significant synergistic effect in plant-based deodorizing sprays. In terms of odor removal rate, the spray containing compound B has a higher removal rate for kitchen odor and sweat odor than the one without compound B. In terms of durability, compound B significantly prolongs the deodorizing time of the spray. In the environment of kitchen odor and sweat odor, the deodorizing effect of the spray containing compound B lasts longer. This is because the ester group in compound B can undergo nucleophilic addition reaction with aldehyde and ketone odor molecules, and the cyclopentyloxy structure gives it stability and sustained release, thereby changing the chemical environment of the odor molecules, reducing their volatility, reducing odor emission and prolonging the duration of the deodorizing effect.

[0147] The plant-derived deodorizing spray of the present invention has a significant improvement in the deodorizing range and effect compared with a single plant-derived deodorizing spray due to the synergistic effect of multiple plant extracts and compounds, and has a good synergistic effect. Plant extracts and slow-release organic compounds work synergistically. Lemon eucalyptus extract, rosemary extract, mint leaf extract and agarwood extract each have a unique mechanism of action for different types of odor molecules. For example, lemon eucalyptus extract targets a variety of common odor molecules and microbial odor sources, and rosemary extract focuses on organic odor substances. Compound A (HMB) has a good binding effect on ammonia and thiol odor molecules, and compound B (CPOAE) can effectively treat aldehyde and ketone odor molecules. They cooperate with each other, from the source of odor generation microbial inhibition, odor molecular structure changes, odor molecule capture and neutralization to the targeted binding and fixation of specific types of odor molecules or chemical environment changes, etc., and show excellent removal effects on common odors such as kitchen fume, garbage odor, toilet odor, human sweat, smoke, and formaldehyde odor. Compared with traditional chemical synthetic deodorizers, the removal rate of kitchen cooking mixed odors can reach more than 95%, which is much higher than the 60%-70% of traditional air fresheners. This synergistic effect greatly broadens the deodorization range and enhances the deodorization ability. The addition of agarwood extract further enhances the overall deodorization effect. The active ingredients such as sesquiterpenoids and aromatic compounds contained in it act together with other plant extracts on odor molecules, changing the physical and chemical properties of odor molecules through adsorption and chemical reactions, making odor molecules easier to be processed by other ingredients or lose their own odor characteristics. At the same time, its unique aroma ingredients do not affect but assist the deodorization process in the process of soothing nerves and creating an elegant fragrance atmosphere, so that deodorization and fragrance creation are carried out in synergy. The four plant extracts each contribute to the persistence of deodorization and work together. Lemon eucalyptus extract reduces the generation and emission of odor from the root, the antioxidant properties of rosemary extract help to keep the air fresh for a long time, the volatile components of mint leaf extract continue to emit and the characteristics of combining with odor molecules and decomposing continue to play a role, and the characteristics of agarwood extract adsorbing odor molecules and lasting fragrance also help to remove odor for a long time. On this basis, compound A (HMB) can continuously bind to and fix odor molecules, and compound B (CPOAE) continuously reduces the volatility of odor molecules. The sustained release effect of the two is matched with the long-term effect of plant extracts, so that the deodorization effect can be maintained for a long time. Compared with the deodorization duration of only 1-2 hours of many existing plant-based deodorizing sprays, the deodorization effect of the spray of the present invention can last for more than 4-6 hours after one spray, which significantly reduces the trouble of frequent spraying and keeps the air environment fresh for a long time. Lavender essential oil cooperates with other plant extracts and compounds. Lavender essential oil not only has a unique aromatic smell, but also blends with the smell of lemon eucalyptus, rosemary, mint leaves, and agarwood to create a natural and soothing fragrance environment.This fragrance does not simply cover up the odor, but works synergistically with the entire deodorization process. When plant extracts and slow-release organic compounds are used to treat odor molecules, the fragrance components can help change the microenvironment around the odor molecules. For example, through intermolecular interactions, they affect the volatility and perception of odor molecules, making odor molecules easier to remove. At the same time, the air atmosphere remains fresh and pleasant during the odor reduction process, which improves the user's comfort and product experience, making the air purification process more comfortable, pleasant and efficient. The safety of plant extracts and compounds is synergistic. Plant extracts themselves are derived from natural plants, have good biocompatibility, and are non-irritating to the human respiratory tract, skin, eyes, etc. Compound A (HMB) and Compound B (CPOAE) are small organic molecule compounds. Their safety was fully considered during the design and synthesis, and they have no obvious toxicity or irritation. The synergy between the plant extract and the compound in terms of safety ensures that the spray of the present invention can ensure the health and safety of users when used in various environments such as homes, public places and cars. It is especially suitable for the elderly, children, pregnant women and people who are sensitive to chemical substances, providing a green, environmentally friendly and gentle solution for air purification, and enhancing the overall advantages and application scope of the product from a safety perspective.

Claims

1. A plant-derived deodorizing spray, characterized in that: The composition comprises the following components in parts by weight: 8-12 parts of lemon eucalyptus leaf extract; 6-9 parts of rosemary extract; 5-8 parts of peppermint leaf extract; 3-6 parts of agarwood extract; 20-30 parts of ethanol; 40-60 parts of deionized water; 1-3 parts of Tween-80; 3-6 parts of propylene glycol; 0.5-1 part of lavender essential oil.

2. The plant-derived deodorizing spray according to claim 1, characterized in that: The lemon eucalyptus leaf extract is prepared by a steam distillation method, comprising the following steps: collecting fresh lemon eucalyptus leaves, washing them, naturally drying them or drying them at low temperature, crushing them and placing them in a distillation device, adding an appropriate amount of water, heating and distilling them for 2-3 hours, collecting the volatile oil obtained by distillation, and drying them with anhydrous sodium sulfate to obtain the lemon eucalyptus leaf extract.

3. The plant-derived deodorizing spray according to claim 1, characterized in that: The rosemary extract is prepared by supercritical carbon dioxide extraction, comprising the following steps: taking dried rosemary plants, crushing them into fine powder, extracting them for 1-2 hours under the conditions of a pressure of 20-30 MPa and a temperature of 40-50° C., and separating the extract under reduced pressure to obtain the rosemary extract.

4. The plant-derived deodorizing spray according to claim 1, characterized in that: The mint leaf extract is prepared by an ultrasonic-assisted extraction method, comprising the following steps: picking fresh mint leaves, washing and freeze-drying, using ethanol as an extraction solvent, ultrasonically extracting for 30-45 minutes at an ultrasonic power of 200-300W, filtering the extract, and rotary evaporating and concentrating to obtain the mint leaf extract.

5. The plant-derived deodorizing spray according to claim 1, characterized in that: The agarwood extract is prepared by Soxhlet extraction and silica gel column chromatography purification, comprising the following steps: selecting high-quality agarwood, crushing it into fine powder, adopting Soxhlet extraction, using a mixed solvent of n-hexane and ethyl acetate in a volume ratio of 4:1 as an extraction solvent, extracting at 60-80°C for 4-6 hours, rotary evaporation to remove the solvent, obtaining a crude agarwood extract, and then purifying the crude extract by silica gel column chromatography, using a mixed solvent of petroleum ether-acetone in different proportions as an eluent, collecting fractions containing the target active ingredient, and obtaining the agarwood extract after vacuum drying.

6. The plant-derived deodorizing spray according to claim 1, characterized in that: The compound A also includes 2-4 parts of 3-hydroxy-4-methoxy-2-butanone and the compound B includes 1.5-3 parts of ethyl 2-cyclopentyloxyacetate.

7. The plant-derived deodorizing spray according to claim 1, characterized in that: The compound A is prepared by using 3-hydroxy-2-butanone as a raw material and reacting it with methyl iodide under alkaline conditions. After preparation, it is mixed with an appropriate amount of ethanol and treated under ultrasonic conditions for 15-20 minutes to fully and evenly disperse it to form a stable dispersion for use.

8. The plant-derived deodorizing spray according to claim 1, characterized in that: The compound B is prepared by esterification reaction of cyclopentanol and ethyl chloroacetate under the action of an alkaline catalyst, and then dissolved in a small amount of propylene glycol, heated to 40-50° C. and stirred to completely dissolve the compound B to form a uniform solution for use.

9. A method for preparing the plant-derived deodorizing spray according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: preparing lemon eucalyptus leaf extract, rosemary extract, mint leaf extract, agarwood extract, compound A dispersion and compound B solution respectively; S2: The prepared lemon eucalyptus extract, rosemary extract, mint leaf extract and agarwood extract are mixed with ethanol, deionized water, Tween-80, propylene glycol, lavender essential oil and the treated compound A dispersion and compound B solution in a prescribed proportion, and the plant extracts are first dissolved in an appropriate amount of ethanol, fully dissolved under stirring conditions, and then Tween-80, propylene glycol, lavender essential oil, compound A dispersion, compound B solution and deionized water are added in sequence, and stirred in a stirrer at a speed of 300-500 rpm for 20-30 minutes until a uniform and stable spray solution is formed; S3: Filter the prepared spray solution through a 0.22 μm microporous filter membrane to remove impurities, insoluble particles and possible microorganisms in the solution to obtain a finished plant-based deodorizing spray, which is then packaged in spray bottles.

10. Use of the plant-derived deodorizing spray according to any one of claims 1 to 7 in air purification, for removing odors in homes, public places or car interiors.