A photochemical post-column derivatization device for food detection

Abstract

This utility model relates to the field of photochemical derivatization equipment technology, aiming to solve the problems of existing technologies such as the lack of a UV lamp timing device, inability to control lamp usage time leading to affected derivatization effects, lack of a UV intensity inspection module, reliance on visual observation posing safety risks, and difficulty in timely detection of lamp abnormalities. It provides a photochemical post-column derivatization device for food testing, including a base and a housing. The base has derivatization tubing, and a UV lamp is located above the derivatization tubing. The housing covers the outside of the UV lamp and is detachably connected to the base. A UV intensity inspection window is provided on the housing. The housing also includes a power supply, a switch, and a UV lamp timing device with non-zero timing data and a manual zeroing function. The switch is electrically connected to the UV lamp timing device, the UV lamp, and the power supply. The advantages of this utility model are that it allows control of lamp usage time, does not affect derivatization effects, facilitates observation by staff, reduces safety risks, and facilitates timely detection of lamp abnormalities.

Description

Technical Field

[0001] This utility model relates to the field of photochemical derivatization equipment technology, and more specifically, to a photochemical post-column derivatization device for food detection. Background Technology

[0002] In the field of food testing, photochemical post-column derivatization devices are key equipment for achieving accurate detection of specific components. Their core principle is to use ultraviolet lamps to emit ultraviolet light, causing the food sample flowing through the derivatization pipeline to undergo a photochemical derivatization reaction, providing a derivatized sample that meets the analytical requirements for subsequent detection equipment such as liquid chromatography.

[0003] Currently, while conventional photochemical post-column derivatization devices on the market can basically meet the basic derivatization needs, they have significant technical defects: Firstly, the devices are not equipped with dedicated timing devices for UV lamps, making it impossible for operators to accurately track the cumulative usage time of the lamps. Since the lifespan of UV lamps is typically limited to a fixed duration, exceeding this timeframe leads to UV intensity decay, directly affecting the sufficiency and stability of the photochemical derivatization reaction, thus causing deviations in test results. Secondly, the devices lack a dedicated UV intensity inspection module, relying solely on operators' visual observation of the UV lamp's luminescence to determine its operational status. However, direct UV irradiation can damage the eyes and skin, posing significant operational safety risks. Furthermore, visual observation cannot accurately identify subtle decreases in UV intensity, making it difficult to detect lamp abnormalities in advance and potentially disrupting the food testing process.

[0004] The aforementioned shortcomings make it difficult for existing photochemical post-column derivatization devices to meet the stringent requirements of food testing for result accuracy, process continuity, and personnel safety in terms of detection stability, operational safety, and ease of maintenance. There is an urgent need to optimize and improve the device structure. Utility Model Content

[0005] This invention aims to provide a photochemical post-column derivatization device for food testing, in order to solve the problems in the prior art, such as the lack of a timer for ultraviolet lamps, the inability to control the duration of lamp use which affects the derivatization effect, the lack of an ultraviolet intensity inspection module, the safety risks associated with relying on visual observation, and the difficulty in timely detection of lamp abnormalities.

[0006] The embodiments of this utility model are implemented as follows: This utility model provides a photochemical post-column derivatization device for food detection, which includes a base and a housing; The base is provided with a derivative pipe, which is attached to the top surface of the base, and an ultraviolet lamp is provided above the derivative pipe. The aforementioned outer casing is fitted over the outside of the aforementioned ultraviolet lamp tube and is detachably connected to the aforementioned base; The aforementioned outer casing is provided with an ultraviolet intensity inspection window, which is in communication with the interior of the aforementioned outer casing; The aforementioned housing is also equipped with a power supply, a switch, and a UV lamp timing device that does not reset the timing data but has a manual reset function. The aforementioned switch is electrically connected to the aforementioned UV lamp timing device, the aforementioned UV lamp tube, and the aforementioned power supply, respectively.

[0007] In use, first place the derivatization device stably on the base, connect the power supply on the base or the outer casing, and press the switch on the outside of the outer casing. At this time, the UV lamp timing device and the UV lamp tube start synchronously, and the UV lamp timing device begins to record the cumulative usage time of the UV lamp tube. The food sample to be tested, along with the mobile phase, enters the derivatization tube, which is wrapped around the outside of the UV lamp tube, through the inlet of the derivatization tube. The ultraviolet light emitted by the UV lamp tube performs a photochemical derivatization reaction on the sample in the tube. The derivatized sample is then discharged through the outlet of the derivatization tube. The lamp is then sent to subsequent testing equipment. During use, the UV lamp's operating time can be directly read through the UV lamp timing device display interface on the outer side of the casing to determine if replacement is necessary. When checking UV intensity, open the UV intensity inspection window on the casing, insert the UV intensity test card, and complete the test according to the instructions to understand the lamp's working status. After the test, turn off the switch, the UV lamp will stop working, and the UV lamp timing device will stop timing without resetting the data to zero. It will continue accumulating time upon the next startup. If a timer needs to be reset, the UV lamp timing device can be operated manually.

[0008] This embodiment discloses a photochemical post-column derivatization device for food testing. By integrating the aforementioned UV lamp timing device with the UV intensity inspection window on the outer casing, and combining the rational layout of the base, outer casing, derivatization pipeline, and UV lamp core components, the UV lamp timing device accurately records the cumulative usage time of the UV lamp, facilitating timely replacement of expired UV lamps. The operable UV intensity inspection window allows for safe and convenient UV intensity detection, avoiding the risks associated with visual observation. Furthermore, the surrounding derivatization pipeline and compatible UV lamp ensure sufficient sample derivatization, effectively solving the problems of existing devices lacking timing functions and relying on visual observation. This enables stable, safe, and efficient derivatization, resulting in a photochemical post-column derivatization device for food testing that provides the advantages of monitoring lamp usage time, ensuring unaffected derivatization effects, facilitating staff observation, reducing safety risks, and enabling timely detection of lamp abnormalities.

[0009] Optionally: the above-mentioned derivative pipeline has an inlet and an outlet, both of which penetrate the outer casing. The inlet is connected to a mobile phase storage bottle, and the outlet is connected to a liquid chromatograph.

[0010] This setup allows food test samples, propelled by the mobile phase reservoir, to enter the device via the aforementioned derivatization tubing for photochemical derivatization, and then directly transported to the liquid chromatograph for subsequent detection. This forms a continuous workflow of mobile phase supply, photochemical derivatization, and chromatographic detection, avoiding contamination, loss, or compositional changes during sample transfer after derivatization, thus improving detection accuracy. Simultaneously, it eliminates the need for manual sample transfer, increasing food testing efficiency and meeting the demands for consistent sample processing, timely detection, and reliable results in food testing.

[0011] Optionally: The above-mentioned ultraviolet lamp tube is model T5, the length of the above-mentioned ultraviolet lamp tube is 31cm, and the diameter is 2cm.

[0012] This configuration ensures that the intensity and distribution of ultraviolet light output from the aforementioned ultraviolet lamps are compatible with the layout requirements of the derivatization pipelines within the derivatization device, guaranteeing that food samples undergo sufficient photochemical derivatization reactions within these pipelines and meeting the stability requirements of the derivatization effect. Furthermore, standardized models and precise dimensional parameters facilitate convenient replacement of the aforementioned ultraviolet lamps, while also promoting standardized design and production of the internal structure of the derivatization device, reducing manufacturing and subsequent maintenance costs, and meeting the stability and practicality requirements of food testing scenarios.

[0013] Optionally: The above-mentioned ultraviolet lamp has a power of 8W and a rated voltage of 220V.

[0014] This setup offers several advantages. First, the 8W power output provides sufficient UV intensity for photochemical derivatization in food testing, matching the device's efficiency and effectiveness requirements for sample derivatization reactions while avoiding excessive power consumption. Second, the 220V rated voltage is compatible with everyday power supply environments, eliminating the need for a dedicated transformer and reducing the barrier to entry and associated costs. Combined with the device's timing and intensity detection functions, it ensures stable power supply and efficient derivatization, guaranteeing the continuous and reliable operation of food testing activities.

[0015] Optionally, the aforementioned derivative conduit is wound around the outside of the aforementioned ultraviolet lamp tube and fixed to the aforementioned base.

[0016] This setup serves two purposes. First, it allows the derivatization pipeline to be as close as possible to the ultraviolet emission source, ensuring that the food sample receives ample ultraviolet irradiation as it flows through the pipeline. This guarantees a more uniform and thorough photochemical derivatization reaction, improving the stability of the derivatization effect to meet the requirements for detection accuracy. Second, the base fixing method avoids uneven irradiation caused by the derivatization pipeline shifting during the operation of the device. It also facilitates the installation, maintenance, and replacement of the derivatization pipeline. Combined with the overall structural design of the device, this further ensures the smoothness and reliability of the food testing process.

[0017] Optionally, the ultraviolet lamp timing device is mounted on the upper surface of the housing.

[0018] This configuration keeps the UV lamp timing device away from the base area, preventing potential interference from the layout of the derivative pipelines and equipment operation. This ensures the accuracy of the timing data recorded by the UV lamp timing device, accurately reflecting the cumulative usage time of the UV lamp and providing a reliable basis for replacing the UV lamp when it expires. On the other hand, the installation position on the upper surface of the outer casing allows operators to directly view the timing data without disassembling the device or having close contact with internal components. This simplifies the monitoring process for the usage time of the UV lamp and adapts to the overall structural layout of the derivative device, improving the convenience and practicality of the equipment and ensuring the stable operation of the photochemical derivatization process in food testing.

[0019] Optionally, the ultraviolet intensity inspection window is made of transparent material and is an openable structure.

[0020] This design allows operators to visually observe the color development of the test card inside the UV intensity inspection window without disassembling the derivation device. Furthermore, the openable design facilitates easy insertion and removal of the test card, simplifying operation and avoiding the health risks associated with traditional visual observation of the UV lamps. Combined with the timing function of the derivation device, the working status of the UV lamps can be monitored more efficiently and safely, ensuring the stability and reliability of the photochemical derivation process in food testing.

[0021] Optionally: The power supply mentioned above is an AC power adapter module.

[0022] This configuration converts external 220V AC power into a working voltage compatible with the aforementioned UV lamp and UV lamp timing device, effectively extending the service life of the aforementioned UV lamp and UV lamp timing device.

[0023] Optionally, the timing display interface of the ultraviolet lamp timing device is located on the outer side of the housing.

[0024] This configuration allows operators to directly and quickly read the cumulative usage time of the ultraviolet lamps without disassembling the outer casing or touching the internal components of the derivative device. This significantly simplifies the monitoring process for ultraviolet lamp usage time and avoids monitoring delays caused by cumbersome operations. In addition, the installation position on the outer side reduces the obstruction or interference of the internal pipes and components of the derivative device on the display interface, ensuring that the displayed information is clearly visible. Combined with the derivative device's non-zeroing function after power failure, the remaining lifespan of the ultraviolet lamps can be accurately monitored in real time, providing a direct basis for timely replacement of the ultraviolet lamps. This, in turn, ensures that the ultraviolet light intensity remains stable and meets the standards, ensuring the reliability and continuity of the photochemical derivatization process in food testing.

[0025] Optionally: The above-mentioned derivative pipes are transparent pipes that are resistant to ultraviolet radiation aging.

[0026] This design serves two purposes. First, the UV-resistant aging properties prevent the derivatization tubing from aging and breaking under long-term UV exposure, extending its lifespan and reducing issues such as sample leakage and test interruption caused by tubing damage. Second, the transparent material allows UV light to fully penetrate the derivatization tubing and act on the food sample inside, ensuring a uniform and thorough photochemical derivatization reaction, improving the stability of the derivatization effect to meet the accuracy requirements of the test, and adapting to the overall requirements of the device for efficient and reliable use of the photochemical derivatization process, thus facilitating the smooth operation of food testing activities.

[0027] Optionally, the transparent material of the above-mentioned ultraviolet intensity inspection window is quartz glass, and the thickness of the quartz glass is 1mm to 2mm.

[0028] This design ensures both the penetration of ultraviolet light to guarantee accurate color development of the test card and sufficient strength to prevent damage.

[0029] Optionally, the timing display interface of the above-mentioned ultraviolet lamp timing device is an LED digital screen, and the height of the displayed numbers on the LED digital screen is not less than 5mm.

[0030] With this setup, the LED digital screen features clear display and stable brightness, avoiding interference from ambient light and ensuring that operators can accurately read the cumulative usage time of the ultraviolet lamps. Furthermore, the digital height of at least 5mm meets the reading needs during long-distance or rapid inspections, eliminating the need for close-up viewing of the device. This simplifies the monitoring of ultraviolet lamp usage time. Combined with the timing function of the derivative device for managing the lifespan of the ultraviolet lamps, it provides a more efficient basis for lamp replacement, ensuring the stable operation of the photochemical derivatization process in food testing.

[0031] Optionally, the above-mentioned derivative piping is made of polytetrafluoroethylene (PTFE).

[0032] This design gives the material excellent resistance to ultraviolet radiation aging, preventing aging and cracking caused by long-term exposure to the ultraviolet lamps in the derivatization device. This extends the service life of the derivatization tubing, prevents leakage and contamination of food samples due to tubing damage, and ensures a continuous and stable testing process. Furthermore, the high chemical stability of polytetrafluoroethylene (PTFE) prevents it from reacting with components in the food samples, thus avoiding interference with test results. It also aligns with the installation and fixing requirements of the derivatization tubing. Combined with its arrangement around the ultraviolet lamps, this further ensures the reliability of the photochemical derivatization reaction, meeting the requirements of food testing for sample processing accuracy and safety.

[0033] In summary, the photochemical post-column derivatization device for food testing disclosed in this utility model has the advantages of being able to control the lamp usage time, ensuring that the derivatization effect is not affected, facilitating observation by staff, reducing safety risks, and enabling timely detection of lamp abnormalities. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of a photochemical post-column derivatization device for food detection in an embodiment of this utility model.

[0036] Icons: 1-Base, 2-Outer shell, 3-Derivative tubing, 4-UV lamp, 5-UV intensity inspection window, 6-Power supply, 7-Switch, 8-UV lamp timing device, 9-Liquid inlet, 10-Liquid outlet. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0039] Example See Figure 1 This embodiment proposes a photochemical post-column derivatization device for food detection, including a base 1 and a housing 2; The base 1 is provided with a derivative pipe 3, which is attached to the top surface of the base 1, and an ultraviolet lamp 4 is provided above the derivative pipe 3. The outer casing 2 is placed over the outside of the ultraviolet lamp tube 4 and is detachably connected to the base 1; The outer casing 2 has an ultraviolet intensity inspection window 5, which is connected to the interior of the outer casing 2. The outer casing 2 is also equipped with a power supply 6, a switch 7, and a UV lamp timing device 8 that does not reset the timing data but has a manual reset function. The switch 7 is electrically connected to the UV lamp timing device 8, the UV lamp tube 4, and the power supply 6, respectively.

[0040] In use, first place the derivatization device stably on the base 1, connect the power supply 6 on the base 1 or the outer casing 2, and press the switch 7 on the outside of the outer casing 2. At this time, the UV lamp timing device 8 and the UV lamp tube 4 start synchronously, and the UV lamp timing device 8 begins to record the cumulative usage time of the UV lamp tube 4. The food sample to be tested, along with the mobile phase, enters the derivatization tube 3, which is wrapped around the outside of the UV lamp tube 4, through the inlet of the derivatization tube 3. The ultraviolet light emitted by the UV lamp tube 4 performs a photochemical derivatization reaction on the sample in the tube. The derivatized sample is then transported to the subsequent... The testing equipment allows users to directly read the usage time of the UV lamp tube 4 through the display interface of the UV lamp timing device 8 on the outer side of the housing 2, determining whether replacement is necessary. When checking the UV intensity, open the UV intensity inspection window 5 on the housing 2, insert the UV intensity test card, and complete the test according to the instructions to understand the lamp tube's working status. After the test, turn off the switch 7, the UV lamp tube 4 will stop working, the UV lamp timing device 8 will stop timing and the data will not return to zero. It will continue to accumulate timing the next time it is started. If it is necessary to reset the timing, the UV lamp timing device 8 can be operated manually.

[0041] This embodiment discloses a photochemical post-column derivatization device for food testing. By integrating a UV lamp timing device 8 with a UV intensity inspection window 5 on the outer casing 2, and combining the rational layout of core components such as the base 1, outer casing 2, derivatization tubing 3, and UV lamp 4, the UV lamp timing device 8 accurately records the cumulative usage time of the UV lamp 4, facilitating timely replacement of expired UV lamps 4. The openable UV intensity inspection window 5 allows for safe and convenient detection of UV intensity, avoiding the risks associated with visual observation. Furthermore, the winding derivatization tubing 3 and the compatible UV lamp 4 ensure sufficient sample derivatization, effectively solving the problems of existing devices lacking timing functions and relying on visual observation. This enables stable, safe, and efficient derivatization, resulting in a photochemical post-column derivatization device for food testing that provides the advantages of controlling lamp usage time, ensuring unaffected derivatization effects, facilitating staff observation, reducing safety risks, and enabling timely detection of lamp abnormalities.

[0042] See Figure 1 The derivatization line 3 has an inlet 9 and an outlet 10, both of which penetrate the outer shell 2. The inlet 9 is connected to the mobile phase storage bottle (not shown in the figure), and the outlet 10 is connected to the liquid chromatograph (not shown in the figure). This allows food test samples to be directly transported to the liquid chromatograph for subsequent detection after photochemical derivatization by entering the device through the derivatization line 3, driven by the mobile phase storage bottle. This forms a continuous workflow of mobile phase supply, photochemical derivatization, and chromatographic detection, avoiding contamination, loss, or compositional changes of the sample during the transfer process after derivatization, thus improving detection accuracy. At the same time, it eliminates the need for manual sample transfer, improving the efficiency of food testing and meeting the requirements of continuous sample processing, timely detection, and reliable results in food testing.

[0043] The UV lamp 4 is model T5, with a length of 31cm and a diameter of 2cm. This design ensures that the UV intensity and distribution output by the UV lamp 4 are compatible with the layout requirements of the derivatization pipeline 3 within the derivatization device, guaranteeing that the food sample undergoes a complete photochemical derivatization reaction within the pipeline 3 and meeting the stability requirements of the derivatization effect. Furthermore, the standardized model and precise dimensional parameters allow for easy replacement of the UV lamp 4, while also facilitating the standardized design and production of the internal structure of the derivatization device, reducing manufacturing and subsequent maintenance costs, and meeting the stability and practicality requirements of the equipment in food testing scenarios.

[0044] See Figure 1The UV lamp 4 has a power of 8W and a rated voltage of 220V. On the one hand, the 8W power output can meet the UV intensity requirements of photochemical derivatization in food testing, adapting to the efficiency and effectiveness requirements of the device for sample derivatization reactions, while avoiding excessive power consumption and energy waste. On the other hand, the 220V rated voltage is compatible with everyday power supply environments, eliminating the need for a dedicated transformer, reducing the barrier to entry and associated costs of the device. Combined with the device's timing and intensity detection functions, it can ensure the continuous and reliable conduct of food testing activities based on stable power supply and efficient derivatization.

[0045] The derivatization tube 3 is wound around the outside of the ultraviolet lamp tube 4 and fixed to the base 1. On the one hand, this allows the derivatization tube 3 to be as close as possible to the ultraviolet emission source, so that the food test sample can receive sufficient ultraviolet irradiation when flowing in the derivatization tube 3, ensuring a more uniform and thorough photochemical derivatization reaction, and improving the stability of the derivatization effect to meet the requirements of detection accuracy. On the other hand, the fixing method of the base 1 can avoid the problem of uneven irradiation caused by the derivatization tube 3 shaking and shifting during the operation of the derivatization device. At the same time, it facilitates the installation, maintenance and replacement of the derivatization tube 3. Combined with the overall structural design of the device, it further ensures the smoothness and reliability of the food testing process.

[0046] See Figure 1 The UV lamp timing device 8 is installed on the upper surface of the housing 2. This keeps the UV lamp timing device 8 away from the base 1 area, away from interference that may be caused by the layout of the derivative pipeline 3 and the operation of the equipment. This ensures the accuracy of the timing data recorded by the UV lamp timing device 8, and ensures that it can accurately reflect the cumulative usage time of the UV lamp tube 4, providing a reliable basis for the replacement of the UV lamp tube 4 when it expires. On the other hand, the installation position on the upper surface of the housing 2 makes it easy for operators to directly view the timing data without disassembling the device or having close contact with internal components. This simplifies the monitoring process of the UV lamp tube 4's usage time, while also adapting to the overall structural layout of the derivative device, improving the convenience and practicality of the equipment, and ensuring the stable operation of the photochemical derivative process in food testing.

[0047] The ultraviolet intensity inspection window 5 is made of transparent material and has an openable structure. The transparent material allows operators to directly observe the color development of the test card inside the ultraviolet intensity inspection window 5, and ultraviolet intensity testing can be completed without disassembling the derivation device. In addition, the openable design makes it easy to insert or remove the test card, which is convenient to operate and avoids the health risks that may be caused by directly observing the ultraviolet lamp tube 4 with the naked eye in the traditional way. Combined with the timing function of the derivation device, the working status of the ultraviolet lamp tube 4 can be monitored more efficiently and safely, ensuring the stability and reliability of the photochemical derivation process in food testing.

[0048] See Figure 1The power supply 6 is an AC power supply 6 adapter module, which is used to convert the external 220V AC power into the working voltage of the UV lamp 4 and the UV lamp timing device 8, effectively extending the service life of the UV lamp 4 and the UV lamp timing device 8.

[0049] The timing display interface of the UV lamp timing device 8 is located on the outer side of the housing 2. Operators can directly and quickly read the cumulative usage time of the UV lamp tube 4 without disassembling the housing 2 of the derivative device or touching the internal components. This greatly simplifies the monitoring process of the UV lamp tube 4's usage time and avoids monitoring delays caused by cumbersome operations. In addition, the installation position on the outer side reduces the obstruction or interference of the internal pipelines and components of the derivative device on the display interface, ensuring that the displayed information is clearly visible. Combined with the derivative device's non-zeroing function after power failure, the remaining service life of the UV lamp tube 4 can be accurately grasped in real time, providing an intuitive basis for timely replacement of the UV lamp tube 4. This ensures that the UV light intensity is stably up to standard and guarantees the reliability and continuity of the photochemical derivation process in food testing.

[0050] See Figure 1 The derivatization line 3 is a transparent line resistant to ultraviolet radiation aging. On the one hand, its resistance to ultraviolet radiation aging can prevent the derivatization line 3 from aging and breaking under long-term ultraviolet radiation, thus extending its service life and reducing problems such as sample leakage and detection interruption caused by damage to the derivatization line 3. On the other hand, the transparent material allows ultraviolet rays to fully penetrate the derivatization line 3 and act on the food test sample inside, ensuring that the photochemical derivatization reaction is uniform and thorough, improving the stability of the derivatization effect to meet the requirements of detection accuracy, and adapting to the overall device's requirements for efficient and reliable use of the photochemical derivatization process, thus facilitating the smooth conduct of food testing activities.

[0051] The transparent material of the ultraviolet intensity inspection window 5 is quartz glass, with a thickness of 1mm to 2mm. This ensures both the ultraviolet light penetration to guarantee accurate color development of the test card and sufficient strength to prevent breakage.

[0052] See Figure 1 The timing display interface of the UV lamp timing device 8 is an LED digital screen. The display digit height of the LED digital screen is not less than 5mm. The LED digital screen has the characteristics of clear display and stable brightness, which can avoid the interference of ambient light and ensure that the operator can accurately read the cumulative usage time of the UV lamp tube 4. In addition, the digit height of not less than 5mm can meet the reading needs of long-distance or rapid inspection, without having to look at the device at close range. This simplifies the monitoring operation of the UV lamp tube 4's usage time. Combined with the timing function of the derivative device for the life management of the UV lamp tube 4, it can provide a more efficient basis for the replacement of the UV lamp tube 4, ensuring the stable operation of the photochemical derivative process in food testing.

[0053] The derivatization line 3 is made of polytetrafluoroethylene (PTFE), which has excellent resistance to ultraviolet radiation aging. It can resist aging and cracking caused by long-term exposure to the ultraviolet lamp tube 4 in the derivatization device, extend the service life of the derivatization line 3, and prevent leakage and contamination of food test samples due to damage to the derivatization line 3, thus ensuring the continuous and stable testing process. In addition, PTFE has strong chemical stability and will not react with the components in the food test samples, thus avoiding interference with the test results. At the same time, it is compatible with the installation and fixing requirements of the derivatization line 3. Combined with the arrangement of wrapping around the outside of the ultraviolet lamp tube 4, it can further ensure the reliability of the photochemical derivatization reaction and meet the requirements of food testing for sample processing accuracy and safety.

[0054] See Figure 1 In this embodiment, the photochemical post-column diffraction device for food detection uses base 1 as the supporting foundation. The outer shell 2 is covered on base 1 to form a protective space. The ultraviolet lamp 4 (model T5, length 31cm, diameter 2cm, power 8W, rated voltage 220V) is installed on base 1 and located inside the outer shell 2. The derivation pipeline 3 is wrapped around the outside of the ultraviolet lamp 4 and fixed on base 1. The outer shell 2 is provided with an openable transparent ultraviolet intensity inspection window 5, and an ultraviolet lamp timing device 8 is also installed (the timing display interface is exposed on the outer side of the outer shell 2). The power supply 6 is set on base 1 or outer shell 2. The switch 7 outside the outer shell 2 is electrically connected to the power supply 6, ultraviolet lamp timing device 8 and ultraviolet lamp 4 respectively. When in use, connect the power supply 6 and press the switch 7. The UV lamp timing device 8 and the UV lamp tube 4 will start synchronously. The timing device will start recording the cumulative usage time of the lamp tube (the data will not be reset to zero after power failure, but can be manually reset to zero). When the food test sample flows through the derivatization pipeline 3 with the mobile phase, it will be irradiated by the UV lamp tube 4 to complete photochemical derivatization. The operator can directly read the lamp tube usage time through the timing display interface on the outside of the outer shell 2. The lamp tube intensity can be detected by opening the UV intensity inspection window 5 and inserting a test card. This not only accurately grasps the lamp tube status and ensures the derivatization effect, but also avoids the safety risks of visual observation and ensures the smooth conduct of food testing.

[0055] See Figure 1 The specific operating principle of the photochemical post-column derivatization device for food detection in this embodiment is as follows: In use, connect the power supply 6 and press the switch 7. The UV lamp timing device 8 and the UV lamp tube 4 start synchronously, and the timing device begins to record the cumulative usage time of the lamp tube (the data does not reset to zero after power failure, but can be manually reset to zero). The food test sample enters the pipeline through the inlet 9 of the derivatization pipeline 3 along with the mobile phase. During the process of passing around the UV lamp tube 4, it undergoes a photochemical derivatization reaction under the irradiation of the ultraviolet light emitted by the UV lamp tube 4. The derivatized sample is then transported to the subsequent testing equipment through the outlet 10. During the testing process, the lamp tube usage time can be read visually through the UV lamp timing device 8 on the outer casing 2 to determine whether it needs to be replaced. When it is necessary to check the ultraviolet intensity, open the ultraviolet intensity inspection window 5, insert the test card, and the test can be completed. This allows for timely monitoring of the lamp tube's working status, ensuring stable and efficient derivatization reactions, and guaranteeing the smooth conduct of food testing.

[0056] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A photochemical post-column derivatization device for food detection, characterized in that: Includes a base (1) and a housing (2); The base (1) is provided with a derivative pipe (3), the derivative pipe (3) is attached to the top surface of the base (1), and an ultraviolet lamp (4) is provided above the derivative pipe (3); The outer shell (2) covers the outside of the ultraviolet lamp tube (4) and is detachably connected to the base (1); The outer shell (2) is provided with an ultraviolet intensity inspection window (5), and the ultraviolet intensity inspection window (5) is in communication with the interior of the outer shell (2); The outer casing (2) is also provided with a power supply (6), a switch (7) and a UV lamp timing device (8) whose timing data does not return to zero and has a manual zeroing function. The switch (7) is electrically connected to the UV lamp timing device (8), the UV lamp tube (4) and the power supply (6) respectively.

2. The photochemical post-column derivatization device for food detection according to claim 1, characterized in that: The derivative pipeline (3) has an inlet (9) and an outlet (10), both of which penetrate the outer shell (2). The inlet (9) is connected to the mobile phase storage bottle, and the outlet (10) is connected to the liquid chromatograph.

3. The photochemical post-column derivatization device for food detection according to claim 1, characterized in that: The ultraviolet lamp (4) is model T5, and the ultraviolet lamp (4) is 31cm long and 2cm in diameter.

4. The photochemical post-column derivatization device for food detection according to claim 1, characterized in that: The ultraviolet lamp (4) has a power of 8W and a rated voltage of 220V.

5. The photochemical post-column derivatization device for food detection according to claim 1, characterized in that: The derivative conduit (3) is wound around the outside of the ultraviolet lamp tube (4) and fixed on the base (1).

6. The photochemical post-column derivatization device for food detection according to claim 1, characterized in that: The ultraviolet lamp timing device (8) is installed on the upper surface of the housing (2).

7. The photochemical post-column derivatization device for food detection according to claim 1, characterized in that: The ultraviolet intensity inspection window (5) is made of transparent material and has an openable structure.

8. The photochemical post-column derivatization device for food detection according to claim 1, characterized in that: The power supply (6) is an AC power supply (6) adapter module.

9. A photochemical post-column derivatization device for food detection according to claim 1, characterized in that: The timing display interface of the ultraviolet lamp timing device (8) is located on the outer side of the outer casing (2).

10. A photochemical post-column derivatization device for food detection according to claim 1, characterized in that: The derived pipeline (3) is a transparent pipeline resistant to ultraviolet radiation aging.

Images