CN109900755A - A kind of detection method of fresh tobacco leaves oil - Google Patents
A kind of detection method of fresh tobacco leaves oil Download PDFInfo
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- CN109900755A CN109900755A CN201910340817.6A CN201910340817A CN109900755A CN 109900755 A CN109900755 A CN 109900755A CN 201910340817 A CN201910340817 A CN 201910340817A CN 109900755 A CN109900755 A CN 109900755A
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Abstract
The present invention relates to a kind of detection methods of fresh tobacco leaves oil, belong to technical field of analysis and detection.The detection method measures capacitor between fresh tobacco leaves upper surface capacitor, lower surface capacitor and upper and lower surface first and calculates, and obtains upper surface capacitance per unit lengthC On , lower surface capacitance per unit lengthC Under And capacitance per unit length between blade upper and lower surfaceC Between ；Later by obtainingC On 、C Under 、C Between It is calculated, obtains the mass percentage of fresh tobacco leaves oil.Detection method is non-destructive testing, and entire detection process does not damage tobacco plant and tobacco leaf, and detection time is only a few minutes, as a result accurately, application easy to spread.
Description
Technical field
The invention belongs to technical field of analysis and detection, and in particular to a kind of detection method of fresh tobacco leaves oil.
Background technique
The main chemical of fresh tobacco leaves is to determine one of the interior quality principal element of cigarette product.Wherein, especially
It is that oil in fresh tobacco leaves has important influence for the fragrance of cigarette product, the oil content of usual fresh tobacco leaves is big,
Then the fragrance of its cigarette products is abundant, conversely, then the fragrance of its cigarette products is insufficient.Oil is that tobacco tissue contains into the cell
A kind of softness semiliquid or liquid substance, according to tobacco leaf appearance oil state and sensory feel, oil is in tobacco leaf growth course
In the osmiophilic granules that chloroplaset inner membrance is formed, it is considered that it is related with ligroin extraction, it mainly include volatile oil, grease, tree
Rouge, fatty acid, wax, lipides, sterol and pigment etc..Therefore, the detection method for establishing fresh tobacco leaves oil, for fresh
Quality of tobacco quality has index effect.
Currently, fresh tobacco leaves are adopted for the method that the detection of fresh tobacco leaves oil mainly uses petroleum ether extraction
After collection, with petroleum ether soak extraction, extract quality is weighed the number of oil characterized.The disadvantages of this method mainly operates multiple
It is miscellaneous, it cannot directly detect and detection process has damage fresh tobacco leaves and tobacco plant.Therefore how to overcome the prior art
The problem of deficiency is present analysis detection technique field urgent need to resolve.
Summary of the invention
It is an object of the present invention to solve the deficiency of the existing technology and provide a kind of detection method of fresh tobacco leaves oil,
The detection method is non-destructive testing, and detection time is only a few minutes, as a result accurately, application easy to spread.
To achieve the above object, The technical solution adopted by the invention is as follows:
A kind of detection method of fresh tobacco leaves oil, includes the following steps:
Step a, measurement fresh tobacco leaves upper surface capacitor capacitor and calculate between lower surface capacitor and upper and lower surface, obtain
Surface unit length capacitor COn, lower surface capacitance per unit length CUnderAnd capacitance per unit length C between blade upper and lower surfaceBetween；
Wherein, capacitance per unit length value measures the ratio of capacitor and its distance between two test points, unit be pico farad/li
Rice；
Capacitance per unit length numerical value obtained in step a is calculated in formula (I), fresh cigarette can be obtained by step b
The mass percentage of leaf oil point；
OOil contains rate=0.34 × COn+0.98×CUnder+0.23×CBetween, formula (I), wherein OOil contains rate% is fresh tobacco leaves oil
Mass percentage.
It is further preferred that test point avoids leaf vein, and the line between two test points does not span across leaf vein.
It is further preferred that capacitor is both needed to measure between fresh tobacco leaves upper surface capacitor, lower surface capacitor and upper and lower surface
Repeatedly, the upper surface capacitance per unit length C being calculatedOn, lower surface capacitance per unit length CUnderAnd it is single between blade upper and lower surface
Bit length capacitor CBetweenRespectively take the mean value of its multiple survey calculation result.
It is further preferred that between measurement fresh tobacco leaves upper surface capacitor, lower surface capacitor and upper and lower surface when capacitor,
It is both needed to measure in tobacco leaf blade tip, leaf with phyllopodium three parts.
It is further preferred that the measurement specifically chooses tobacco leaf blade tip, in leaf and in the detection of phyllopodium three parts respectively
Capacitance per unit length between surface, lower surface and upper and lower surface, every part detection number are no less than 3 times, and to all measurement numbers
According to being averaged.
Compared with prior art, the present invention has the advantages that:
(1) operation of the present invention is simple, required time is short, it is only necessary to which a few minutes can be obtained by the oil content of fresh tobacco leaves
Numerical value can be used for the judgement of fresh tobacco leaves quality and maturity.
(2) present invention is non-destructive testing, and entire detection process does not damage tobacco plant and tobacco leaf, can be direct
Carry out In vivo detection.
(3) testing result of the present invention is accurate, no longer needs to by subsequent complicated analysis, the oil that fresh tobacco leaves can be obtained contains
Measure exact value.
(4) without complicated pre-treatment, time of measuring foreshortens to 5min by several hours of conventional dry gravimetric method, detects
Efficiency greatly improves.Measurement result matches with conventional method, and error is less than 10%.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail.
It will be understood to those of skill in the art that the following example is merely to illustrate the present invention, and it should not be regarded as limiting this hair
Bright range.In the examples where no specific technique or condition is specified, described technology or conditions according to the literature in the art
Or it is carried out according to product description.Production firm person is not specified in material therefor or equipment, is that can be obtained by purchase
Conventional products.
Embodiment 1
A kind of detection method of fresh tobacco leaves oil, includes the following steps:
Step a, measurement fresh tobacco leaves upper surface capacitor capacitor and calculate between lower surface capacitor and upper and lower surface, obtain
Surface unit length capacitor COn, lower surface capacitance per unit length CUnderAnd capacitance per unit length C between blade upper and lower surfaceBetween；
Wherein, capacitance per unit length value measures the ratio of capacitor and its distance between two test points, unit be pico farad/li
Rice；
Capacitance per unit length numerical value obtained in step a is calculated in formula (I), fresh cigarette can be obtained by step b
The mass percentage of leaf oil point；
OOil contains rate=0.34 × COn+0.98×CUnder+0.23×CBetween, formula (I), wherein OOil contains rate% is fresh tobacco leaves oil
Mass percentage.
Embodiment 2
A kind of detection method of fresh tobacco leaves oil, includes the following steps:
Step a, measurement fresh tobacco leaves upper surface capacitor capacitor and calculate between lower surface capacitor and upper and lower surface, obtain
Surface unit length capacitor COn, lower surface capacitance per unit length CUnderAnd capacitance per unit length C between blade upper and lower surfaceBetween；
Wherein, capacitance per unit length value measures the ratio of capacitor and its distance between two test points, unit be pico farad/li
Rice；
Capacitance per unit length numerical value obtained in step a is calculated in formula (I), fresh cigarette can be obtained by step b
The mass percentage of leaf oil point；
OOil contains rate=0.34 × COn+0.98×CUnder+0.23×CBetween, formula (I), wherein OOil contains rate% is fresh tobacco leaves oil
Mass percentage.
Wherein, test point avoids leaf vein, and the line between two test points does not span across leaf vein.
Capacitor is both needed to measurement repeatedly between fresh tobacco leaves upper surface capacitor, lower surface capacitor and upper and lower surface, is calculated
Upper surface capacitance per unit length COn, lower surface capacitance per unit length CUnderAnd capacitance per unit length C between blade upper and lower surfaceBetweenRespectively take
The mean value of its multiple survey calculation result.
Embodiment 3
A kind of detection method of fresh tobacco leaves oil, includes the following steps:
Step a, measurement fresh tobacco leaves upper surface capacitor capacitor and calculate between lower surface capacitor and upper and lower surface, obtain
Surface unit length capacitor COn, lower surface capacitance per unit length CUnderAnd capacitance per unit length C between blade upper and lower surfaceBetween；
Wherein, capacitance per unit length value measures the ratio of capacitor and its distance between two test points, unit be pico farad/li
Rice；
Capacitance per unit length numerical value obtained in step a is calculated in formula (I), fresh cigarette can be obtained by step b
The mass percentage of leaf oil point；
OOil contains rate=0.34 × COn+0.98×CUnder+0.23×CBetween, formula (I), wherein OOil contains rate% is fresh tobacco leaves oil
Mass percentage.
Wherein, test point avoids leaf vein, and the line between two test points does not span across leaf vein.
Capacitor is both needed to measurement repeatedly between fresh tobacco leaves upper surface capacitor, lower surface capacitor and upper and lower surface, is calculated
Upper surface capacitance per unit length COn, lower surface capacitance per unit length CUnderAnd capacitance per unit length C between blade upper and lower surfaceBetweenRespectively take
The mean value of its multiple survey calculation result.
State measurement specifically choose tobacco leaf blade tip respectively, in leaf and phyllopodium three parts detection upper surface, lower surface and up and down
Capacitance per unit length between surface, every part detection number is no less than 3 times, and is averaged to all measurement data.
The construction method of model of the present invention is as follows:
1. data acquire
Different cultivars, planting conditions and the living body tobacco plant in growth period are chosen, it is miscellaneous to remove silt, the moisture on surface etc.
Matter.Using digital electric bridge high-accuracy capacitor table, frequency 500Hz is measured, tobacco leaf position is measured, is read after stablizing 10s
Number, each position pendulous frequency are no less than 3 times, take its average value.Ambient humidity is not more than 40% when detection, temperature range 18-
30℃。
2. standard method measures
For above-mentioned tobacco leaf, according to the professional standard " survey of YC/T 176-2003 tobacco and tobacco product ligroin extraction
(YC/T 468-2013) is detected to obtain the total oil content of its tobacco leaf calmly ".
3. model foundation
To in 1,2 the data obtaineds abnormal data and outlier identified and rejected, 227 sample numbers of final choice
According to importing SPSS software is established electrical characteristics and quickly detected linear regression model (LRM) using least square method multiple linear regression:
OOil contains rate=0.34 × COn+0.98×CUnder+0.23×CBetween, coefficient of determination r2=0.947.
Application example
Further illustrate the desired effect that the present invention is reached, inventor has randomly selected different on 20 plants of tobacco plants
Position tobacco leaf, kind and concrete position are shown in Table 1, detect its fresh tobacco leaves upper surface capacitance per unit length (COn), following table
Face capacitance per unit length (CUnder) and blade upper and lower surface between capacitance per unit length (CBetween), capacitance per unit length unit uses skin
Method/centimetre, using regression equation OOil contains rate=0.34 × COn+0.98×CUnder+0.23×CBetween, coefficient of determination r2=0.947, meter
The value of its fresh tobacco leaves oil content is calculated, while YC/T 176-2003 method detection fresh tobacco leaves ligroin extraction being taken to contain
The measured value as fresh tobacco leaves oil is measured, the results are shown in Table 2.
Table 1
2 20 parts of fresh tobacco leaves sample oil predicted values of table are compared with measured value
| Number | Oil predicted value % | Oil measured value % | Relative Error % |
| 1 | 0.83 | 0.86 | -3.49 |
| 2 | 1.31 | 1.29 | 1.55 |
| 3 | 3.23 | 3.28 | -1.52 |
| 4 | 2.23 | 2.25 | -0.89 |
| 5 | 1.03 | 1.07 | -3.74 |
| 6 | 1.8 | 1.82 | -1.1 |
| 7 | 1.43 | 1.41 | 1.42 |
| 8 | 2.93 | 2.97 | -1.34 |
| 9 | 2.78 | 2.84 | -2.11 |
| 10 | 2.23 | 2.29 | -2.62 |
| 11 | 1.36 | 1.36 | 0 |
| 12 | 0.96 | 0.97 | -1.03 |
| 13 | 1.61 | 1.59 | 1.26 |
| 14 | 1.29 | 1.33 | -3.01 |
| 15 | 2.53 | 2.54 | -0.39 |
| 16 | 2.77 | 2.75 | 0.73 |
| 17 | 2.14 | 2.13 | 0.47 |
| 18 | 2 | 1.98 | 1.01 |
| 19 | 3.78 | 3.82 | -1.05 |
| 20 | 3.18 | 3.2 | -0.63 |
By the result in table 2 it can be shown that fresh tobacco leaves oil predicted value and measured value difference are smaller, prediction model it is pre-
It is accurate to survey result.Time of measuring foreshortens to 5min by several hours of conventional dry gravimetric method, and detection efficiency greatly improves.Measurement
As a result it matches with conventional method, error is less than 10%.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (5)
1. a kind of detection method of fresh tobacco leaves oil, which comprises the steps of:
Step a, measurement fresh tobacco leaves upper surface capacitor capacitor and calculate between lower surface capacitor and upper and lower surface, obtain upper surface
Capacitance per unit lengthC On , lower surface capacitance per unit lengthC Under And capacitance per unit length between blade upper and lower surfaceC Between ；
Wherein, capacitance per unit length value measures the ratio of capacitor and its distance between two test points, unit be pico farad/centimetre；
Step b calculates capacitance per unit length numerical value obtained in step a in formula (I), and fresh tobacco leaves oil can be obtained
The mass percentage divided；
O Oil contains rate =0.34×C On +0.98×C Under +0.23×C Between , formula (I), whereinO Oil contains rate % is the quality hundred of fresh tobacco leaves oil
Divide content.
2. the detection method of fresh tobacco leaves oil according to claim 1, which is characterized in that test point avoids leaf vein,
And two lines between test point does not span across leaf vein.
3. the detection method of fresh tobacco leaves oil according to claim 1 or 2, which is characterized in that fresh tobacco leaves upper surface
Capacitor is both needed to measurement repeatedly between capacitor, lower surface capacitor and upper and lower surface, the upper surface capacitance per unit length being calculatedC On , under
Surface unit length capacitorC Under And capacitance per unit length between blade upper and lower surfaceC Between Respectively take the equal of its multiple survey calculation result
Value.
4. the detection method of fresh tobacco leaves oil according to claim 1, which is characterized in that measurement fresh tobacco leaves upper surface
Between capacitor, lower surface capacitor and upper and lower surface when capacitor, it is both needed to measure in tobacco leaf blade tip, leaf with phyllopodium three parts.
5. the detection method of fresh tobacco leaves oil according to claim 1, which is characterized in that the measurement is specifically to distinguish
Capacitance per unit length in selection tobacco leaf blade tip, leaf between phyllopodium three parts detection upper surface, lower surface and upper and lower surface, every portion
Sorting is surveyed number and is no less than 3 times, and is averaged to all measurement data.
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