Sampling tube

Abstract

The invention relates to a sampling tube which comprises a shell and a main adsorption part, a filtering channel is formed in the shell, an inlet and an outlet which are located at the two axial opposite ends of the filtering channel respectively are formed in the shell, the main adsorption part is arranged in the filtering channel in a sleeved mode, and fluid is communicated between the inlet and the outlet; wherein the main adsorption part comprises a porous matrix and a molecularly imprinted polymer loaded on the porous matrix, and the molecularly imprinted polymer selectively adsorbs nicotine. In the sampling pipe, the to-be-detected airflow enters the filtering channel from the inlet of the shell, nicotine in the to-be-detected airflow is adsorbed by the main adsorption piece, and then the to-be-detected airflow is discharged from the outlet. Wherein the porous matrix on the main adsorption part allows an air flow to be detected to flow through the main adsorption part, and meanwhile, the molecularly imprinted polymer loaded on the porous matrix can selectively adsorb nicotine, so that nicotine coexistence and other interference molecules are prevented from being adsorbed, and the adsorption accuracy of nicotine molecules and the subsequent detection precision are improved.

Description

Technical Field

[0001] This application relates to the field of atomization technology, and particularly to a sampling tube. Background Art

[0002] An aerosol is a colloidal dispersion system formed by solid or liquid small particles dispersed and suspended in a gas medium. Since aerosols can be absorbed by the human body through the respiratory system, the aerosol generated by an electronic atomization device atomizing an aerosol generating matrix provides users with a new alternative absorption method.

[0003] In order to detect nicotine in aerosols, the traditional adsorption technology is to use a sampling tube made of glass or stainless steel, and fill porous adsorbents such as activated carbon and silica gel inside the sampling tube, and use the physical adsorption characteristics of the adsorbent to capture nicotine molecules in the aerosol. However, the traditional adsorption tube has insufficient specificity for nicotine adsorption, and is prone to simultaneously capture coexisting components of nicotine such as propylene glycol and glycerol. For example, the adsorption rate of propylene glycol > 35%. Therefore, the traditional adsorption tube not only adsorbs nicotine, but also adsorbs coexisting substances of nicotine, and the coexisting substances of nicotine will interfere with the subsequent detection of nicotine content, resulting in a large detection error. Summary of the Invention

[0004] Based on this, in view of the problem that the traditional adsorption tube is prone to cause subsequent detection errors, it is necessary to provide a sampling tube.

[0005] A sampling tube, comprising:

[0006] A housing, a filtering channel is formed inside the housing, and an inlet and an outlet are respectively provided on the housing at opposite axial ends of the filtering channel; and

[0007] A main adsorbent member, sleeved inside the filtering channel, and fluidly connected between the inlet and the outlet;

[0008] Wherein, the main adsorbent member includes a porous matrix and a molecularly imprinted polymer loaded on the porous matrix, and the molecularly imprinted polymer selectively adsorbs nicotine.

[0009] In some embodiments, the molecularly imprinted polymer is configured as a renewable material.

[0010] In some embodiments, the porous matrix includes at least one of alumina and porous silicon carbide ceramic.

[0011] In some embodiments, the sampling tube includes a pre-filtering member, the pre-filtering member is sleeved inside the filtering channel, and is located between the inlet and the main adsorbent member, and the material of the pre-filtering member is a nanofiber membrane.

[0012] In some of these embodiments, the pre-filter includes at least one of a polyvinylidene fluoride electrospun fiber membrane and an electrospun polyimide membrane.

[0013] In some of these embodiments, the sampling tube includes a protective member that blocks at least one of the inlet and the outlet and allows air flow through.

[0014] In some of these embodiments, the protective member is a droplet barrier layer, and the contact angle of the droplet barrier layer is ≥100°.

[0015] In some of these embodiments, the material of the protective member is at least one of a silane-modified glass fiber woven layer and a polytetrafluoroethylene-coated non-woven fabric.

[0016] In some of these embodiments, the sampling tube includes an anti-nicotine volatilization coating that is coated on the inner wall of the housing and at least covers the outer surface of the main suction member.

[0017] In some of these embodiments, the sampling tube includes a mounting joint. The mounting joint is provided at at least one of the two ends of the housing having the inlet and the outlet, and is used for mounting and connecting with an air extraction member or an air supply member.

[0018] In the above sampling tube, the airflow to be detected enters the filtering channel from the inlet of the housing. After the nicotine in the airflow to be detected is adsorbed by the main suction member, the airflow to be detected is discharged from the outlet. Among them, the main suction member includes a porous matrix and a molecularly imprinted polymer loaded on the porous matrix. The porous matrix allows the airflow to be detected to flow through the main suction member, and at the same time, the molecularly imprinted polymer loaded on the porous matrix can selectively adsorb nicotine. In this way, the molecularly imprinted polymer specifically adsorbs only nicotine molecules, preventing the adsorption of nicotine coexisting substances and other interfering molecules, and improving the adsorption accuracy of nicotine molecules and the subsequent detection accuracy. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of a sampling tube in some embodiments of the present application;

[0020] Figure 2 is a schematic structural diagram of a sampling tube in other embodiments of the present application.

[0021] Description of the reference numerals: 100, sampling tube; 10, outer shell; 11, filtering channel; 13, inlet; 15, outlet; 30, main suction member; 50, pre-filter; 70, protective member; 80, anti-nicotine volatilization layer; 90, mounting joint. Detailed Embodiments

[0022] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present application.

[0024] In addition, the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0025] In the present application, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0026] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath", and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0027] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0028] Refer to Figure 1 , in some embodiments of the present application, a sampling tube 100 is provided. After introducing a prepared air flow into the sampling tube 100, nicotine in the air flow is selectively adsorbed in the sampling tube 100, which can accurately adsorb and collect nicotine in the air flow and improve the accuracy of subsequent detection.

[0029] The sampling tube 100 includes a housing and a main adsorbent 30. A filtering channel 11 is formed in the housing, and an inlet 13 and an outlet 15 located at opposite axial ends of the filtering channel 11 are provided on the housing. The main adsorbent 30 is sleeved in the filtering channel 11 and is fluidly connected between the inlet 13 and the outlet 15. The main adsorbent 30 includes a porous matrix and a molecularly imprinted polymer loaded on the porous matrix, and the molecularly imprinted polymer selectively adsorbs nicotine.

[0030] In this way, the air flow to be detected enters the filtering channel 11 from the inlet 13 of the housing. After the nicotine in the air flow to be detected is adsorbed by the main adsorbent 30, the air flow to be detected is discharged from the outlet 15. Among them, the main adsorbent 30 includes a porous matrix and a molecularly imprinted polymer loaded on the porous matrix. The porous matrix allows the air flow to be detected to flow through the main adsorbent 30, and at the same time, the molecularly imprinted polymer loaded on the porous matrix can selectively adsorb nicotine. In this way, the molecularly imprinted polymer specifically adsorbs only nicotine molecules, preventing the adsorption of nicotine coexisting substances and other interfering molecules, and improving the adsorption accuracy of nicotine molecules and the subsequent detection accuracy.

[0031] It can be understood that molecularly imprinted polymers (MIPs) are an artificially designed highly selective adsorption material, and its preparation process is similar to a "molecular mold": using nicotine as a template molecule, forming a complex with a functional monomer through interactions (such as π-π stacking), and after polymerization and template elution, a three-dimensional cavity that precisely matches the shape, size and functional groups of nicotine molecules is left in the polymer network. This "lock and key" structure enables MIPs to specifically recognize and adsorb nicotine, and the adsorption capacity can reach 5-10 mg / g. Compared with traditional adsorbents, the selectivity of MIPs for nicotine is increased by 3-5 times, which can effectively exclude the interference of nicotine coexisting components and nicotine structural analogs and improve the accuracy of adsorption and detection.

[0032] Furthermore, the molecularly imprinted polymer is constructed as a renewable material. In this way, after the main adsorbent 30 finishes adsorption, the main adsorbent 30 is pulled out of the housing along the axial direction of the filter channel 11 to quickly separate the main adsorbent 30, and the integrity of the structure of the main adsorbent 30 is maintained. Then, the regeneration of the molecularly imprinted polymer in the main adsorbent 30 is achieved through corresponding treatment.

[0033] Specifically, the regeneration process of the molecularly imprinted polymer (MIPs) is divided into two key steps: extraction and activation. First, the main adsorbent 30 after adsorbing nicotine is ultrasonically treated with a 20 mL methanol solution at 40 kHz for 25 - 35 minutes. The extract is filtered through a 0.22 μm filter membrane and then detected by GC-MS or HPLC-MS. Subsequently, regeneration treatment is carried out. The adsorption layer is rinsed three times with pure methanol at a dosage of 50 mL / g of the packing material to thoroughly remove the residual nicotine and restore the π-π interaction sites. After this regeneration, the MIPs material can maintain an initial adsorption capacity of more than 90% and can be reused more than 10 times. This regeneration process ensures the detection accuracy and maintains the selective adsorption performance of the material through solvent desorption and site reconstruction.

[0034] According to some embodiments of the present application, the porous matrix includes at least one of alumina and porous silicon carbide ceramics. That is to say, the main adsorbent 30 can be a composite structure of alumina and the molecularly imprinted polymer. The molecularly imprinted polymer is loaded on the porous matrix made of alumina. Specifically, the molecularly imprinted polymer (MIPs) can be loaded on the porous alumina substrate by in-situ polymerization, surface grafting, or physical coating to form a composite adsorbent material. The alumina substrate, with its high mechanical strength (Mohs hardness 9), multi-level pore structure (macropores 20 - 50 μm, mesopores 2 - 50 nm), excellent thermal / chemical stability (resistant to high temperatures of 500 °C and pH 2 - 12 environments), and the characteristic of being hydrophobically modifiable, can not only significantly improve the physical stability and service life of MIPs, but also optimize the aerosol mass transfer efficiency, enabling the nicotine adsorption capacity of the composite material to reach 4 - 6 mg / g and still maintaining more than 85% of the adsorption performance after 10 regenerations, combining cost-effectiveness and practical reliability.

[0035] Alternatively, the main adsorption component 30 can be a composite structure of porous silicon carbide ceramic and molecularly imprinted polymer, with the molecularly imprinted polymer loaded on the porous silicon carbide ceramic. Specifically, the molecularly imprinted polymer (MIPs) can be loaded on the porous silicon carbide ceramic substrate by in-situ polymerization or surface grafting to form a high-performance composite adsorption material. The porous silicon carbide ceramic substrate has excellent mechanical strength, high thermal stability, chemical inertness, and a unique three-dimensional interconnected pore structure (the adjustable pore size range is 1-100 μm), which not only provides a strong support framework for MIPs but also significantly improves the mass transfer efficiency and the resistance to thermal / chemical shock, enabling the composite material to maintain stable adsorption performance in harsh environments (such as the adsorption efficiency > 90% after 10 regenerations), and is particularly suitable for the selective adsorption and detection of nicotine in high-temperature and corrosive environments.

[0036] See Figure 1 and Figure 2 , according to some embodiments of the present application, the sampling tube 100 includes a pre-filter 50, which is sleeved in the filtering channel 11 and located between the inlet 13 and the main adsorption component 30, and the material of the pre-filter 50 is a nanofiber membrane. By arranging the pre-filter 50 upstream of the main adsorption component 30 in the filtering channel 11, the airflow to be detected flowing in from the inlet 13 first passes through the preliminary filtration of the pre-filter 50 and then flows to the main adsorption component 30 for the adsorption of nicotine molecules. In this way, the pre-filter 50 can filter out some particulate matters, preventing excessive particulate matters from blocking the main adsorption component 30 after flowing into it and ensuring the fluidity of the main adsorption component 30.

[0037] Specifically, the pre-filter 50 is a nanofiber membrane, which is an ultra-thin porous material composed of fibers with diameters in the nanoscale (usually 50-500 nm) prepared by electrospinning, having a high specific surface area (up to 100 m² / g), a tunable pore size distribution (10 nm - 10 μm), and excellent mechanical flexibility. Its three-dimensional network structure can efficiently intercept microparticles, for example, it can achieve a rejection efficiency of > 99.8% for particulate matters with diameters of 1-5 μm.

[0038] Furthermore, the pre-filter 50 includes at least one of a polyvinylidene fluoride electrospun fiber membrane and an electrospun polyimide membrane. The polyvinylidene fluoride (PVDF) electrospun fiber membrane is a nano / micro-scale fiber network material formed by stretching and curing a PVDF polymer solution under the action of a high-voltage electric field through electrospinning technology, having excellent chemical stability, high thermal stability, and unique piezoelectric properties. Its fiber diameter is usually in the range of 100 nm - 2 μm, and the formed porous structure (porosity 70% - 90%) has both high air permeability and good mechanical strength.

[0039] Electrospun polyimide membrane is a nanofiber film material prepared by electrospinning technology, and its core component is polyimide. During the preparation process, the polyimide solution is stretched into micrometer or nanometer-scale fibers under the action of a high-voltage electrostatic field, and then deposited to form a porous mesh structure. This material combines the high temperature resistance, excellent mechanical strength, chemical stability and insulation of polyimide. At the same time, due to the high specific surface area, porosity and flexibility given by the electrospinning process, it can effectively filter particulate matter in the airflow to be detected.

[0040] According to some embodiments of the present application, the sampling tube 100 includes a protective member 70, which blocks at least one of the inlet 13 and the outlet 15 and allows airflow to pass through. In this way, the protective member 70 is provided at the inlet 13 and / or the outlet 15 of the shell to prevent external water vapor and impurities from entering the filter channel 11 through the inlet 13 and the outlet 15, to prevent water vapor and impurities from entering the main adsorbent 30 and destroying the structure of the main adsorbent 30, and to protect the main adsorbent 30. At the same time, the protective member 70 allows airflow to pass normally. The protective member 70 at the inlet 13 allows the airflow to be detected to flow through the protective member 70 and enter the filter channel 11 for filtering and adsorption, and the protective member 70 at the outlet 15 allows the airflow to be detected to be filtered and adsorbed with nicotine before flowing out.

[0041] Furthermore, the protective member 70 is a droplet barrier layer, and the contact angle of the droplet barrier layer is ≥100°. In this way, the protective layer is set as a hydrophobic droplet barrier layer, which can effectively intercept droplets, prevent droplets from flowing toward the main adsorption member 30 along the detection airflow, prevent droplets from clogging the main adsorption member 30, and further protect the main adsorption member 30.

[0042] Optionally, the material of the protective member 70 is at least one of a silane-modified glass fiber woven layer and a polytetrafluoroethylene-coated non-woven fabric, so that the protective member 70 can intercept droplets and impurities and also allow the airflow to be detected to flow through.

[0043] The silane-modified glass fiber braided layer is a reinforcing material formed by weaving glass fibers after surface treatment with a silane coupling agent. The silane coupling agent introduces hydrophobic groups (such as alkyl chains or fluorocarbon chains) on the fiber surface by chemical grafting, significantly reducing the surface energy of the material, making it exhibit excellent hydrophobicity, effectively blocking water penetration and reducing the erosion of the fiber-resin interface by environmental moisture. This modification not only improves the hydrophobicity, but also retains the inherent high strength, corrosion resistance and high porosity of the glass fiber, allowing the airflow to be detected to flow through the polytetrafluoroethylene coated non-woven fabric into the filter channel 11, or allowing the airflow to be detected to flow through the polytetrafluoroethylene coated non-woven fabric out of the filter channel 11, and blocking water vapor and impurities from entering the filter channel 11.

[0044] The polytetrafluoroethylene (PTFE) - coated non - woven fabric is a composite functional material formed by coating a polytetrafluoroethylene polymer material on the surface of the non - woven fabric. Polytetrafluoroethylene (commonly known as "Teflon") has an extremely low surface energy. In its molecular structure, fluorine atoms are closely arranged to form a highly hydrophobic and chemically inert surface. After coating, the non - woven fabric exhibits excellent hydrophobicity - with a large contact angle (usually exceeding 110°), making it difficult for water to wet or penetrate, and water droplets are likely to roll off, having a self - cleaning effect. In addition, this material combines the characteristics of the high porosity of the non - woven fabric, allowing the airflow to be detected to flow through the PTFE - coated non - woven fabric into the filtration channel 11, or allowing the airflow to be detected to flow out of the filtration channel 11 through the PTFE - coated non - woven fabric, and blocking water vapor and impurities from entering the filtration channel 11.

[0045] Specifically, protective members 70 are provided at both the inlet 13 and the outlet 15 of the housing. The protective member 70 at the inlet 13 intercepts droplets in the airflow to be detected, and the protective member 70 at the outlet 15 can prevent external water vapor and impurities from entering the filtration channel 11. In this way, both the inlet 13 and the outlet 15 of the filtration channel 11 are protected, comprehensively protecting the main suction member 30.

[0046] According to some embodiments of the present application, the sampling tube 100 includes an anti - nicotine - volatilization layer 80. The anti - nicotine - volatilization layer 80 is coated on the inner wall of the housing, and the anti - nicotine - volatilization layer 80 at least covers the outer surface of the main suction member 30. In this way, by coating the anti - nicotine - volatilization layer 80 on the inner wall of the housing, the volatilization loss of nicotine is reduced, and the accuracy of adsorption and subsequent detection is improved.

[0047] Moreover, the anti - nicotine - volatilization layer 80 at least covers the outer surface of the main suction member 30, which can block the volatilization of nicotine in a large range and reduce the volatilization loss of nicotine.

[0048] According to some embodiments of the present application, the sampling tube 100 includes a mounting joint 90. The mounting joint 90 is provided at at least one end of the two ends of the housing having the inlet 13 and the outlet 15. The mounting joint 90 is used for mounting and connecting with an air - pumping member or an air - sending member. In this way, when the mounting joint 90 is provided at the end of the housing having the inlet 13, it is convenient to connect the sampling tube 100 with the air - sending member. The air - sending member can be a hose or other components, and the airflow to be detected is sent into the sampling tube 100 through the air - sending member for filtration and adsorption. Or, when the mounting joint 90 is provided at the end of the housing having the outlet 15, it is convenient to connect the sampling tube 100 with the air - pumping member. The air - pumping member can be an air pump, and after the airflow to be detected flows through the main suction member 30 inside the housing, it can flow from the sampling tube 100 to the air - pumping member.

[0049] Further, the installation joint 90 is integrally injection-molded with the housing, which is convenient for use and does not require separate assembly of the installation joint 90, thus facilitating use. It can be understood that in some other embodiments, the installation joint 90 and the housing can also be separately formed and then assembled, which is not limited herein. Optionally, the installation joint 90 is configured as an annular tube with internal threads, so that the installation joint 90 can be installed by threaded connection with the air supply part or the air extraction part.

[0050] Specifically, in one embodiment, the sampling tube 100 includes a housing, two installation joints 90, two protective parts 70, a pre-filter 50 and a main filter. The housing is configured as a tubular structure with a hollow cavity. Inside the housing, a protective part 70, a pre-filter 50, a main adsorption part 30 and another protective part 70 are sequentially arranged along the axial direction. Installation joints 90 are provided at both ends of the axial ends of the housing. In this way, the formed sampling tube 100 can effectively and accurately adsorb nicotine molecules in the airflow to be detected. At the same time, under the protection of the protective part 70 and the pre-filter 50, the main adsorption part 30 can maintain good fluidity and adsorption performance.

[0051] In addition, the main adsorption part 30 includes a porous matrix and a molecularly imprinted polymer loaded on the porous matrix. The porous matrix allows the airflow to be detected to flow through the main adsorption part 30. At the same time, the molecularly imprinted polymer loaded on the porous matrix can selectively adsorb nicotine. In this way, the molecularly imprinted polymer specifically adsorbs only nicotine molecules, preventing the adsorption of nicotine coexisting substances and other interfering molecules, and improving the adsorption accuracy of nicotine molecules and the subsequent detection accuracy.

[0052] It can be understood that molecularly imprinted polymers (MIPs) are a kind of artificially designed highly selective adsorption materials, and their preparation process is similar to a "molecular mold": using nicotine as a template molecule, forming a complex with a functional monomer through interactions (such as π-π stacking), and after polymerization and template elution, a three-dimensional cavity that precisely matches the shape, size and functional groups of nicotine molecules is left in the polymer network. This "lock and key" structure enables MIPs to specifically recognize and adsorb nicotine, and the adsorption capacity can reach 5-10 mg / g. Compared with traditional adsorbents, the selectivity of MIPs for nicotine is increased by 3-5 times, which can effectively exclude the interference of nicotine coexisting components and nicotine structure analogs, and improve the accuracy of adsorption and detection.

[0053] Moreover, a pre-filter 50 located upstream of the main adsorption part 30 is arranged in the filtering channel 11. The airflow to be detected flowing in from the inlet 13 first passes through the preliminary filtration of the pre-filter 50 and then flows to the main adsorption part 30 for the adsorption of nicotine molecules. In this way, the pre-filter 50 can filter out some particulate matters, preventing too many particulate matters from blocking the main adsorption part 30 after flowing into the main adsorption part 30, and ensuring the fluidity of the main adsorption part 30.

[0054] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0055] The above-described embodiments only represent several implementation manners of the present application, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A sampling tube, characterized in that, Comprising: A housing, a filtration channel is formed inside the housing, and an inlet and an outlet are provided on the housing at opposite ends of the axial direction of the filtration channel; and A main suction attachment, sleeved inside the filtration channel, and fluidly connected between the inlet and the outlet; Wherein, the main suction attachment includes a porous matrix and a molecularly imprinted polymer loaded on the porous matrix, and the molecularly imprinted polymer selectively adsorbs nicotine.

2. The sampling tube according to claim 1, characterized in that, The molecularly imprinted polymer is configured as a renewable material.

3. The sampling tube according to claim 1, characterized in that, The porous matrix includes at least one of alumina and porous silicon carbide ceramics.

4. The sampling tube according to any one of claims 1-3, characterized in that, The sampling tube includes a pre-filter, the pre-filter is sleeved inside the filtration channel and is located between the inlet and the main suction attachment, and the material of the pre-filter is a nanofiber membrane.

5. The sampling tube according to claim 4, wherein The pre-filter includes at least one of a polyvinylidene fluoride electrospun fiber membrane and an electrospun polyimide membrane.

6. The sampling tube according to any one of claims 1-3, characterized in that, The sampling tube includes a protective member, the protective member blocks at least one of the inlet and the outlet, and allows air flow through.

7. The sampling tube according to claim 6, wherein, The protective member is a droplet barrier layer, and the contact angle of the droplet barrier layer is ≥100°.

8. The sampling tube according to claim 6, characterized in that, The material of the protective member includes at least one of a silane-modified glass fiber woven layer and a polytetrafluoroethylene-coated non-woven fabric.

9. The sampling tube according to any one of claims 1 to 3, characterized in that, The sampling tube includes an anti-nicotine volatilization coating, the anti-nicotine volatilization coating is coated on the inner wall of the housing, and the anti-nicotine volatilization coating at least covers the outer surface of the main suction attachment.

10. The sampling tube according to claim 1, wherein, The sampling tube includes a mounting joint, the mounting joint is provided at at least one of the two ends of the housing having the inlet and the outlet, and the mounting joint is used for mounting and connecting with an air extraction member or an air supply member.

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