Method for testing deodorizing effect of daily chemical washing product by simulating taste of old people with 2-nonenal

Abstract

The invention relates to the field of detection of daily chemical products, in particular to a method for testing the deodorizing effect of a daily chemical washing product by simulating the taste of old people by using 2-nonenal, which comprises the following steps: dissolving 2-nonenal in an organic solvent to prepare a solution with a certain concentration, applying the solution to a carrier matched with a product applicable object to prepare a carrier for simulating the taste of old people, treating the carrier by using a product according to a conventional method, extracting 2-nonenal in the treated carrier by using an organic solvent, detecting the residual quantity by using a gas chromatograph-mass spectrometer, and finally calculating the removal rate according to the residual quantity of a blank control group and a treatment group. According to the invention, the purpose of accurately and scientifically testing the odor removal effect of the daily chemical washing product on the simulated odor of the elderly is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of daily chemical products, in particular to a method for testing the deodorizing effect of daily chemical washing products by simulating the smell of old people using 2-nonene aldehyde. BACKGROUND

[0002] With the improvement of people's living standards, the market demand for daily chemical washing products is growing, and their functions are becoming increasingly diversified. Deodorization is one of the important functions of daily chemical washing products, especially the removal of some special odors, which has attracted more and more attention from consumers. As a special odor, the generation of old people's smell is related to many factors such as human physiological changes, and the accurate evaluation of the deodorizing effect of daily chemical washing products on old people's smell becomes increasingly important. This not only relates to the quality and market competitiveness of products, but also meets the needs of consumers for improving the quality of life. The daily chemical washing industry has been continuously exploring more scientific and effective deodorizing effect testing methods to promote product innovation and development.

[0003] Before the present technical solution, there are various means commonly used for testing the deodorizing effect of daily chemical washing products. One common method is sensory evaluation, which organizes professional olfactory evaluators to judge the smell of the items after washing, and evaluates the deodorizing effect of the products according to subjective feelings. This method depends on the experience and olfactory sensitivity of the evaluators. Another method is to use some common odorants to simulate specific odors, such as using common spices or malodorous compounds, applying them on a carrier, and then observing the removal of these simulated odors by washing products. Another way is to analyze the content changes of some specific odor components, but this method is not specifically aimed at old people's smell.

[0004] However, these existing testing methods have obvious defects. The sensory evaluation method has large subjective differences, and the judgment results of different evaluators may not be consistent, resulting in low accuracy and reliability of the test results. The method of using common odorants to simulate specific odors cannot accurately reflect the real deodorizing effect of daily chemical washing products on old people's smell, because the simulated odor differs from the actual old people's smell in composition and characteristics. The existing chemical analysis method is not specifically aimed at old people's smell, and cannot effectively evaluate the product's ability to remove old people's smell. SUMMARY

[0005] In order to solve the above problems, the present application provides a method for testing the deodorizing effect of daily chemical washing products by simulating the smell of old people using 2-nonene aldehyde. The method provided by the present application simulates the smell of old people using 2-nonene aldehyde to test the deodorizing effect of daily chemical washing products, which adopts the following technical solution: A method for testing the deodorizing effect of daily chemical washing products by simulating the smell of old people using 2-nonene aldehyde, comprising the following steps: (1) Sample preparation: Dissolve 2-nonenal in an organic solvent to prepare a solution with a concentration of 0.1-5 mg / mL, and use the solution immediately or store it at 4°C for no more than 72 hours; (2) Preparation of simulated old man smell carrier: Select a carrier that matches the target object of the product, uniformly apply the 2-nonenal solution to the surface of the carrier, and place it at 25-40°C and a relative humidity of 40-60% for 2-5 hours; (3) Product treatment: Treat the simulated old man smell carrier according to the regular use method of the product; (4) 2-nonenal residual amount detection: Extract the 2-nonenal from the treated carrier using an organic solvent, and detect the residual amount by gas chromatography-mass spectrometry; (5) Result calculation: Calculate the removal rate based on the 2-nonenal residual amounts of the blank control group and the treatment group.

[0006] By adopting the above technical solution, 2-nonenal is used as the characteristic component of old man smell, and a standardized test method is established, effectively solving the key problems in the prior art such as the inconsistency between the test target and the actual old man smell components, and the poor repeatability of subjective evaluation methods. The method processes the carrier through a simulated real use scenario and uses a standardized operation process, so that the test results are highly consistent with the actual application effect; the gas chromatography-mass spectrometry technology is used for quantitative detection, which significantly improves the objectivity and accuracy of the test; at the same time, by controlling the experimental conditions and setting parallel experiments, the repeatability and reliability of the test results are ensured. The core mechanism is that 2-nonenal, as the main characteristic substance of old man smell, can truly reflect the removal effect of the product on old man smell; the organic solvent extraction combined with the GC-MS detection technology can accurately quantify the residual amount; the standardized carrier treatment and use method simulate the actual application scenario, making the test results more valuable.

[0007] Optionally, the concentration of the 2-nonenal ethanol solution in step (1) is 0.5-2 mg / mL.

[0008] By adopting the above technical solution, this concentration range not only ensures the effective loading amount of 2-nonenal on the carrier, so that it can fully simulate the concentration level of real old man smell, but also avoids the problems of signal saturation caused by too high concentration or insufficient detection sensitivity caused by too low concentration. Within this concentration range, 2-nonenal can form a stable adsorption state with the carrier material, truly reproducing the attachment characteristics of old man smell substances in actual use scenarios. At the same time, this concentration range matches the detection linear range of the gas chromatography-mass spectrometry instrument, which can ensure the accuracy and repeatability of the detection results, providing a reliable data basis for subsequent removal rate calculation.

[0009] Optionally, the carrier in step (2) is selected from at least one of pure cotton fabric and artificial skin simulation material.

[0010] By employing the aforementioned technical solution and selecting pure cotton fabric and artificial skin-simulating materials as carriers, the deodorization environment of daily chemical products in actual use scenarios can be highly replicated. Pure cotton fabric, due to its porous fiber structure and excellent adsorption properties, can simulate the adhesion state of odor-causing substances on clothing; while artificial skin-simulating materials can accurately reproduce the lipid environment and odor-causing substance binding characteristics of human skin. These two carrier materials not only have good compatibility with 2-nonenal, enabling stable loading of characteristic odor molecules, but more importantly, their surface properties highly match real-world usage scenarios, ensuring that the interaction mechanism between the washing product and odor-causing substances during testing is consistent with actual application. This carrier selection strategy effectively solves the problem of the disconnect between carriers and actual application scenarios in traditional testing methods, enabling test results to truly reflect the actual deodorization effect of the product during clothing washing or skin cleaning, providing a reliable experimental basis for product performance evaluation.

[0011] Optionally, the amount of 2-nonenal solution applied in step (2) is 5-10 μL / cm. 2 .

[0012] By adopting the above technical solution, the application amount of 2-nonenal solution is controlled at 0.1-1 mL / 100 cm³. 2 The specific range of carrier surface area accurately simulates the distribution of odor-causing substances actually produced by the human body on the carrier surface. This application range ensures that 2-nonenal forms a uniform and representative odor molecular layer on the carrier surface while avoiding solution penetration or localized aggregation caused by excessive application. Within this optimized range, odor molecules can form appropriate physical adsorption and chemical binding with the carrier material, realistically reproducing the actual adhesion concentration and distribution characteristics of odor-causing substances on clothing or skin surfaces. This application method ensures sample consistency and makes the deodorization process closer to actual use scenarios, enhancing the data reference value.

[0013] Optionally, the product processing method in step (3) includes: For laundry products: Prepare a detergent solution with a mass fraction of 0.5-2%, a liquor ratio of 25-35:1, and a washing time of 10-30 minutes; For bath products: Apply the product directly and rub for 1-5 minutes before rinsing.

[0014] By adopting the above technical solutions, for laundry products, a detergent concentration of 0.5-2% and a liquor ratio of 25-35:1 can accurately reproduce the solution environment during home washing, ensuring full contact between the detergent and odor substances; the 10-30 minute washing time fully covers the entire process from soaking to stain removal. For bath products, the 1-5 minute rubbing time simulates the actual friction during human cleansing, making the test conditions highly consistent with the skin cleansing process. This differentiated treatment method fully considers the usage characteristics of different product categories, ensuring that the interaction mechanism between the active detergent ingredients and 2-nonenal during the test is completely consistent with actual applications, avoiding data distortion caused by over-processing and preventing decreased test sensitivity due to under-processing.

[0015] Optionally, in step (4), the organic solvent is selected from at least one of n-hexane and dichloromethane, and the extraction conditions are ultrasonic extraction at 25-40°C for 10-30 minutes.

[0016] By employing the above-mentioned technical solution, hexane and dichloromethane, with their excellent lipophilicity, can effectively dissolve 2-nonenal molecules bound to the carrier. Simultaneously, their low polarity avoids the co-extraction of other interfering substances during the extraction process. A mild extraction temperature of 25-40℃ ensures the full release of 2-nonenal while preventing decomposition or volatilization loss of the target compound due to high temperatures. An ultrasonic extraction time of 10-30 minutes significantly improves mass transfer efficiency through cavitation, bringing the transfer of 2-nonenal from the carrier surface to the solvent closer to thermodynamic equilibrium. This optimized extraction system not only ensures the recovery rate of the target compound but, more importantly, maintains the chemical stability of 2-nonenal, providing a reliable sample basis for subsequent GC-MS detection, thus ensuring that the test results accurately reflect the actual deodorization effect of the product.

[0017] Optionally, the detection conditions for the gas chromatography-mass spectrometry (GC-MS) instrument in step (4) include: Chromatographic column: DB-5MS capillary column, 30m × 0.25mm × 0.25μm; Carrier gas: Helium, flow rate 0.8-1.2 mL / min; Heating program: Initial temperature 40-60℃, hold for 0.5-2 minutes, increase to 200-250℃ at 5-10℃ / min, hold for 3-10 minutes; Ion source: EI source, scanning range 30-300 amu.

[0018] By employing the above technical solution, the DB-5MS capillary column, combined with an optimized temperature program, achieves efficient separation of 2-nonenal. The selection of helium carrier gas and EI ion source ensures high sensitivity and stability of detection, while the 30-300 amu scanning range covers the characteristic ion fragments of the target analyte. This scientific combination of detection conditions optimizes the qualitative and quantitative analysis of 2-nonenal, providing an accurate data basis for removal rate calculation. The removal rate calculation formula objectively reflects the actual deodorization efficiency of the product by comparing the difference in residual amounts before and after treatment. Its relative percentage expression eliminates systematic errors, making different test results comparable. This technical solution forms a complete closed loop from detection method to data processing, achieving a leap from qualitative evaluation to precise quantification of odor removal effects, providing reliable technical support for the research and development and quality control of daily chemical products.

[0019] Optionally, the formula for calculating the removal rate in step (5) is: Removal rate (%) = (Residual amount in blank group - Residual amount in treatment group) / Residual amount in blank group × 100%.

[0020] By employing the above technical solution, the actual removal capacity of daily chemical products for characteristic odor substances is accurately reflected by comparing the difference in the residual amount of 2-nonenal on the carrier before and after treatment. The core mechanism is that the residual amount in the blank group represents the initial load, while the residual amount in the treated group characterizes the remaining amount after the product's action; the difference between the two directly reflects the product's deodorizing efficacy. This relative percentage expression not only eliminates systematic errors caused by carrier differences and fluctuations in initial load but also achieves comparability of test results from different products and batches. This calculation method fully considers various variable factors in the actual testing process, and through normalization, it improves the reproducibility and comparability of the test results, providing a standardized basis for the objective evaluation of product performance and significantly enhancing the scientific rigor and practicality of the testing method.

[0021] In summary, this application has the following beneficial effects: 1. This invention innovatively uses 2-nonenal, a characteristic component of elderly body odor, as a simulation reagent. Compared with the use of irrelevant substances or non-specific body odor substances such as formaldehyde and benzene series in the prior art, it can accurately simulate the smell of the elderly, greatly improving the correlation between the test results and the actual effect of removing the smell of the elderly. It is specifically designed for the testing needs of products that remove the smell of the elderly and solves the problem of insufficient targeting of existing methods.

[0022] 2. In this application, gas chromatography-mass spectrometry (GC-MS) is used to quantitatively detect the residue of 2-nonenal, which completely eliminates the subjective judgment of human sensory evaluation, is not affected by individual differences of evaluators and environmental factors, and the detection results are more objective and accurate, overcoming the defects of strong subjectivity of human evaluation.

[0023] 3. The method of this application, by calculating the removal rate of 2-nonenal, achieves a quantitative evaluation of the effect of removing odor from elderly people. It can accurately quantify the differences in the effects of different products, providing quantifiable data support for formula optimization and process improvement in product development, and solving the problem that existing methods are difficult to quantify.

[0024] 4. The carrier used in this application is matched with the target users of the product, and the processing method follows the conventional usage method of the product, making the test scenario closer to the actual application situation. The test results can more realistically reflect the product's effect on removing the smell of the elderly in actual use, and have higher practical value. This avoids the problem of distorted results caused by the disconnect between the test conditions and reality in some existing methods.

[0025] 5. The method of this application establishes a test system specifically for the removal of odor from elderly people, with 2-nonenal as the core. It forms a complete closed loop from reagents to detection, providing a unified standard for the test of the removal effect of odor from elderly people in daily chemical washing products. This facilitates product development, quality control and market supervision, and fills the gap in the existing technology of lacking a standard method system specifically for testing odor from elderly people. Detailed Implementation

[0026] The following detailed description of this application is provided in conjunction with the embodiments. It should be noted that: unless otherwise specified, the conditions in the following embodiments are performed under conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following embodiments are all from commercially available sources. Example

[0027] Example 1 A method for testing the deodorizing effect of daily chemical detergents using 2-nonenal to simulate the smell of elderly people includes the following steps: (1) Dissolve 2-nonenal in anhydrous ethanol and stir magnetically for 15 min to prepare a 2-nonenal ethanol solution with a concentration of 1 mg / mL. (2) Pure cotton white cloth was selected as the carrier and cut into small pieces of 5×5cm, each piece weighing 2.0g. The cotton cloth was washed 3 times with distilled water at 30℃ and then dried in an oven at 40℃ until constant weight. 0.2mL of 2-nonenal ethanol solution was pipetted and evenly added to the surface of the cotton cloth in 3 points. The cotton cloth was placed in a constant temperature and humidity chamber and placed for 2 hours at 30℃ and 50% relative humidity to obtain a cotton cloth carrier that simulates the smell of the elderly. (3) Prepare a 0.5% (w / w) washing solution by adding water to the laundry detergent. Place the simulated elderly-smelling cotton carrier into the washing solution and put it in an RHLQⅢ type stain remover. Wash for 20 minutes at a speed of 120 r / min and a bath ratio of 30:1. After washing, rinse four times with distilled water, each time using 80 times the mass of the carrier, until the surface tension difference between the rinsing solution and the distilled water is ≤2 mN / m. Then dry in a 40℃ oven to constant weight. At the same time, set up three blank control samples, which are not washed and are also dried to constant weight. (4) Cut the treated cotton cloth and the blank control group cotton cloth into 1cm×1cm fragments, weigh 1.000g of each and put them into a 50mL extraction bottle. Add 10mL of n-hexane and ultrasonically extract at 30℃ and 300W power for 20 minutes, shaking once every 5 minutes. After the extract has stood, take the supernatant and filter it through a 0.22μm organic phase filter membrane. Detect it by GC-MS. GC-MS detection conditions: chromatographic column: DB-5MS capillary column (30m×0.25mm×0.25μm); carrier gas: helium, flow rate: 1.0mL / min; injection port temperature: 230℃; split ratio: 10:1; temperature program: initial temperature 50℃, hold for 1 minute, increase to 220℃ at a rate of 8℃ / min, hold for 5 minutes; ion source: EI source, ion source temperature: 230℃, scan range: 30-300amu. (5) Result calculation: Removal rate = (Residual amount in blank group - Residual amount in treatment group) / Residual amount in blank group × 100%.

[0028] Example 2 A method for testing the deodorizing effect of daily chemical detergents using 2-nonenal to simulate the smell of elderly people includes the following steps: (1) Dissolve 2-nonenal in anhydrous ethanol and stir magnetically for 15 min to prepare a 2-nonenal ethanol solution with a concentration of 0.5 mg / mL. (2) Pure white cotton cloth was selected as the carrier and cut into small pieces of 5×5cm, each weighing 2.0g. The cotton cloth was washed three times with distilled water at 30℃ and then dried in an oven at 40℃ until constant weight. 0.125mL of 2-nonenal ethanol solution was pipetted and evenly added to the surface of the cotton cloth in three points. The cotton cloth was placed in a constant temperature and humidity chamber and placed for 2 hours at 25℃ and 60% relative humidity to obtain a cotton cloth carrier that simulates the smell of the elderly. (3) Prepare a 2% (w / w) washing solution by adding water to the laundry detergent. Place the cotton carrier simulating an elderly person's smell into the washing solution and put it in an RHLQⅢ type stain remover. Wash for 20 minutes at a speed of 120 r / min with a bath ratio of 25:1. After washing, rinse four times with distilled water, each time using 80 times the mass of the carrier, until the surface tension difference between the rinsing solution and the distilled water is ≤2 mN / m. Then dry in a 40℃ oven to constant weight. At the same time, set up three blank control samples, which are not washed and are also dried to constant weight. (4) Cut the treated cotton cloth and the blank control group cotton cloth into 1cm×1cm fragments, weigh 1.000g of each and put them into a 50mL extraction bottle. Add 10mL of n-hexane and ultrasonically extract at 40℃ and 300W for 10 minutes, shaking once every 5 minutes. After the extract has stood, take the supernatant and filter it through a 0.22μm organic phase filter membrane. Detect it by GC-MS. GC-MS detection conditions: chromatographic column: DB-5MS capillary column (30m×0.25mm×0.25μm); carrier gas: helium, flow rate: 0.8mL / min; injection port temperature: 230℃; split ratio: 10:1; temperature program: initial temperature 40℃, hold for 2 minutes, increase to 200℃ at a rate of 5℃ / min, hold for 10 minutes; ion source: EI source, ion source temperature: 230℃, scan range: 30-300amu. (5) Result calculation: Removal rate = (Residual amount in blank group - Residual amount in treatment group) / Residual amount in blank group × 100%.

[0029] Example 3 A method for testing the deodorizing effect of daily chemical detergents using 2-nonenal to simulate the smell of elderly people includes the following steps: (1) Dissolve 2-nonenal in anhydrous ethanol and stir magnetically for 15 min to prepare a 2-nonenal ethanol solution with a concentration of 2 mg / mL. (2) Pure cotton white cloth was selected as the carrier and cut into small pieces of 5×5cm, each piece weighing 2.0g. The cotton cloth was washed 3 times with distilled water at 30℃ and then dried in an oven at 40℃ until constant weight. 0.25mL of 2-nonenal ethanol solution was pipetted and evenly added to the surface of the cotton cloth in 3 points. The cotton cloth was placed in a constant temperature and humidity chamber and placed for 5 hours at 40℃ and 40% relative humidity to obtain a cotton cloth carrier that simulates the smell of the elderly. (3) Prepare a 1% (w / w) washing solution by adding water to the laundry detergent. Place the cotton carrier simulating an elderly person's smell into the washing solution and put it in an RHLQⅢ type stain remover. Wash for 30 minutes at a speed of 120 r / min with a bath ratio of 35:1. After washing, rinse four times with distilled water, each time using 80 times the mass of the carrier, until the surface tension difference between the rinsing solution and the distilled water is ≤2 mN / m. Then dry in a 40℃ oven to constant weight. At the same time, set up three blank control samples, which are not washed and are also dried to constant weight. (4) Cut the treated cotton cloth and the blank control group cotton cloth into 1cm×1cm fragments, weigh 1.000g of each and put them into a 50mL extraction bottle. Add 10mL of n-hexane and ultrasonically extract at 25℃ and 300W for 30 minutes, shaking once every 5 minutes. After the extract has stood, take the supernatant and filter it through a 0.22μm organic phase filter membrane. Detect it by GC-MS. GC-MS detection conditions: chromatographic column: DB-5MS capillary column (30m×0.25mm×0.25μm); carrier gas: helium, flow rate: 0.8mL / min; injection port temperature: 230℃; split ratio: 10:1; temperature program: initial temperature 60℃, hold for 0.5 minutes, increase to 250℃ at a rate of 10℃ / min, hold for 3 minutes; ion source: EI source, ion source temperature: 230℃, scan range: 30-300amu. (5) Result calculation: Removal rate = (Residual amount in blank group - Residual amount in treatment group) / Residual amount in blank group × 100%.

[0030] Example 4 A method for testing the deodorizing effect of daily chemical detergents using 2-nonenal to simulate the smell of the elderly differs from Example 1 in that this example uses artificial skin-simulating material as a carrier to test the deodorizing effect of shower gel, as detailed below: (2) Cut the artificial skin simulation material into small pieces of 8×8cm, and set them aside after deodorization treatment; use a pipette to draw 0.5mL of 2-nonenal ethanol solution, spread it evenly on the surface of the artificial skin simulation material, place it in a constant temperature and humidity chamber, and place it for 2 hours at 30℃ and 50% relative humidity to obtain an artificial skin carrier that simulates the smell of the elderly. (3) Apply 80mg of shower gel to the artificial skin carrier that simulates the smell of the elderly, gently rub for 3 minutes, rinse with distilled water at 30℃, and dry at 40℃; set up a blank control group, that is, the artificial skin carrier that simulates the smell of the elderly without applying shower gel, rinsed with distilled water for the same time and then dried. (4) Cut the treated artificial skin carrier and blank control group carrier into 1cm×1cm fragments, weigh 1.000g of each and put them into a 50mL extraction bottle, add 5mL of dichloromethane, and extract by ultrasonication at 35℃ and 300W for 15 minutes; the remaining steps are the same as in Example 1.

[0031] Comparative Example Comparative Example 1 A method for testing the deodorizing effect of daily chemical detergents employs a human sensory evaluation method. Ratings trained in olfactory skills are recruited to conduct blind tests on cotton fabrics before and after washing. Each group consists of 10 people, and the average value is taken. The rating standard ranges from 0 (no elderly smell) to 10 (strong elderly smell). Odor removal effect (%) = (Initial average score - Average score after washing) / Initial average score × 100%.

[0032] Comparative Example 2 A method for testing the deodorizing effect of daily chemical detergents by simulating the smell of the elderly using 2-nonenal is different from Example 1 in that ethanol is used as the extraction liquid in this comparative example, and the extraction is carried out at room temperature for 60 minutes; the remaining operation steps are the same as in Example 1.

[0033] Performance testing Detection methods / test methods Relative standard deviation (RSD, %): The relative standard deviation was calculated by performing three consecutive measurements for each group according to the method shown in this application; Detection limit: The detection limit was determined using the signal-to-noise ratio method (S / N = 3).

[0034] Table 1 Test Results Removal rate / % RSD / % Limit of detection (ng / g) Example 1 85.3±2.1 2.8 5 Example 2 84.6±1.9 3.5 5 Example 3 84.9±2.5 3.2 5 Example 4 80.6±2.8 4.1 8 Comparative Example 1 - 28.6 - Comparative Example 2 68.9±12.7 18.4 50 As can be seen from Examples 1-3 and Comparative Example 1, and in conjunction with Table 1, Comparative Example 1 employed a human sensory evaluation method, recruiting olfactory-trained raters to conduct blind tests on cotton fabrics before and after washing. This method is highly subjective and susceptible to individual differences among raters and olfactory fatigue, resulting in a high RSD and failing to provide specific removal rate values.

[0035] Based on Examples 1-3 and Comparative Example 1, and in conjunction with Table 1, it can be seen that Comparative Example 2 uses ethanol as the extraction solvent and is extracted at room temperature for 60 minutes. Compared with Example 1, the extraction efficiency and selectivity are lower, resulting in a higher detection limit and a larger RSD. Selecting appropriate extraction solvents and extraction conditions is crucial for improving detection accuracy and sensitivity.

[0036] By combining Examples 1 and 4, the method of this application can be used to test the deodorizing effect of various detergent products, and the data is intuitive and reliable.

[0037] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A method for testing the deodorizing effect of daily chemical detergents using 2-nonenal to simulate the smell of elderly people, characterized in that, The method includes the following steps: (1) Sample preparation: Dissolve 2-nonenal in an organic solvent to prepare a solution. The solution should be prepared and used immediately or stored at 4°C for no more than 72 hours. (2) Preparation of carrier to simulate the smell of the elderly: Select a carrier that matches the target audience of the product, apply 2-nonenal solution evenly to the surface of the carrier, and place it at 25-40℃ and 40-60% relative humidity for 2-5 hours. (3) Product processing: Process the carrier that simulates the smell of the elderly according to the product's regular usage method; (4) Detection of 2-nonenal residue: The 2-nonenal in the carrier was extracted with organic solvent and the residue was detected by gas chromatography-mass spectrometry. (5) Results calculation: The removal rate was calculated based on the residual amount of 2-nonenal in the blank control group and the treatment group.

2. The method for testing the deodorizing effect of daily chemical detergents using 2-nonenal to simulate the smell of the elderly, as described in claim 1, is characterized in that: In step (1), 2-nonenal is dissolved in ethanol to prepare a 2-nonenal ethanol solution with a concentration of 0.5-2 mg / mL.

3. The method for testing the deodorizing effect of daily chemical detergents using 2-nonenal to simulate the smell of the elderly, as described in claim 1, is characterized in that: The carrier in step (2) is selected from at least one of pure cotton fabric and artificial skin simulation material.

4. The method for testing the deodorizing effect of daily chemical detergents using 2-nonenal to simulate the smell of the elderly, as described in claim 1, is characterized in that: In step (2), the amount of 2-nonenal solution applied is 5-10 μL / cm².

5. The method for testing the deodorizing effect of daily chemical detergents using 2-nonenal to simulate the smell of the elderly, as described in claim 1, is characterized in that... The product processing methods in step (3) include: For laundry products: Prepare a detergent solution with a mass fraction of 0.5-2%, a liquor ratio of 25-35:1, and a washing time of 10-30 minutes; For bath products: Apply the product directly and rub for 1-5 minutes, then rinse.

6. The method for testing the deodorizing effect of daily chemical detergents using 2-nonenal to simulate the smell of the elderly, as described in claim 1, is characterized in that: In step (4), the organic solvent is selected from at least one of n-hexane and dichloromethane, and the extraction conditions are ultrasonic extraction at 25-40℃ for 10-30 minutes.

7. The method for testing the deodorizing effect of daily chemical detergents using 2-nonenal to simulate the smell of the elderly, as described in claim 1, is characterized in that: The detection conditions for the gas chromatography-mass spectrometry (GC-MS) instrument in step (4) include: Chromatographic column: DB-5MS capillary column, 30m × 0.25mm × 0.25μm; Carrier gas: Helium, flow rate 0.8-1.2 mL / min; Heating program: Initial temperature 40-60℃, hold for 0.5-2 minutes, increase to 200-250℃ at 5-10℃ / min, hold for 3-10 minutes; Ion source: EI source, scanning range 30-300 amu.

8. The method for testing the deodorizing effect of daily chemical detergents using 2-nonenal to simulate the smell of the elderly, as described in claim 1, is characterized in that: The formula for calculating the removal rate in step (5) is as follows: Removal rate (%) = (Residual amount in blank group - Residual amount in treatment group) / Residual amount in blank group × 100%.