Pseudo-scalp odor composition

Abstract

To provide a pseudo-scalp odor composition that is similar to the scalp odor of females in their 40s who sense body odor changes caused by aging, and which enables simple evaluation of masking or deodorizing effects on the scalp odor, and also to provide a method for evaluating masking or deodorizing effects on scalp odor using the pseudo-scalp odor composition.SOLUTION: A pseudo-scalp odor composition comprises a C4 aldehyde, a C5 aldehyde, and a C8-10 fatty acid, where the ratio (volume / volume) of the content of the C8-10 fatty acid to the combined content of the C4 aldehyde and the C5 aldehyde is 3 to 300.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a scalp odor mimicking composition and a method for evaluating the scalp odor masking effect or deodorizing effect using the scalp odor mimicking composition. The present invention also relates to an indicator for determining scalp odor, a method for determining scalp odor, and a scalp odor determining device. [Background technology]

[0002] In recent years, awareness of odors caused by humans has increased. Odors caused by humans include body odors that are emitted directly from the human body and odors that are emitted indirectly from clothes and shoes worn by the person. In particular, attention has been focused on body odors emitted from the human body, and various body odor suppressants are commercially available. Many simulated body odor compositions used to evaluate these body odor suppressants have been reported (Patent Documents 1 to 8). In particular, Patent Documents 4 to 8 disclose simulated scalp odor compositions for adults and children that focus on the changes in scalp odor between adults and children. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-263102 A [Patent Document 2] JP 2004-309455 A [Patent Document 3] JP 2005-62159 A [Patent Document 4] JP 2011-184469 A [Patent Document 5] JP 2011-184470 A [Patent Document 6] JP 2011-184471 A [Patent Document 7] JP 2011-184472 A [Patent Document 8] JP 2011-184473 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, these documents do not mention the difference in scalp odor due to gender. And, the change in body odor due to aging occurs not only in men but also in women, and there are many women in their 40s who feel the change in body odor. The present inventors have focused on the change in body odor due to aging in women, and by evaluating the characteristics of the body "odor" of women in their 40s who feel that their body odor has changed due to aging, they have clarified that the change in body odor is mainly caused by the change in scalp odor, and that the change in scalp odor is a change in which a sweat-like odor is added to the scalp odor. From this, it is believed that by finding a composition (pseudo scalp odor composition) that is similar to the above scalp odor, it will lead to the development of a body odor suppressant (especially a scalp odor suppressant) for women in their 40s.

[0005] Therefore, an object of the present invention is to provide a scalp odor mimicking composition that is similar to scalp odor including sweat-like odor and can easily evaluate the scalp odor masking effect, deodorizing effect, etc. Another object of the present invention is to provide a method for evaluating the scalp odor masking effect or deodorizing effect using the scalp odor mimicking composition. [Means for solving the problem]

[0006] In view of the above circumstances, as a result of intensive research to solve the problem, the present inventors have succeeded in finding characteristic components by analyzing scalp odor components of women in their 40s who feel that their body odor has changed with age, and have completed the present invention. In addition, they have also found that the above components can be used as indicators for determining scalp odor.

[0007] That is, the present invention provides an artificial scalp odor composition containing an aldehyde having 4 carbon atoms, an aldehyde having 5 carbon atoms, and a fatty acid having 8 to 10 carbon atoms, wherein the ratio (volume / volume) of the content of the fatty acid having 8 to 10 carbon atoms to the content of the aldehyde having 4 carbon atoms and the aldehyde having 5 carbon atoms is 3 to 300.

[0008] It is preferable that the artificial scalp odor composition further contains at least one selected from the group consisting of nonane, 2-butanone, and diacetyl.

[0009] The present invention also provides a method for evaluating the scalp odor masking effect or deodorizing effect of using the artificial scalp odor composition.

[0010] The present invention also provides an indicator for determining scalp odor, which is used as an indicator for determining scalp odor, and which contains an aldehyde having 4 carbon atoms, an aldehyde having 5 carbon atoms, and a fatty acid having 8 to 10 carbon atoms, and in which the ratio (volume / volume) of the content of the fatty acid having 8 to 10 carbon atoms to the content of the aldehyde having 4 carbon atoms and the aldehyde having 5 carbon atoms is 3 to 300.

[0011] It is preferable that the indicator for determining scalp odor further contains at least one selected from the group consisting of nonane, 2-butanone, and diacetyl.

[0012] The present invention also provides a method for determining scalp odor, which comprises measuring the amount of an indicator for determining scalp odor contained in a measurement sample and judging the quality of the scalp odor.

[0013] The present invention also provides a scalp odor assessment device comprising a means for measuring the amount of an indicator for determining scalp odor contained in a measurement sample, and a means for assessing the quality of the scalp odor. Effect of the Invention

[0014] The artificial scalp odor composition of the present invention is similar to the scalp odor, including the sweat-like odor, of women in their 40s who feel that their body odor has changed with age, and therefore, by using this composition, it is possible to easily evaluate the scalp odor masking effect and deodorizing effect. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] [Artificial scalp odor composition] The artificial scalp odor composition of the present invention is characterized in that it contains an aldehyde having 4 carbon atoms, an aldehyde having 5 carbon atoms, and a fatty acid having 8 to 10 carbon atoms, and the ratio (volume / volume) of the content of the fatty acid having 8 to 10 carbon atoms to the content of the aldehyde having 4 carbon atoms and the aldehyde having 5 carbon atoms is 3 to 300.

[0016] The artificial scalp odor composition of the present invention, by containing the above-mentioned components, has an "odor" similar to the scalp odor including sweat-like odor, which is the scalp odor of women in their 40s who feel that their body odor has changed with age. This "odor" can be mainly explained by the sweat-like odor and scalp odor-like odor characteristic of the scalp odor of women in their 40s who feel that their body odor has changed with age. In this specification, these properties are described as the "quality" of the scalp odor. In other words, "high quality as a scalp odor" refers to a simulated scalp odor composition that combines the sweat-like odor and scalp odor-like odor characteristic of the scalp odor of women in their 40s who feel that their body odor has changed with age. In this specification, the "strength" of the scalp odor refers to the strength of the odor, and "high strength as a scalp odor" refers to a strong scalp odor.

[0017] Examples of the aldehyde having 4 carbon atoms include butanal, 2-methylpropanal, and 2-butenal, and from the viewpoint of the quality of the scalp odor, butanal is preferred. These aldehydes having 4 carbon atoms may be used alone or in combination.

[0018] The content of the aldehyde having 4 carbon atoms is not particularly limited, but may be, for example, 1.0×10 -4 ~5.0×10 -1 % by volume, and more preferably 5.0×10 -4 ~2.0×10 -1 % by volume, more preferably 2.0×10 -3 ~2.0×10 -2 The volume percent is 1.0 x 10 -4 % by volume or more, there is a tendency for the sweat-like odor characteristic of the scalp of women in their 40s who feel that their body odor has changed with age to become stronger.-1 By adjusting the volume percentage to 0.05 or less, the scalp odor tends to be improved. In this specification, the volume percentage is measured or calculated at 30°C.

[0019] Examples of the aldehyde having 5 carbon atoms include 3-methylbutanal, pentanal, and 2-methylbutanal, and from the viewpoint of the quality of the scalp odor, 3-methylbutanal and pentanal are preferred. These aldehydes having 5 carbon atoms may be used alone or in combination.

[0020] The content of the aldehyde having 5 carbon atoms is not particularly limited, but may be, for example, 1.0×10 -4 ~5.0×10 -1 % by volume, and more preferably 5.0×10 -4 ~3.0×10 -1 % by volume, more preferably 1.0×10 -3 ~1.0×10 -2 The volume percent is 1.0 x 10 -4 % by volume or more, the sweat-like odor characteristic of the scalp of women in their 40s who feel that their body odor has changed with age tends to become stronger. -1 By adjusting the amount to vol.% or less, the smell of scalp odor tends to be improved.

[0021] Examples of fatty acids having 8 to 10 carbon atoms include octanoic acid, nonanoic acid, and decanoic acid, and from the viewpoint of the quality of the scalp odor, decanoic acid is preferred. These fatty acids having 8 to 10 carbon atoms may be used alone or in combination.

[0022] The content of the fatty acid having 8 to 10 carbon atoms is not particularly limited, but may be, for example, 1.0 × 10 -3 It is preferable that the content is 20% by volume or less, and more preferably 5.0×10 -3 ~10% by volume, more preferably 1.0 × 10 -2 The content of fatty acids with 8 to 10 carbon atoms is 1.0 × 10-3 By making the amount 20% by volume or less, the smell of scalp odor tends to be improved. On the other hand, by making the amount 20% by volume or less, the sweat-like smell characteristic of the scalp odor of women in their 40s who feel that their body odor has changed due to aging becomes stronger, and the smell of scalp odor tends to be improved.

[0023] In the artificial scalp odor composition of the present invention, the ratio (volume / volume) of the content of the fatty acid having 8 to 10 carbon atoms to the content of the aldehyde having 4 carbon atoms and the aldehyde having 5 carbon atoms is not particularly limited as long as it is 3 to 300, but for example, it is preferably 5 to 220, and more preferably 6 to 200. When the above ratio is 3 or more, the scalp odor tends to be improved. In addition, when it is 300 or less, the sweat-like odor specific to the scalp odor of women in their 40s who feel that their body odor has changed due to aging tends to become stronger. Note that the "content of the aldehyde having 4 carbon atoms and the aldehyde having 5 carbon atoms" refers to the total content of the aldehyde having 4 carbon atoms and the aldehyde having 5 carbon atoms contained in the artificial scalp odor composition of the present invention. The ratio (volume / volume) of the content of fatty acids having 8 to 10 carbon atoms to the content of aldehydes having 4 carbon atoms and aldehydes having 5 carbon atoms refers to the value obtained by dividing the "content (volume) of fatty acids having 8 to 10 carbon atoms" by the "content (volume) of aldehydes having 4 carbon atoms and aldehydes having 5 carbon atoms," where the volume is measured or calculated at 30°C.

[0024] The artificial scalp odor composition of the present invention may contain other components in addition to the aldehyde having 4 carbon atoms, the aldehyde having 5 carbon atoms, and the fatty acid having 8 to 10 carbon atoms, as long as the object of the present invention is not impaired. Examples of the other components include at least one selected from the group consisting of nonane, 2-butanone, and diacetyl. When the artificial scalp odor composition contains the above components, the quality of the scalp odor tends to be improved. The other components do not include the solvent described below.

[0025] The content of the other components is not particularly limited, but may be, for example, 1.0×10 -6 ~1.0×10 -2% by volume, and more preferably 1.0×10 -5 ~5.0×10 -3 Volume percent.

[0026] The content of nonane is not particularly limited, but may be, for example, 1.0×10 -5 ~1.0×10 -2 % by volume, and more preferably 1.0×10 -4 ~5.0×10 -3 By having the nonane content within the above range, the intensity of the scalp odor tends to be improved.

[0027] The content of 2-butanone is not particularly limited, but may be, for example, 1.0×10 -5 ~1.0×10 -2 % by volume, and more preferably 1.0×10 -4 ~5.0×10 -3 By having the 2-butanone content within the above range, the intensity of the scalp odor tends to be improved.

[0028] The content of diacetyl is not particularly limited, but may be, for example, 1.0×10 -6 ~5.0×10 -4 % by volume, and more preferably 5.0×10 -6 ~3.0×10 -4 By having the diacetyl content within the above range, there is a tendency for the scalp odor sensation to be improved.

[0029] Furthermore, the artificial scalp odor composition of the present invention can contain a solvent for the purpose of adjusting the concentration and quality of the scalp odor. The solvent is not particularly limited as long as it does not affect the scalp odor and can dissolve the aldehyde with 4 carbon atoms, the aldehyde with 5 carbon atoms, the fatty acid with 8 to 10 carbon atoms, and the other components, but examples thereof include mineral oil, propylene glycol, dipropylene glycol, 1,3-butylene glycol, diethyl phthalate, liquid paraffin, ethanol, water, etc.

[0030] [Method for evaluating scalp odor masking or deodorizing effects] Since the artificial scalp odor composition of the present invention is similar to the scalp odor of a woman in her 40s, it can be used to accurately evaluate the masking effect or deodorizing effect of scalp odor (especially the scalp odor of a woman in her 40s). For example, it is possible to efficiently screen a substance (test substance) that has an odor masking effect or deodorizing effect on scalp odor. Hereinafter, the method for evaluating the masking effect or deodorizing effect of scalp odor using the artificial scalp odor composition may be simply referred to as the "evaluation method of the present invention".

[0031] Examples of the test substance include odor components such as fragrances and flavors, substances expected to absorb or adsorb the simulated scalp odor composition, substances expected to change the structure of the simulated scalp odor composition, substances expected to decompose the simulated scalp odor composition, substances expected to suppress the volatilization of the simulated scalp odor composition, and the like, but are not limited to these examples.

[0032] The evaluation method of the present invention may include, for example, a step of contacting a test substance with the artificial scalp odor composition of the present invention (contact step), and then a step of measuring the resultant (measurement step). Examples of the contact step include a step of placing the artificial scalp odor composition of the present invention and the test substance in the same sealed container and leaving them for a specific time (for example, 1 to 120 minutes, preferably 5 to 60 minutes, more preferably 10 to 40 minutes) under a specific temperature (for example, 15 to 50 ° C., preferably 20 to 40 ° C.), and a step of adding the test substance to the artificial scalp odor composition of the present invention, mixing them, and leaving them for a specific time (for example, 1 to 120 minutes, preferably 5 to 60 minutes, more preferably 10 to 40 minutes) under a specific temperature (for example, 15 to 50 ° C., preferably 20 to 40 ° C.). The measurement process is a process for measuring the resultant product (e.g., a mixture of the test substance and the artificial scalp odor composition of the present invention) obtained after the contact process, and the measurement method can be, for example, a method using an analytical instrument or a method for determining the "odor" by a sensory test.

[0033] Examples of methods using analytical equipment include analytical methods using chromatography, such as gas chromatography-mass spectrometry, gas chromatography-flame ionization detection, gas chromatography-flame photometric detection, gas chromatography-electron capture detection, high performance liquid chromatography-ultraviolet-visible spectroscopy, and high performance liquid chromatography-mass spectrometry, as well as detection methods using semiconductor sensors and detection methods using gas detectors.

[0034] An example of a method for evaluation by a sensory test is a method of smelling the resultant product obtained through the contact step.

[0035] The method using analytical equipment is more effective than the method using sensory tests in that it allows absolute evaluation, has high accuracy, and can evaluate many test substances at once. On the other hand, the method using sensory tests is more effective than the method using analytical equipment in that it allows evaluation easily without complicated operations, and can evaluate even low concentrations of test substances.

[0036] The evaluation method of the present invention can be carried out, for example, by comparing the result obtained through the contact step and the measurement step with the result obtained through only the measurement step without going through the contact step. For example, a test substance is added to and mixed with the pseudo-scalp odor composition, and the odor of the mixture left standing at a specific temperature for a specific time is smelled, and compared with the odor of the pseudo-scalp odor composition itself (without adding the test substance) that has been subjected to the same operation, so as to evaluate the masking effect or deodorizing effect of the test substance on scalp odor.

[0037] [Indicator for Scalp Odor Judgment] The components constituting the pseudo-scalp odor composition of the present invention can also be used as an indicator for scalp odor judgment (hereinafter sometimes referred to as "the indicator of the present invention"). That is, the indicator of the present invention contains an aldehyde having 4 carbon atoms, an aldehyde having 5 carbon atoms, and a fatty acid having 8 to 10 carbon atoms, and is characterized in that the ratio (volume / volume) of the content of the fatty acid having 8 to 10 carbon atoms to the content of the aldehyde having 4 carbon atoms and the aldehyde having 5 carbon atoms is 3 to 300.

[0038] In addition to the aldehyde having 4 carbon atoms, the aldehyde having 5 carbon atoms, and the fatty acid having 8 to 10 carbon atoms, the indicator of the present invention may contain other components as long as the object of the present invention is not impaired. Examples of the other components include at least one selected from the group consisting of nonane, 2-butanone, and diacetyl. When the indicator contains these components, the quality of scalp odor can tend to be evaluated more accurately. It should be noted that the other components do not include the solvent described below.

[0039] Furthermore, a solvent can be blended in the indicator of the present invention for the purpose of adjusting the concentration and the quality of scalp odor. The solvent is not particularly limited as long as it has no influence on scalp odor and can dissolve an aldehyde having 4 carbon atoms, an aldehyde having 5 carbon atoms, a fatty acid having 8 to 10 carbon atoms, and the other components. Examples include mineral oil, propylene glycol, dipropylene glycol, 1,3-butylene glycol, diethyl phthalate, liquid paraffin, ethanol, water, and the like.

[0040] [Method for Determining Scalp Odor] Since the indicator agent of the present invention approximates scalp odor in women in their 40s, by using this as an index, the quality of scalp odor (especially scalp odor in women in their 40s) can be accurately determined. For example, by measuring the amount of the indicator agent contained in the measurement sample, it is possible to accurately, simply, and objectively determine the quality of scalp odor. Also, by comparing the indicator agent of the present invention prepared to have an arbitrary concentration with the components contained in the measurement sample, it is possible to accurately, simply, and objectively determine the quality of scalp odor.

[0041] As a method for collecting a measurement sample, there are methods such as covering the head with a resin bag such as a fluororesin or vinyl chloride resin for a certain period of time and then removing it and directly collecting the gas in the bag, adsorbing the above gas onto an adsorbent and collecting it, immersing a part of the hair in a solvent and performing solvent extraction, and the like.

[0042] As a method for measuring the amount of the indicator agent of the present invention contained in the measurement sample, there are methods using analytical instruments and methods for judging "odor" by sensory tests.

[0043] As methods using analytical instruments, for example, analytical methods using chromatographs such as gas chromatography-mass spectrometry, gas chromatography-flame ionization detection, gas chromatography-flame photometric detection, gas chromatography-electron capture detection, high-performance liquid chromatography-ultraviolet-visible spectroscopy, high-performance liquid chromatography-mass spectrometry, detection methods using semiconductor sensors, detection methods using gas detector tubes, and the like can be mentioned.

[0044] When the amount of the indicator agent is measured using an analytical instrument, examples of methods for determining the quality of scalp odor include a method for determining the quality of scalp odor by creating a calibration curve using the indicator agent as a standard substance and using this calibration curve to identify the amount of the indicator agent contained in the measurement sample, and a method for determining the quality of scalp odor in stages by comparing the analysis results of the indicator agent, which has been gradually prepared to reach an arbitrary concentration, with the analysis results of the measurement sample.

[0045] The method of judging by sensory test can be, for example, smelling the measurement sample.When the amount of the indicator of the present invention is measured by sensory test, the method of judging the quality of scalp odor can be, for example, preparing the indicator of the present invention that is gradually diluted as odor standard samples of each concentration.Then, the odor of the measurement sample can be compared with the standard sample to judge the quality of scalp odor.

[0046] [Scalp odor determination device] By using the indicator of the present invention, a device for accurately, simply, and objectively judging the quality of scalp odor (hereinafter, sometimes referred to as the "scalp odor judgment device of the present invention") can be provided. Examples of the scalp odor judgment device of the present invention include a scalp odor judgment device equipped with a means for measuring the amount of the indicator of the present invention contained in a measurement sample (hereinafter, sometimes referred to as the "measurement means") and a means for judging the quality of scalp odor (hereinafter, sometimes referred to as the "judging means"). The scalp odor judgment device of the present invention may be equipped with the measurement means and the judgment means as independent means, or may be equipped with a means capable of performing these simultaneously.

[0047] The measurement means is not particularly limited as long as it is a means for measuring the amount of the indicator agent of the present invention contained in the measurement sample, and may be, for example, a means using the above-mentioned analytical equipment (such as a chromatograph).

[0048] Methods for collecting measurement samples include a method in which a bag made of resin such as fluororesin or polyvinyl chloride resin is placed over the head for a certain period of time and then removed to directly collect the gas inside the bag, a method in which the gas is adsorbed onto an adsorbent or the like and collected, and a method in which part of the hair is immersed in a solvent and subjected to solvent extraction.

[0049] The judgment means is not particularly limited as long as it is a means for judging the quality of scalp odor, and may be, for example, a means for judging the quality of scalp odor by comparing the measurement result of the measurement sample obtained by the measurement means with the measurement result of the indicator agent of the present invention. Specifically, a judgment method in which a calibration curve is created using the indicator agent as a standard substance and the amount of the indicator agent contained in the measurement sample is identified using this calibration curve, or a method for judging the quality of scalp odor in stages by comparing the analysis result of the indicator agent prepared in stages to an arbitrary concentration with the analysis result of the measurement sample, etc. can be mentioned.

[0050] Examples of the scalp odor determining device of the present invention include a device equipped with a chromatograph, a device equipped with a semiconductor sensor, and a device equipped with a detector tube.

[0051] An example of an apparatus equipped with a chromatograph is a scalp odor determination device equipped with a chromatograph having, as a measurement means, a column, a sample injection section for supplying a measurement sample to the column, a detector for detecting components in the measurement sample after passing through the column, and a flow rate adjustment section for adjusting the flow rate of the mobile phase supplied to the column, and a data analysis section as a determination means, characterized in that the data analysis section has a function of determining the scalp odor of the measurement sample by comparing the time from when the measurement sample is supplied to the column to when the components are detected and the amount detected with the indicator agent of the present invention.

[0052] The indicator of the present invention as a comparison target in the data analysis unit of the chromatograph-equipped device is specifically the indicator supplied to the column and the detection time and detection amount of the component are measured. In other words, the data analysis unit preferably has a function of judging the scalp odor of the measurement sample by comparing the detection time and detection amount of the component in the measurement sample with the detection time and detection amount of the component contained in the indicator of the present invention. The measurement of the indicator may be performed before or after the measurement of the measurement sample, but it is preferable that it is performed before the measurement from the viewpoint of adjusting the supply amount of the measurement sample and the flow rate of the mobile phase.

[0053] The apparatus including the chromatograph may include an odor sensing mechanism connected to the outlet end of the column, which allows an operator to confirm the odor of the substance to be measured. The outlet end of the column of the chromatograph may be connected to the odor sensing mechanism and also to a mass spectrometer.

[0054] An example of an apparatus equipped with a semiconductor sensor is a scalp odor determination device that has a semiconductor sensor as a measurement means for detecting components in a measurement sample and a data analysis unit as a determination means, wherein the data analysis unit has the function of determining the scalp odor of the measurement sample by comparing the amount detected by the semiconductor sensor with the indicator agent of the present invention.

[0055] The indicator of the present invention as a comparison target in the data analysis unit of the device equipped with the semiconductor sensor is specifically the amount of the indicator detected by the semiconductor sensor.In other words, the data analysis unit preferably has a function of judging the scalp odor of the measurement sample by comparing the detection amount of the component in the measurement sample with the detection amount of the component contained in the indicator of the present invention.From the viewpoint of being able to easily and immediately judge, it is preferable that the measurement of the indicator is performed before the measurement of the measurement sample and stored in the data analysis unit.

[0056] An example of a device equipped with a detector tube is a device that is equipped with a means capable of simultaneously performing a measurement means and a determination means. Specifically, an example of such a scalp odor determination device is a scalp odor determination device in which a detector tube filled with a detector agent inside a cylindrical tube that can be opened at both ends is connected to a gas sampler, and by operating the gas sampler, a measurement sample is sucked in from the end of the detector tube that is not connected to the gas sampler, and the detector agent changes color when it comes into contact with the detector agent filled inside the detector tube, thereby determining the scalp odor of the measurement sample.

[0057] The detector of the device having a detector tube as the detector is a detector that changes color by reacting with the components constituting the indicator of the present invention. Furthermore, it is preferable that the detector has a function of determining the scalp odor of the measurement sample by using a detector whose color change amount is adjusted using the indicator of the present invention as the detector.

[0058] The number of indicators used in each scalp odor judgment device is not particularly limited. When one type of indicator is used, there is one indicator for scalp odor judgment, and a clearer judgment result can be shown. When two or more types of indicators are used, there are two or more indicators for scalp odor judgment, and stepwise judgment and more accurate judgment are possible. EXAMPLES

[0059] The present invention will be described in more detail below based on Test Examples and Examples, but the present invention is not limited to these.

[0060] <Test Example> Body odor analysis Thirty-five subjects were divided into two groups: those who were bothered by body odor and those who were not particularly bothered by it. In a room at 25°C, three evaluators smelled various parts of the body of each group to identify the source of the body odor. A significant difference was found in the scalp odor of the subjects who were bothered by body odor.

[0061] Analysis of scalp odor-causing components The subjects' scalp odor was evaluated for quality and analyzed for components. The odor quality was evaluated by a sensory evaluation in a room at 25°C by three evaluators who smelled the scalp of 35 subjects. The evaluation was based on the following criteria, and the average score was calculated. (Odor Intensity) 5.0 points: Quite strong smell 4.0 points: Slightly strong odor 3.0 points: Clear odor 2.0 points: Weak odor 1.0: Slightly smelling 0 points: No smell

[0062] The component analysis was performed using 20 subjects' heads covered with fluororesin bags for 5 minutes as measurement samples, using a gas chromatograph mass spectrometer (Agilent Technology, product names: 7890B gas chromatograph and 5977A mass selective detector) connected to an automatic concentrator (Entech Instruments Inc., product name: 7100A-Preconcentrator) and an odor sniffing port (Gestell, product name: ODP2 sniffing port). In other words, the odor components emitted from each measurement sample were concentrated using the automatic concentrator, and the concentrated samples obtained were fed to the gas chromatograph mass spectrometer connected to the odor sniffing port, allowing the components to be detected while confirming the odor of each separated component.

[0063] ·Analysis conditions Column used: Agilent Technology, product name: DB-1701 (60m x 0.25mm x 1.0μm) Gas used: Helium Temperature conditions: 50°C to 80°C (heating rate 5°C / min), 80°C to 160°C (heating rate 3°C / min) (maintained for 5 minutes), 160°C to 260°C (heating rate 10°C / min) (maintained for 15 minutes) Ionization method: Electron ionization method (EI), 60 eV

[0064] As a result of the odor intensity evaluation and component analysis, aldehydes with low carbon numbers and fatty acids with carbon numbers of 8 to 10 were identified as components highly correlated with odor quality.

[0065] <Examples and Comparative Examples> Preparation of test compositions According to the formulations shown in Table 1, test compositions of Examples 1 to 15 and Comparative Examples 1 to 6 were obtained. Note that the units of the numerical values ​​of the components in the table are ppm (v / v) (=10 -4 The "Fatty acid / aldehyde" column in the table indicates the ratio (volume / volume) of the content of fatty acids having 8 to 10 carbon atoms to the content (total amount) of aldehydes having 4 carbon atoms and aldehydes having 5 carbon atoms.

[0066] [Evaluation of the test composition] 200 μL of the test composition was added to a cotton ball and placed in an odorless vial. Three evaluators then smelled the test composition in a room at 25°C to evaluate its quality as a scalp odor. The evaluation was conducted through discussion based on the following criteria, and is shown in Table 1. Note that the higher the quality of the scalp odor, from D to S, and the higher the strength, from C to A, the more excellent the composition tends to be as a pseudo-scalp odor composition (scalp odor indicator).

[0067] (Evaluation of odor quality) S: It is clearly a scalp odor that includes a sweaty odor. A: It smells like a scalp odor and also contains a sweaty odor. B: It smells like a scalp odor, and somehow feels like a scalp odor that also contains a sweaty odor. C: It seems to be a scalp odor, but it is not a scalp odor that includes a sweaty odor. D: It's not scalp odor.

[0068] (Odor Intensity Rating) A: An odor that can be easily detected B: The type of odor can be identified C: An odor that can only be detected by careful smelling.

[0069]

Table 1

Claims

1. A scalp odor simulation composition comprising an aldehyde having 4 carbon atoms, an aldehyde having 5 carbon atoms, and a fatty acid having 8 to 10 carbon atoms, The artificial scalp odor composition has a ratio (volume / volume) of the content of fatty acids having 8 to 10 carbon atoms to the content of aldehydes having 4 carbon atoms and aldehydes having 5 carbon atoms of 3 to 300.

2. The artificial scalp odor composition according to claim 1, further comprising at least one selected from the group consisting of nonane, 2-butanone, and diacetyl.

3. A method for evaluating the scalp odor masking effect or deodorizing effect using the artificial scalp odor composition according to claim 1 or 2.

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