CN110780045A - Method for detecting quality of linseed oil - Google Patents

Method for detecting quality of linseed oil Download PDF

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CN110780045A
CN110780045A CN201911176476.XA CN201911176476A CN110780045A CN 110780045 A CN110780045 A CN 110780045A CN 201911176476 A CN201911176476 A CN 201911176476A CN 110780045 A CN110780045 A CN 110780045A
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detection
linseed oil
sensor
detection chamber
nitrogen
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李春生
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Gansu Yutailong Ecological Agriculture Co Ltd
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    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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    • G01N33/03—Edible oils or edible fats

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Abstract

The invention provides a method for detecting the quality of linseed oil, relates to the technical field of oil detection, solves the technical problems of high oil product detection cost, time and labor waste of the conventional linseed oil, and comprises the following steps: linseed oil vaporization: stirring liquid linseed oil by a stirrer, filling nitrogen with a certain temperature at a stable speed for purging, and feeding the obtained mixed gas of the nitrogen and the linseed oil into a concentration tank for concentration; step two, concentration; the concentration tank is pressurized to increase the density of the linseed oil in the concentration tank, so that a gas sensor in a subsequent detection chamber can effectively contact the linseed oil, and the accuracy of a detection result is ensured; step three, detection; discharging the concentrated mixed gas of linseed oil and nitrogen into a detection chamber, and detecting by using a gas sensor; step four, processing data: and respectively processing the data measured by the gas sensors of the first detection group, the second detection group and the third detection group in the five detection chambers.

Description

Method for detecting quality of linseed oil
Technical Field
The invention relates to the technical field of oil detection, in particular to a method for detecting the quality of linseed oil.
Background
Flax (the scientific name: Linum usittissimum L) is an annual herbaceous plant and can be divided into three types of fiber flax, oil flax and oil fiber flax, wherein flax (flaxseed, seed) is also called flax seed and is a mature seed of flax, and in China, the flax seeds are mainly produced in China and are respectively Gansu Qingyang, Huixing, Shanxi Qinling, Hebei Shanbei, the area above the dam, inner Mongolia area, Shanxi, Ningxia, Qinghai, Xinjiang, Heilongjiang and Yunnan, the flax seeds are mainly used as oil for producing and processing edible vegetable oil, the main components of the flax seeds are fat, protein and dietary fiber, other components also comprise mineral substances, α -linolenic acid, lignan, flaxseed gum, vitamins and the like, scientific research shows that the flax seeds contain cyanogen glycosides, substances such as VB6 factors, phytic acid and the like or anti-nutritional factors, and the flax seed oil contains a large amount of unsaturated fatty acids, so that atherosclerosis and high toxicity are prevented.
The linseed oil has rich types and contents of fragrant substances, obvious fragrance characteristics, and obviously different types of flax and seed oil fragrance qualities of different preparation processes. According to the national standard, the linseed oil is divided into linseed crude oil, pressed finished linseed oil and leached finished linseed oil. The pressed linseed oil product can be divided into primary and secondary. The leached finished linseed oil can be divided into first-level, second-level, third-level and fourth-level. At present, a lot of families begin to eat linseed oil, but the market of linseed oil is various and disordered. The quality of linseed oil is very important when people buy it. However, the quality classification evaluation of linseed oil still mainly relies on sensory evaluation, and the identification result is influenced by various factors including age, experience, identification environment and the like of an identifier. Even if the discriminator is experienced, the discriminator can be influenced by various accidental factors, and the discrimination capability of the ordinary person is more difficult to predict; in addition, if the linseed oil needs to be classified on a large scale, the method for artificial sensory identification is low in efficiency, and the reliability of the identification result cannot be guaranteed.
In the prior art, the quality detection of the edible oil is difficult to be generally applied to common consumers although the method is various. At present, the most accurate edible oil quality detection method is a chemical analysis method, can perform quantitative and qualitative analysis on components of edible oil, directly judges the content of harmful substances in a sample and determines whether high-quality oil with high purity is obtained or not according to the content of the components, but has longer test time and higher instrument cost, can be developed only in some special laboratories, and is difficult to popularize in the public. Some common detection methods such as a physicochemical detection method mainly aim at the differences that some inferior oil (such as illegal cooking oil) has higher acid value and iodine value, more oxidation products, more metal ions and the like compared with normal edible oil, and the quality of the edible oil is judged by using chromatographic and colorimetric analysis methods. In addition, some detection methods for separating mixed oil by directly seeing the appearance and adding common reagents are not suitable for use with the advanced edible oil adulteration method and the continuous improvement of the edible oil squeezing method. In view of the above-mentioned drawbacks in the prior art, a need exists to develop a method for detecting the quality of linseed oil, which solves the drawbacks in the prior art.
Disclosure of Invention
The invention aims to provide a method for detecting the quality of flaxseed oil, which solves the technical problems of high cost, time and labor waste of flaxseed oil product detection in the current market.
In order to solve the technical problems, the invention adopts the following technical scheme: the production process of the linseed oil quality detection method comprises the following steps of:
the invention provides a method for detecting the quality of linseed oil, which comprises the following steps:
step one, vaporizing linseed oil: placing linseed oil into a closed container provided with a stirrer, starting the stirrer, introducing nitrogen with stable flow rate and constant temperature into the closed container containing the linseed oil, and discharging the nitrogen obtained after purging the linseed oil into a concentration tank;
step two, concentration: keeping the temperature in the concentration tank consistent with the temperature of the nitrogen filled in the closed space filled with the linseed oil, pressurizing the concentration tank by a booster pump until the concentration of the gaseous linseed oil in the concentration tank reaches, and discharging the gas in the concentration tank into a detection device;
step three, detection: the detection device comprises 5 detection chambers which are sequentially arranged from left to right, an inlet is formed in the top of each detection chamber, each detection chamber is cylindrical, a first detection group, a second detection group and a third detection group are sequentially arranged in each detection chamber from top to bottom, each first detection group, each second detection group and each third detection group respectively comprise five gas sensors A, B, C, D and E with different types, and the five gas sensors are equidistantly distributed along the circumference of each detection chamber;
step four, processing data: comparing the measured value with the template data after the data processing to judge whether the quality of the linseed oil meets the standard or not; the data processing method comprises the following steps:
Figure BDA0002290086950000021
Figure BDA0002290086950000022
(k 1+k 2+k 3+k 4+k 5＝1；j＝1,2,3,4,5)
Figure BDA0002290086950000023
the value measured by the sensor A of the ith detection group in a certain detection chamber;
Figure BDA0002290086950000024
the value measured by the sensor B of the ith detection group in a certain detection chamber;
Figure BDA0002290086950000025
the value measured by the sensor C of the ith detection group in a certain detection chamber;
Figure BDA0002290086950000026
the value measured by the sensor D of the ith detection group in a certain detection chamber; the value measured by the sensor E of the ith detection group in a certain detection chamber;
Figure BDA0002290086950000028
the measured value of the sensor A in the jth detection chamber;
Figure BDA0002290086950000029
the measured value of the sensor B in the jth detection chamber;
Figure BDA00022900869500000210
the measured value of the sensor C in the jth detection chamber;
Figure BDA00022900869500000211
the measured value of a sensor D in the jth detection chamber;
Figure BDA0002290086950000031
the measured value of a sensor E in the jth detection chamber; x is the number of iCalculating the value obtained in the ith detection chamber according to the value measured by the gas sensor; k is a radical of 1、k 2、k 3、k 4And k 5Sensors A, B, C, D and E at x, respectively iThe weight occupied.
Preferably, the rotating speed of the stirrer in the first step is 30 rpm.
Preferably, the flow rate of nitrogen in the first step is 0.5-1 m/s.
Preferably, the flow rate of the nitrogen gas is 0.7 m/s.
Preferably, the temperature of the nitrogen in the first step is 30-60 ℃.
Preferably, the temperature of the nitrogen gas is 45 ℃.
Preferably, k is as defined in step four 1、k 2、k 3、k 4And k 5The values of (A) are 0.15, 0.2, 0.15, 0.2 and 0.3 respectively.
The invention has the beneficial effects that: the method adopts five detection chambers, a plurality of gas sensors with the same type are arranged at the same positions in the five detection chambers to detect the quality of the gaseous linseed oil, and the data detected by the gas sensors are processed and then compared with the template data, so that the quality of the linseed oil can be rapidly and accurately identified; simultaneously, the gas sensors with the same type are selected, so that errors caused by the type difference of the gas sensors can be reduced, and the detection precision of the linseed oil quality can be greatly improved by arranging the positions of the gas sensors and processing detected data.
Drawings
FIG. 1 is a schematic view of the structure of a detection chamber according to the present invention;
FIG. 2 is a top view of the detection chamber of the present invention;
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1
A method for detecting the quality of linseed oil comprises the following steps:
step one, vaporizing linseed oil: placing linseed oil into a closed container provided with a stirrer, starting the stirrer, introducing nitrogen with stable flow rate and constant temperature into the closed container containing the linseed oil, and discharging the nitrogen obtained after purging the linseed oil into a concentration tank;
step two, concentration: keeping the temperature in the concentration tank consistent with the temperature of the nitrogen filled in the closed space filled with the linseed oil, pressurizing the concentration tank by a booster pump until the concentration of the gaseous linseed oil in the concentration tank reaches, and discharging the gas in the concentration tank into a detection device;
step three, detection: the detection device comprises 5 detection chambers which are sequentially arranged from left to right, an inlet is formed in the top of each detection chamber, the detection chambers are cylindrical, a first detection group, a second detection group and a third detection group are sequentially arranged in the detection chambers from top to bottom, the first detection group, the second detection group and the third detection group respectively comprise five gas sensors A, B, C, D and E with different models, wherein the sensors A, B, C, D and E are respectively MQ136, SNC4000, MQ135, NE-HCHO and TGS2620, and the five gas sensors are equidistantly distributed along the circumference of the detection chambers;
step four, processing data: comparing the measured value with template data after data processing to judge whether the quality of the linseed oil meets the standard, wherein a processor for processing the measured data is STM32F103, and a protocol adopted by data transmission is USART; the data processing method comprises the following steps:
Figure BDA0002290086950000041
(k 1+k 2+k 3+k 4+k 5＝1；j＝1,2,3,4,5)
Figure BDA0002290086950000043
the value measured by the sensor A of the ith detection group in a certain detection chamber;
Figure BDA0002290086950000044
the value measured by the sensor B of the ith detection group in a certain detection chamber; the value measured by the sensor C of the ith detection group in a certain detection chamber;
Figure BDA0002290086950000046
the value measured by the sensor D of the ith detection group in a certain detection chamber; the value measured by the sensor E of the ith detection group in a certain detection chamber;
Figure BDA0002290086950000048
the measured value of the sensor A in the jth detection chamber; the measured value of the sensor B in the jth detection chamber; the measured value of the sensor C in the jth detection chamber;
Figure BDA00022900869500000411
the measured value of a sensor D in the jth detection chamber;
Figure BDA00022900869500000412
the measured value of a sensor E in the jth detection chamber; x is the number of iCalculating the value obtained in the ith detection chamber according to the value measured by the gas sensor; k is a radical of 1、k 2、k 3、k 4And k 5Sensors A, B, C, D and E at x, respectively iThe weight occupied.
Preferably, the rotating speed of the stirrer in the first step is 30 rpm.
Preferably, the flow rate of nitrogen in the first step is 0.5-1 m/s.
Preferably, the flow rate of the nitrogen gas is 0.7 m/s.
Preferably, the temperature of the nitrogen in the first step is 30-60 ℃.
Preferably, the temperature of the nitrogen gas is 45 ℃.
Preferably, k is as defined in step four 1、k 2、k 3、k 4And k 5The values of (A) are 0.15, 0.2, 0.15, 0.2 and 0.3 respectively.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the scope of the present invention are intended to be included therein.

Claims (7)

1. A method for detecting the quality of linseed oil is characterized by comprising the following steps:
step one, vaporizing linseed oil: placing linseed oil into a closed container provided with a stirrer, starting the stirrer, introducing nitrogen with stable flow rate and constant temperature into the closed container containing the linseed oil, and discharging the nitrogen obtained after purging the linseed oil into a concentration tank;
step two, concentration: keeping the temperature in the concentration tank consistent with the temperature of the nitrogen filled in the closed space filled with the linseed oil, pressurizing the concentration tank by a booster pump until the concentration of the gaseous linseed oil in the concentration tank reaches, and discharging the gas in the concentration tank into a detection device;
step three, detection: the detection device comprises 5 detection chambers which are sequentially arranged from left to right, an inlet is formed in the top of each detection chamber, each detection chamber is cylindrical, a first detection group, a second detection group and a third detection group are sequentially arranged in each detection chamber from top to bottom, each first detection group, each second detection group and each third detection group respectively comprise five gas sensors A, B, C, D and E with different types, and the five gas sensors are equidistantly distributed along the circumference of each detection chamber;
step four, processing data: comparing the measured value with the template data after the data processing to judge whether the quality of the linseed oil meets the standard or not; the data processing method comprises the following steps:
Figure FDA0002290086940000011
Figure FDA0002290086940000012
Figure FDA0002290086940000013
the value measured by the sensor A of the ith detection group in a certain detection chamber;
Figure FDA0002290086940000014
the value measured by the sensor B of the ith detection group in a certain detection chamber;
Figure FDA0002290086940000015
the value measured by the sensor C of the ith detection group in a certain detection chamber;
Figure FDA0002290086940000016
the value measured by the sensor D of the ith detection group in a certain detection chamber;
Figure FDA0002290086940000017
the value measured by the sensor E of the ith detection group in a certain detection chamber;
Figure FDA0002290086940000018
the measured value of the sensor A in the jth detection chamber;
Figure FDA0002290086940000019
the measured value of the sensor B in the jth detection chamber;
Figure FDA00022900869400000110
the measured value of the sensor C in the jth detection chamber; the measured value of a sensor D in the jth detection chamber;
Figure FDA00022900869400000112
the measured value of a sensor E in the jth detection chamber; x is the number of iCalculating the value obtained in the ith detection chamber according to the value measured by the gas sensor; k is a radical of 1、k 2、k 3、k 4And k 5Sensors A, B, C, D and E at x, respectively iThe weight occupied.
2. The method of claim 1, wherein the first step comprises a stirrer rotating at 30 rpm.
3. The method of claim 1, wherein the flow rate of nitrogen in the first step is 0.5-1 m/s.
4. The method of claim 3, wherein the flow rate of the nitrogen is 0.7 m/s.
5. The method of claim 1, wherein the temperature of the nitrogen in the first step is 30-60 ℃.
6. The method of claim 5, wherein the temperature of the nitrogen is 45 ℃.
7. The method of claim 1, wherein k is the same as k in step four 1、k 2、k 3、k 4And k 5The values of (A) are 0.15, 0.2, 0.15, 0.2 and 0.3 respectively.
CN201911176476.XA 2019-11-26 2019-11-26 Method for detecting quality of linseed oil Pending CN110780045A (en)

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102721794A (en) * 2012-06-26 2012-10-10 郑州炜盛电子科技有限公司 Fast detection method of illegal cooking oil
CN204882528U (en) * 2015-07-17 2015-12-16 成都汉康信息产业有限公司 Edible oil quality detection device
CN105651952A (en) * 2016-04-04 2016-06-08 浙江理工大学 Method for improving quality detection precision of linseed oil
CN105866359A (en) * 2016-04-04 2016-08-17 浙江理工大学 Edible oil quality testing system
CN105891431A (en) * 2016-04-04 2016-08-24 浙江理工大学 Linseed oil quality detection method
WO2017156598A1 (en) * 2016-03-18 2017-09-21 Katholieke Universiteit Leuven Ku Leuven Research & Development Non-thermal plasma system for accelerated ageing of organic samples
CN206657004U (en) * 2017-04-26 2017-11-21 杭州敦和科技有限公司 Edible oil quality detection means
US20180038777A1 (en) * 2016-08-28 2018-02-08 Alireza Ghiasvand Polypyrrole/graphene oxide nanocomposite-coated fiber located in a capillary tube reinforced by a vacuum system for assessment of oxidative stability of edible oils
CN207366488U (en) * 2017-09-09 2018-05-15 深圳市赛亿科技开发有限公司 A kind of device based on electronic nose detection gutter oil
CN209656651U (en) * 2018-12-29 2019-11-19 江苏微谱检测技术有限公司 SO 2 in waste gas detection device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102721794A (en) * 2012-06-26 2012-10-10 郑州炜盛电子科技有限公司 Fast detection method of illegal cooking oil
CN204882528U (en) * 2015-07-17 2015-12-16 成都汉康信息产业有限公司 Edible oil quality detection device
WO2017156598A1 (en) * 2016-03-18 2017-09-21 Katholieke Universiteit Leuven Ku Leuven Research & Development Non-thermal plasma system for accelerated ageing of organic samples
CN105651952A (en) * 2016-04-04 2016-06-08 浙江理工大学 Method for improving quality detection precision of linseed oil
CN105866359A (en) * 2016-04-04 2016-08-17 浙江理工大学 Edible oil quality testing system
CN105891431A (en) * 2016-04-04 2016-08-24 浙江理工大学 Linseed oil quality detection method
US20180038777A1 (en) * 2016-08-28 2018-02-08 Alireza Ghiasvand Polypyrrole/graphene oxide nanocomposite-coated fiber located in a capillary tube reinforced by a vacuum system for assessment of oxidative stability of edible oils
CN206657004U (en) * 2017-04-26 2017-11-21 杭州敦和科技有限公司 Edible oil quality detection means
CN207366488U (en) * 2017-09-09 2018-05-15 深圳市赛亿科技开发有限公司 A kind of device based on electronic nose detection gutter oil
CN209656651U (en) * 2018-12-29 2019-11-19 江苏微谱检测技术有限公司 SO 2 in waste gas detection device

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Application publication date: 20200211