CN109459483A - The method of real-time of ethylene gas content in fruit lab environment - Google Patents
The method of real-time of ethylene gas content in fruit lab environment Download PDFInfo
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- CN109459483A CN109459483A CN201811226980.1A CN201811226980A CN109459483A CN 109459483 A CN109459483 A CN 109459483A CN 201811226980 A CN201811226980 A CN 201811226980A CN 109459483 A CN109459483 A CN 109459483A
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- ethylene
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/622—Ion mobility spectrometry
Abstract
The present invention discloses the method for real-time of ethylene gas content in a seed pod lab environment, gaseous sample is acquired from environment by gas automatic sampling device, gaseous sample enters optical ionization ion mobility after dehumidification device purifies and composes, gaseous sample is formed ethylene product ion by photo-ionisation by optical ionization ion mobility spectrum, ethylene product ion enters migration area by the ion gate that pulse is opened, it is separated in migration area according to the difference of mobility, Faraday plate detector is reached to be detected, it is finally received by signal and receives and detect with detection system, form ion mobility spectrometry spectrogram, the Real Time Monitoring of ethylene gas content in environment is realized by the real-time monitoring of the transit time to ethylene characteristic peak and signal strength again.The method of real-time of ethylene gas content in fruit lab environment of the present invention, with high sensitivity, detection speed is fast, simple operation and other advantages, the ethylene gas content generated in fruits and vegetables Cold Chain Logistics transportational process can be recorded in real time, provide theoretical foundation for fruits and vegetables cold chain transportation and storage technique.
Description
Technical field
The invention belongs to analytical chemistry fields and technical field of food safety detection, more particularly to one kind to be based on Ion transfer
The method of real-time of ethylene gas content in the fruit lab environment of spectral technology.
Background technique
Ethylene is simplest unsaturated hydrocarbon, and molecular formula is C2H4, and relative molecular mass is 28.05, ethylene
It is a kind of lesser gas of molecular weight at a temperature of physiological environment, ethylene is a Plant Hormone, is adjusting fruit maturation and is promoting
It is played an important role into organ senescence aspect, it is generally existing in the various tissues, organ and fruit of plant, it is by methionine
Be transformed in the case where supplying oxygen sufficiency, ethylene contents raising is process necessary to fruits and vegetables are mature, climacteric type fruit at
Will appear the phenomenon that ethylene contents increase before ripe beginning, it is a double-edged sword that ethylene is for the mature not only advantageous of fruits and vegetables but also has disadvantage,
In the prematuration period of fruit, ethylene mainly passes through the accumulation for promoting nutrient constituents of fruit, and the variation of fruit color and quality makes fruit
It is real mature, after fruit maturation, ethylene that fruit itself generates but fruit postmaturity can be made until rotting, influence fruit
Therefore storage effectively monitors the ethylene contents in the storage environment of fruit library, when to guaranteeing inventory's fruit quality, extending fruit storage
Between etc. have great importance.
Currently, the detection of ethylene gas mainly uses gas-chromatography, spectroscopy, chemistry and electrochemical sensor, these
Method has the shortcomings that expensive, sensitivity is low, can not be portable, and ion mobility spectrometry is under a kind of atmospheric pressure according to ion
Migration velocity difference in the electric field carries out the analysis means of rapid survey gas molecule in space, has high sensitivity, analysis speed fast,
It is easy to operate, cheap, small in size to be easy to the advantages that portable, low in energy consumption, particularly suitable for the real-time of escaping gas ingredient
On-line monitoring analysis.
Summary of the invention
The purpose of the present invention is provide one kind and be advantageously implemented fruit vegetables storing to deficiency existing for existing ethylene detection technique
In environment in the fruit lab environment of the real time on-line monitoring of ethylene gas ethylene gas content method of real-time.
Present invention technical solution used for the above purpose is: the reality of ethylene gas content in a seed pod lab environment
When monitoring method, gaseous sample is acquired from environment by gas automatic sampling device, gaseous sample is after dehumidification device purifies
It is composed into optical ionization ion mobility, gaseous sample is formed ethylene product ion, second by photo-ionisation by optical ionization ion mobility spectrum
Ene product ion enters migration area by the ion gate that pulse is opened, and is separated in migration area according to the difference of mobility,
It reaches Faraday plate detector to be detected, is finally received by signal and receive and detect with detection system, form ion mobility spectrometry
Spectrogram, then ethylene gas content in environment is realized by the real-time monitoring of the transit time to ethylene characteristic peak and signal strength
Real Time Monitoring.
The optical ionization ion mobility spectrum is composed using the optical ionization ion mobility of positive ion mode.
The optical ionization ion mobility spectrum is using vacuum UV lamp as ionization source, purified air or nitrogen as drift
Gas.
The gas automatic sampling device is to compose to add aspiration pump at air inlet in optical ionization ion mobility, passes through gas stream
Amount controller controls gas pumping speed, realizes the continuous acquisition of ethylene sample in environmental gas.
The dehumidification device is used to remove the moisture in environmental gas, reduces humidity and does to ethylene gas detection sensitivity
It disturbs.
The dehumidizer that the dehumidification device uses is one or more of no water sodium hydroxide, silica gel or molecular sieve.
The method of real-time of ethylene gas content in a seed pod lab environment of the invention, utilizes optical ionization ion mobility spectrum pair
Ethylene gas is detected, and is eliminated influence of the ambient humidity to ethylene detection sensitivity in conjunction with dehumidification device, is realized ethylene gas
High sensitivity quickly detection；The real-time acquisition that ethylene sample is realized using gas automatic sampling device, by software systems
In continuously monitor the variation that ethylene composes the characteristic peak signal intensity to be formed in optical ionization ion mobility, realize ethylene gas content
Real-time monitoring.
Detailed description of the invention
Fig. 1 is the operation principle schematic diagram of the method for real-time of ethylene gas content in a seed pod lab environment of the invention.
Specific embodiment
As shown in Figure 1, in fruit lab environment shown in the method for real-time operation principle schematic diagram of ethylene gas content, entirely
Device includes dehumidification device 2, gas automatic sampling fills 3, optical ionization ion mobility spectrum 4 and data acquire and monitoring system 5, entirely
Monitoring process is as follows: environmental gas 1 removes moisture therein by dehumidification device 2 under the action of gas automatic sampling device 3,
Into in optical ionization ion mobility spectrum 4, in the photon effect that ion mobility spectrometry ionization source vacuum ultraviolet-ionization lamp 6 is launched
Under, ethylene molecule occurs Single-photon ionization and forms feature product ion, and the ion that feature is formed after the separation of migration area moves
Spectrum spectrogram is moved, the feature spectrogram of formation is after data are acquired and acquired with monitoring system 5, to the production of ethylene molecule in software systems
The signal strength at object ion characteristic peak is monitored, and by comparing with standard curve, realizes ethylene contents in environmental gas
Real-time monitoring, gas automatic sampling device by aspiration pump realize environmental sample automatic sampling, by flowmeter control adopt
The speed of sample, dehumidification device are mainly used for removing the moisture in environmental gas, eliminate humidity to ethylene gas detection sensitivity
Influence, ion mobility spectrometry include ionization source, reaction zone, ion gate, migration area and five part of Faraday plate detector composition.
Ion mobility spectrometry is quickly to be surveyed under a kind of atmospheric pressure according to the migration velocity difference of ion in the electric field
The analysis means of gas molecule in space are measured, have high sensitivity, analysis speed fast, it is easy to operate, cheap, small in size to be easy to just
The advantages that taking, is low in energy consumption, the real time on-line monitoring particularly suitable for escaping gas ingredient are analyzed, second in fruit lab environment of the present invention
The method of real-time of alkene gas content detects ethylene gas using optical ionization ion mobility spectrum, in conjunction with dehumidification device
Influence of the ambient humidity to ethylene detection sensitivity is eliminated, realizes the high sensitivity quickly detection of ethylene gas；Certainly using gas
Dynamic sampling apparatus realizes the real-time acquisition of ethylene sample, by continuously monitoring ethylene in optical ionization ion mobility in software systems
The variation of the characteristic peak signal intensity formed is composed, realizes the real-time monitoring of ethylene gas content.
Claims (6)
1. the method for real-time of ethylene gas content in a seed pod lab environment, it is characterised in that: filled by gas automatic sampling
It sets and acquires gaseous sample from environment, gaseous sample enters optical ionization ion mobility after dehumidification device purifies and composes, and photoelectricity is luxuriant
Gaseous sample is formed ethylene product ion, the ion gate that ethylene product ion is opened by pulse by photo-ionisation by sub- migration spectrum
It into migration area, is separated in migration area according to the difference of mobility, reaches Faraday plate detector and detected, finally
It is received by signal and receives and detect with detection system, form ion mobility spectrometry spectrogram, then when by migration to ethylene characteristic peak
Between and signal strength real-time monitoring realize environment in ethylene gas content Real Time Monitoring.
2. the method for real-time of ethylene gas content in seed pod lab environment according to claim 1, it is characterised in that:
The optical ionization ion mobility spectrum is composed using the optical ionization ion mobility of positive ion mode.
3. the method for real-time of ethylene gas content in seed pod lab environment according to claim 1, it is characterised in that:
The optical ionization ion mobility spectrum is using vacuum UV lamp as ionization source, purified air or nitrogen as drift gas.
4. the method for real-time of ethylene gas content in seed pod lab environment according to claim 1, it is characterised in that:
The gas automatic sampling device is to compose to add aspiration pump at air inlet in optical ionization ion mobility, passes through gas flow controller
Gas pumping speed is controlled, realizes the continuous acquisition of ethylene sample in environmental gas.
5. the method for real-time of ethylene gas content in seed pod lab environment according to claim 1, it is characterised in that:
The dehumidification device is used to remove the moisture in environmental gas, reduces interference of the humidity to ethylene gas detection sensitivity.
6. the method for real-time of ethylene gas content in seed pod lab environment according to claim 5, it is characterised in that:
The dehumidizer that the dehumidification device uses is one or more of no water sodium hydroxide, silica gel or molecular sieve.
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| CN201811226980.1A CN109459483A (en) | 2018-10-22 | 2018-10-22 | The method of real-time of ethylene gas content in fruit lab environment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110672708A (en) * | 2019-10-28 | 2020-01-10 | 大连工业大学 | Ethylene detection method based on ion mobility spectrometry technology |
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| W.A.CHUPKA ET AL.: "Photoionization of Ethylene with Mass Analysis", 《THE JOURNAL OF CHEMICAL PHYSICS》 * |
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| CN110672708A (en) * | 2019-10-28 | 2020-01-10 | 大连工业大学 | Ethylene detection method based on ion mobility spectrometry technology |
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