CN112067560B - Tobacco material liquid stability determination method based on chromaticity value and entropy weight method - Google Patents
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Abstract
The application relates to a tobacco material liquid stability measuring method based on a chromaticity value combined with an entropy weighting method, which comprises sampling, chromaticity value measurement, objective weighting of the entropy weighting method, coefficient of variation calculation of chromaticity indexes, determination of weight coefficients of different chromaticity values by the entropy weighting method, comprehensive coefficient of variation of chromaticity values and calculation of material liquid stability. In the process of changing the stability of the tobacco material liquid, the conditions of layering, fermenting and deteriorating the material liquid are often accompanied, so that the color of the material liquid changes to a certain extent, and the tobacco material liquid with changed stability or slight change can be accurately and sensitively measured by utilizing a chromaticity value combined with an entropy weight method.
Description
Technical Field
The application belongs to the technical field of detection of tobacco material liquid, and particularly relates to a method for measuring the stability of tobacco material liquid based on a chromaticity value combined with an entropy weight method.
Background
The tobacco material liquid has important significance for improving and stabilizing the quality of cigarettes and endowing the cigarettes with unique smoking style and establishing the cigarette style. With the development of the cigarette industry, the cross-region or cross-province different-region regional production of cigarettes has become a trend, and remote cooperation among factories is urgent. The cigarette material liquid is used as a complex mixture with multiple components, is limited by factors such as secret formula management, and the like, and the cigarette material liquid of the same cigarette brand needs to be uniformly and intensively prepared and supplied by factories in order to ensure the stability of the cigarette material liquid in cigarette production. Therefore, in order to avoid fermentation and deterioration of the tobacco feed liquid during transportation and influence the quality assurance of the tobacco feed liquid, the monitoring and measuring method for the quality and stability of the tobacco feed liquid during long-distance transportation is particularly important.
At present, the indexes for detecting the stability of the tobacco material liquid in the tobacco industry are not more, commonly available indexes are an acidity value, pH value, refractive density and the like, but the indexes are small in change range or not change at the moment under the conditions of fermentation, deterioration and the like of the tobacco material liquid after long-distance transportation, so that the indexes cannot be well used for measuring and representing the stability of the tobacco material liquid. Therefore, a novel detection method is searched for monitoring and characterizing the stability of the tobacco material liquid, and has important significance for the high-quality development of the tobacco industry.
Detection methods such as acidity value, pH, refractive density or particle size of particles in feed liquid, centrifugal precipitation rate and the like have long been questioned for stability detection and characterization of feed liquid. For example, for feed liquids that have precipitated at the bottom of the tank during long-distance transport, theoretically, the stability of such feed liquids has been reduced, but the indexes such as acidity value, pH, refractive density, etc. have not been significantly changed; for example, in the case of a tobacco material liquid which has been fermented and deteriorated during long-distance transportation, the particle diameter, the centrifugal sedimentation rate, and the like of the material liquid have not been significantly changed, and therefore, these indices cannot be used for scientifically and accurately detecting the stability of the tobacco material liquid as a whole.
In the current tobacco industry, no set of system, accurate and sensitive detection method is used for representing the stability of the tobacco material liquid, the stability of the material liquid is detected and represented by indexes of acidity value, pH value, refractive density or particle size and centrifugal precipitation rate in the material liquid, and the accuracy and the sensitivity of the indexes always restrict the steps of homogenizing and developing the tobacco material liquid.
Disclosure of Invention
The application aims to provide a method for measuring the stability of tobacco material liquid based on a chromaticity value combined with an entropy weight method, so as to solve the problem that the stability of the tobacco material liquid cannot be monitored and represented systematically, accurately and sensitively in the prior art.
The application is realized by the following technical scheme:
a tobacco material liquid stability measuring method based on a chromaticity value and entropy weight method comprises the following steps:
s1, sampling
Sampling once every set time at the secondary batching outlet of the tobacco material liquid in any batch production time, and sampling for i times, wherein i is a natural number greater than or equal to 1;
s2, measurement of colorimetric values
At room temperature, a set amount of each sample of the tobacco material liquid is taken and placed in a detection device, and the CIE-Lab color space value of each sample is measured by using a color difference meter: l is from black to white, representing brightness values, a is from green to red, representing redness values, b is from blue to yellow, representing yellowness values;
s3, objectively giving weight by entropy weight method
At room temperature, taking 3 chromaticity indexes L, a and b as 3 evaluation indexes, and objectively weighting variation coefficients of the 3 chromaticity indexes by adopting an information entropy principle; respectively weighting the variation coefficients of each chromaticity value of each sample of the tobacco feed liquid subjected to the stability test to obtain comprehensive variation coefficients of 3 chromaticity indexes;
s4, calculating variation coefficient of chromaticity index
Respectively testing the chromaticity values of the i samples A1-Ai after pretreatment according to a chromaticity value measuring method to obtain a numerical matrix Xij of 3 chromaticity values of the i samples, and calculating an average value MN of each chromaticity index j(A1-Ai) Standard deviation SD j(A1-Ai) Coefficient of variation thereof
S5, determining weight coefficients of different chromaticity values by an entropy weight method
According to the requirement of entropy weight calculation on data, carrying out normalization processing on each column of index data in a sample chromaticity value matrix Xij by using a formula (1), and carrying out attribute value X 'of each column of the normalized index matrix' 1j ，X′ 2j ，…，X′ ij Regarding the distribution of the information amount, the information entropy Ej of the chromaticity index j is calculated using the formula (2), and the entropy weight coefficient wj of the chromaticity value j can be obtained by the formula (3):
wherein: wj is more than or equal to 0 and less than or equal to 1,calculating to obtain weight coefficients w 1-w 3 of 3 chromaticity indexes L, a and b through formulas (1), (2) and (3);
s6, calculating comprehensive variation coefficient of chromaticity value and stability of feed liquid
Based on the calculated results of the variation coefficients of the 3 chromaticity indexes L, a and b and the entropy weight coefficients thereof, the tobacco material is obtained by using a formula (4)Comprehensive coefficient of variation CV of 3 chromaticity indexes of liquid i samples A Calculating the tobacco shred blending uniformity H value by using a formula (5);
H＝(1-CV A )×100％ (5)。
preferably, the samples are placed in a constant temperature and humidity box with the relative humidity of 65+/-2% at 20+/-1 ℃ respectively for balancing for 48 hours for later use.
Preferably, the detection device is a quartz rectangular chamber.
Preferably, 3 different positions are selected for measurement of the sample in each quartz rectangular cell, and the average value is automatically calculated 1 time for each 3 consecutive measurements by the colorimeter.
Preferably, the method further comprises accuracy and precision tests, wherein tobacco material liquid samples with different brands are respectively selected, the samples are respectively sampled for a plurality of times to carry out colorimetric value parallel measurement, and whether the standard deviation and the variation coefficient are in a set range is calculated.
The beneficial effects of the application are as follows:
in the process of changing the stability of the tobacco material liquid, the conditions of layering, fermenting and deteriorating the material liquid are often accompanied, so that the color of the material liquid changes to a certain extent, and the tobacco material liquid with changed stability or slight change can be accurately and sensitively measured by utilizing a chromaticity value combined with an entropy weight method.
Detailed Description
The following examples are given by way of illustration only and are not to be construed as limiting the scope of the application.
Along with the development of colorimetry theory and practice, the change of chemical components and physical indexes in a certain substance is evaluated by using a colorimetry value, a certain degree of evaluation standard and method are formed, and different substances have larger differences in physicochemical properties and colors, so that a foundation is laid for evaluating the stability of each component in the tobacco feed liquid by using a color difference method. In the process of changing the stability of the tobacco material liquid, the conditions of layering, fermenting and deteriorating the material liquid are often accompanied, so that the color of the material liquid changes to a certain extent, and the tobacco material liquid with changed stability or slight change can be accurately and sensitively measured by utilizing a chromaticity value combined with an entropy weight method.
The application provides a method for measuring the stability of tobacco material liquid based on a chromaticity value combined with an entropy weight method, which comprises the following steps:
sampling:
the four grades of tobacco material liquid A-D are selected randomly, 5 times of sampling are carried out at the outlet of the secondary batching (fully formulated finished product) of the tobacco material liquid in any batch production time of each grade, the interval between each sampling is 20 minutes, in other embodiments of the application, the interval time can be determined according to the needs, and can be less than 20 minutes, or can be more than 20 minutes, such as 15 minutes, 30 minutes, 1 hour, and the like, about 500g of each grade can be sampled, and samples of the tobacco material liquid with different grades and different time points are marked as Ai, bi, ci, di, wherein i is the natural number of 1,2,3, … and 10. Namely, tobacco material liquid samples are divided into four groups according to the brands.
Four groups of tobacco material liquid samples are respectively placed in a constant temperature and humidity box with the temperature of 20+/-1 ℃ and the relative humidity of 65+/-2% for balancing for 48 hours for standby.
Colorimetric value measurement
Selecting any group of tobacco material liquid samples, namely 5 tobacco material liquid samples, namely A1, A2, A3, A4 and A5 by taking brand A as an example, placing 50g of each tobacco material liquid sample into 250mm by 250 x 250 quartz rectangular cells at room temperature, sucking residual bubbles on the surfaces of the tobacco material liquid samples by using a dropper, and measuring CIE-L, a, b color space values of the feed liquid by using a color difference meter: l is from black to white, indicating brightness values, a is from green to red, indicating redness values, b is from blue to yellow, indicating yellowness values. Taking j times altogether, and using Cj (j takes the natural number of 1,2 and 3) to represent a certain chromaticity index. The feed liquid sample in each quartz rectangular chamber is measured at 3 different positions, and the average value of 1 time is automatically calculated every 3 times of continuous measurement by a color difference meter.
The entropy weight method objectively gives weight:
at room temperature, 3 chromaticity indexes L, a and b are regarded as 3 evaluation indexes, the information entropy principle is adopted to objectively weight the variation coefficients of the 3 chromaticity indexes, the variation coefficients of each chromaticity value of 5 tobacco material liquid samples are respectively weighted, the comprehensive variation coefficients of the 3 chromaticity indexes are further obtained, and the blending uniformity of the formula tobacco shreds is calculated by utilizing the comprehensive variation coefficients.
Calculating a variation coefficient of the chromaticity index:
after pretreatment, 5 tobacco material liquid samples of the brand A are respectively subjected to metric value test according to a colorimetric value measurement method to obtain a numerical matrix Xij of 3 colorimetric values of the 5 tobacco material liquid samples of the brand A, and the average value of each colorimetric index is calculatedStandard deviation->And its coefficient of variation->The results are shown in Table 1. As can be seen from Table 1, the variation coefficients of the 3 indexes have large differences between 1.14% and 5.67%, which indicates that the information amounts provided by the different color indexes in the evaluation process are different.
TABLE 1 determination of the color values of 5 different time points for Brand A tobacco feed
| Numbering of tobacco liquid | L* | a* | b* |
| A1 | 59.17 | 9.91 | 29.72 |
| A2 | 59.84 | 9.73 | 29.73 |
| A3 | 59.24 | 10.67 | 31.14 |
| A4 | 60.85 | 9.13 | 28.12 |
| A5 | 59.99 | 10.12 | 29.53 |
| Average value of | 59.82 | 9.91 | 29.65 |
| Standard deviation of | 0.68 | 0.56 | 1.07 |
| Coefficient of variation/% | 1.14 | 5.67 | 3.61 |
The entropy weight method determines weight coefficients of different chromaticity values:
taking the chromaticity value matrix Xij of the tobacco material liquid in table 1 as an example, according to the requirement of entropy weight calculation on data, firstly, carrying out normalization processing on each column of index data of the chromaticity value matrix Xij of the tobacco material liquid by using a formula (1):
attribute values (X 'of each column of the normalized index matrix' 1j ，X′ 2j ，…，X′ 5j ) Regarding the distribution of the information amount, the information entropy Ej of the chromaticity index j is calculated by using the formula (2), and the entropy weight coefficient wj of the chromaticity value j is obtained by the formula (3):
wherein: wj is more than or equal to 0 and less than or equal to 1,
based on the chromaticity data of the tobacco material liquid in table 1, the weight coefficients w1 to w3 of the 3 chromaticity indexes (L, a, b) are calculated by the formulas (1), (2), and (3): 0.0277, 0.6917, 0.2806.
And (3) calculating the comprehensive coefficient of variation of the chromaticity value and the stability of the tobacco material liquid:
based on the calculated results of the variation coefficients of the 3 chromaticity indexes and the entropy weight coefficients thereof, the method is obtained by using a formula (4)Comprehensive coefficient of variation CV to 3 chromaticity indexes of 5 tobacco material liquid samples of brand A tobacco material liquid A The method comprises the steps of carrying out a first treatment on the surface of the And finally, calculating the tobacco shred blending uniformity H value by using a formula (5).
H＝(1-CV A )×100％ (5)
The stability H values of the feed liquid for the brand A cigarettes in table 1 at 5 different time points are 95.03% obtained through calculation of formulas (4) and (5).
Accuracy and precision testing:
samples A1, B1, C1 and D1 of 4 brands of tobacco liquid were respectively selected, each sample was sampled 6 times to conduct colorimetric parallel measurement tests, and standard deviation and variation coefficient thereof were calculated, and the results are shown in Table 2. The coefficient of variation of the results of 6 times of measurement of 3 chromaticity values of the same tobacco liquid sample is between 0.13 and 0.63 percent, which shows that the accuracy of the measurement result of the chromaticity value of the tobacco powder by using a color difference meter is higher. In addition, as can be seen from table 2, the difference in chromaticity values of different tobacco feed liquids is more obvious.
TABLE 2 accuracy test of measurement results of color value of tobacco liquid
The stability of the tobacco material liquid was measured by measuring the accuracy of the stability of the tobacco material liquid by combining the chromaticity value with the entropy weight method, and 6 groups of tobacco material liquid were respectively measured for each of brands A to D, and the results are shown in Table 3. It can be seen that the variation coefficient of the stability of the liquid used for the cigarettes of brands A-D is between 0.30 and 0.57 percent, which proves that the method has higher precision and meets the requirement of quantitative analysis.
TABLE 3 results of precision test of tobacco liquid stability
Repeatability test:
the method is used for measuring the tobacco feed liquid of the brand A for 6 continuous days, the H values are 94.59%,94.62%,94.41%,94.86%,94.67% and 94.10%, the standard deviation is 0.26%, the variation coefficient is 0.28%, and the method is good in repeatability and meets the requirement of quantitative analysis.
Comparing and testing the feed liquid and fermentation feed liquid for normal cigarettes of the same brand:
the color value and entropy weight method were used to determine the feed liquid stability of the same brand of normal tobacco feed liquid and fermented tobacco feed liquid, and the E, F feed liquid (E is normal feed liquid and F is fermented feed liquid) was tested for 6 times of feed liquid stability, and the results are shown in Table 4. It can be seen that the stability and uniformity of the internal components of the same brand of tobacco material liquid are changed due to chemical changes generated by fermentation, the standard deviation of the stability of each group of tobacco material liquid is 0.4 and 0.51 respectively, and the variation coefficients are 0.004 and 0.012 respectively, which indicate that the calculation results of each group of data are relatively stable.
TABLE 4 comparative test results of fermented tobacco feed liquid
Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.
Claims (5)
1. The method for measuring the stability of the tobacco liquid based on the combination of the chromaticity value and the entropy weight method is characterized by comprising the following steps of:
s1, sampling
Sampling once every set time at the secondary batching outlet of the tobacco material liquid in any batch production time, and sampling for i times, wherein i is a natural number greater than or equal to 1;
s2, measurement of colorimetric values
At room temperature, a set amount of each sample of the tobacco material liquid is taken and placed in a detection device, and the CIE-Lab color space value of each sample is measured by using a color difference meter: l is from black to white, representing brightness values, a is from green to red, representing redness values, b is from blue to yellow, representing yellowness values;
s3, objectively giving weight by entropy weight method
At room temperature, taking 3 chromaticity indexes L, a and b as 3 evaluation indexes, and objectively weighting variation coefficients of the 3 chromaticity indexes by adopting an information entropy principle; respectively weighting the variation coefficients of each chromaticity value of each sample of the tobacco feed liquid subjected to the stability test to obtain comprehensive variation coefficients of 3 chromaticity indexes;
s4, calculating variation coefficient of chromaticity index
Respectively testing the chromaticity values of the i samples A1-Ai after pretreatment according to a chromaticity value measuring method to obtain a numerical matrix Xij of 3 chromaticity values of the i samples, and calculating an average value MN of each chromaticity index j(A1-Ai) Standard deviation SD j(A1-Ai) Coefficient of variation thereof
S5, determining weight coefficients of different chromaticity values by an entropy weight method
According to the requirement of entropy weight calculation on data, carrying out normalization processing on each column of index data in a sample chromaticity value matrix Xij by using a formula (1), and carrying out attribute value X 'of each column of the normalized index matrix' 1j ，X′ 2j ，…，X′ ij Considering the distribution of information amount, calculating the information entropy Ej of the chromaticity index j by using the formula (2), and then calculating the entropy weight coefficient of the chromaticity value jwj can be obtained by equation (3):
wherein: wj is more than or equal to 0 and less than or equal to 1,calculating to obtain weight coefficients w 1-w 3 of 3 chromaticity indexes L, a and b through formulas (1), (2) and (3);
s6, calculating comprehensive variation coefficient of chromaticity value and stability of feed liquid
Based on the calculated results of the variation coefficients of the 3 chromaticity indexes L, a and b and the entropy weight coefficients thereof, the comprehensive variation coefficient CV of the 3 chromaticity indexes of the i samples of the tobacco material liquid is obtained by utilizing the formula (4) A Calculating the tobacco shred blending uniformity H value by using a formula (5);
H＝(1-CV A )×100％ (5)。
2. the method for determining the stability of tobacco liquid based on a colorimetric value combined entropy weight method according to claim 1, wherein the samples are respectively placed in a constant temperature and humidity box with a relative humidity of 65+/-2% at 20+/-1 ℃ for balancing for 48 hours for later use.
3. The method for determining the stability of tobacco liquid based on a combination of colorimetric values and an entropy weighting method according to claim 1, wherein the detection device is a quartz rectangular cell.
4. A method for determining the stability of a tobacco liquid based on a colorimetric value combined with an entropy weighting method according to claim 3, characterized in that the sample in each quartz rectangular cell is selected for determination at 3 different positions, and the average value is automatically calculated 1 time for each 3 consecutive determinations by a color difference meter.
5. The method for determining the stability of the tobacco liquid based on the combination of the chromaticity value and the entropy weight according to claim 1, further comprising the steps of testing the accuracy and the precision, respectively selecting tobacco liquid samples with different brands, respectively sampling for a plurality of times to perform chromaticity value parallel determination, and calculating whether the standard deviation and the variation coefficient are within the set range.
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| CN113281487A (en) * | 2021-07-01 | 2021-08-20 | 广东韶钢松山股份有限公司 | Method and device for evaluating quality stability of bituminous coal |
| CN113945563A (en) * | 2021-10-19 | 2022-01-18 | 中国烟草总公司湖北省公司 | Method for evaluating quality uniformity of cigar wrapper tobacco leaves |
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