Rapid pesticide residue detector

Abstract

The rapid pesticide residue detector comprises a base shell, a battery is arranged in the base shell, the upper end of the base shell is sunken downwards to form a placement groove, a weighing sensor is arranged at the bottom of the placement groove, and a detachable sample cup is arranged at the position, at the upper end of the weighing sensor, of the placement groove; the detection cover is detachably connected with the upper end of the sample cup and is hollow, a connecting lantern ring is arranged at the lower end of the detection cover, an ultrasonic vibrator is arranged in the detection shell, a detection column is downwards arranged at the lower end of the detection cover, and an enzyme biosensor is arranged at the lower end of the detection column; a control panel is arranged on the front side of the base shell, a display screen and a plurality of control buttons are arranged on the control panel, an integrated circuit board is arranged in the detection shell, and a cable is connected between the base shell and the detection shell. The method is combined with the ultrasonic technology to accelerate pesticide extraction, can effectively shorten the detection time, and is suitable for on-site rapid detection.

Description

Technical Field

[0001] The invention relates to the technical field of pesticide residue detection, and in particular to a rapid pesticide residue detection instrument. Background Art

[0002] With the increasing popularity of pesticide use in modern agricultural production, the problem of pesticide residues in agricultural products has gradually become the focus of public attention. Pesticide residues not only affect the health and safety of consumers, but also pose a potential threat to the environment. Therefore, the development of efficient and accurate pesticide residue detection technology has become an important part of ensuring food safety.

[0003] Early pesticide residue detection mainly relied on bioassay methods, such as insect toxicity assays. Although these methods can provide certain reference information, their accuracy and sensitivity are low and it is difficult to meet the requirements of modern food safety standards. Subsequently, chemical analysis methods such as gas chromatography (GC), liquid chromatography (LC) and mass spectrometry (such as GC-MS, LC-MS) were introduced into the field of pesticide residue detection, significantly improving the accuracy and reliability of detection. However, these high-precision analysis techniques often require that the sample pretreatment process must be meticulous and rigorous to ensure the authenticity and effectiveness of the test results.

[0004] Before conducting pesticide residue testing, a key step is to extract the pesticide residues on the surface of agricultural products. This process usually involves using a specific extraction solution to dissolve and collect the pesticide components on the surface of agricultural products. Although there are various extraction methods available, including oscillation extraction, ultrasound-assisted extraction, microwave-assisted extraction, etc., in actual operation, no matter which method is used, it takes a long time for the pesticide components to fully dissolve into the extraction solution, which undoubtedly prolongs the time required for the entire detection process. Summary of the invention

[0005] The purpose of the present invention is to provide a rapid pesticide residue detector, which combines ultrasonic technology to accelerate pesticide extraction, can effectively shorten the detection time, is suitable for on-site rapid detection, and effectively ensures people's food safety.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a rapid pesticide residue detector, comprising a base shell, a battery is arranged in the base shell, the upper end of the base shell is recessed downward to form a placement groove, a weighing sensor is arranged at the bottom of the placement groove, and a detachable sample cup with an open upper end is arranged at the upper end of the weighing sensor in the placement groove;

[0007] It also includes a hollow detection cover that is detachably connected to the upper end of the sample cup, a connecting ring that covers the upper end of the sample cup is disposed at the lower end of the detection cover, an ultrasonic vibrator is disposed in the detection shell, a vibrating rod of the ultrasonic vibrator extends downward from the connecting ring, a detection column that extends downward from the connecting ring is disposed downward from the lower end of the detection cover, and an enzyme biosensor is disposed at the lower end of the detection column;

[0008] A control panel is arranged on the front side of the base shell, on which a display screen and a plurality of control buttons are arranged, an integrated circuit board is arranged in the detection shell, on which a smart chip is arranged, a cable is connected between the base shell and the detection shell, the ultrasonic vibrator and the enzyme biosensor are electrically connected to the integrated circuit board, and the battery, the weighing sensor, the display screen and the control buttons are all electrically connected to the integrated circuit board via the cable.

[0009] By adopting the above technical scheme, firstly, the sample cup is placed in the placement slot, and the weight of the empty sample cup is reset once by operating the button; the vegetables to be tested are cut into small pieces and put into the sample cup, and the weight of the vegetables at this time is recorded by operating the button; a proper amount of pesticide extract is added to the sample cup, and the agricultural extract can be petroleum ether, acetone, dichloromethane or ethyl acetate, and the weight at this time is recorded again by operating the button, and the weight of the cut vegetables is the weight of the added pesticide extract; the upper end of the sample cup is covered with a detection cover, so that the vibration rod and the detection frame of the ultrasonic vibrator are extended into the extract of the sample cup, and the ultrasonic vibrator generates high-frequency vibration to form tiny particles in the liquid. The energy generated when these bubbles burst can effectively peel off the pesticide residues attached to the surface of vegetables or even the shallow layer inside, so that the pesticides are fully dissolved in the pesticide extract; the enzyme biosensor detects the concentration of pesticides in the pesticide extract (the presence of pesticides in the solution will inhibit the activity of the enzyme on the enzyme biosensor, resulting in a change in the difference in current after inhibition. The greater the inhibition rate, the higher the concentration of pesticide residues in the test solution, that is, the smaller the inhibition rate, the lower the concentration of pesticide residues in the test solution); finally, the total content of the pesticide extract is automatically calculated based on the weight of the pesticide extract and the detected pesticide concentration, and finally the pesticide content in the vegetables is automatically calculated based on the weight of the vegetables.

[0010] The present invention is further configured as follows: a movable support plate connected to the upper end of the weighing sensor is movably arranged in the placement groove, and the sample cup is arranged at the upper end of the movable support plate.

[0011] The present invention is further configured as follows: the sample cup is made of a transparent material.

[0012] The present invention is further configured as follows: a capacity scale is provided on the outside of the sample cup.

[0013] The present invention is further configured as follows: a microwave generator is installed in the base shell on the outer periphery of the placement groove, facing the inside thereof and electrically connected to the integrated circuit board.

[0014] The present invention is further configured as follows: a detection frame with open sides and a sealed lower end is provided at the lower end of the detection column, and the enzyme biosensor is arranged at the top of the detection frame.

[0015] The present invention is further configured as follows: the enzyme biosensor is an acetylcholinesterase sensor.

[0016] The present invention is further configured as follows: a charging socket electrically connected to the battery is provided on one side of the base shell.

[0017] In summary, the present invention has the following beneficial effects:

[0018] First, the present invention utilizes an ultrasonic vibrator to generate high-frequency vibrations to effectively peel off pesticide residues attached to the surface of vegetables, and combined with a microwave generator, the pesticides on the surface of agricultural products can be quickly dissolved into the extract, effectively shortening the waiting time for pesticide extraction and shortening the detection time;

[0019] Secondly, the present invention can quickly obtain the pesticide content in the vegetables after cutting the vegetables into small pieces and putting them into a sample cup and adding the pesticide extract. The operation is simple and convenient, and the instrument is simple and compact, which is suitable for on-site or home testing;

[0020] Thirdly, the present invention can automatically and quickly calculate the pesticide content in vegetables by combining the enzyme biosensor with the weighing sensor. This is simple and convenient, and there is no need to deliberately control the sample amount and the amount of the pesticide extract, making it more convenient and quick to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a partial cross-sectional view for showing the internal structure of the base shell;

[0023] Figure 3 A vibrating rod and an enzyme biosensor for displaying the lower end of the detection cover;

[0024] Figure 4 It is a partial cross-sectional view used to show the internal structure of the detection cover.

[0025] In the figure: 1. base shell; 11. battery; 12. charging socket; 13. placement slot; 14. microwave generator; 2. weighing sensor; 21. movable support plate; 3. sample cup; 4. detection cover; 41. connecting ring; 5. ultrasonic vibrator; 51. vibrating rod; 6. detection column; 61. detection frame; 62. enzyme biosensor; 7. control panel; 71. display screen; 72. control button; 8. integrated circuit board; 81. smart chip; 9. cable. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0027] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0028] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example, see Figure 1-4A rapid pesticide residue detector includes a base shell 1, a battery 11 is arranged in the base shell 1, a charging socket 12 electrically connected to the battery 11 is arranged on one side of the base shell 1, the upper end of the base shell 1 is recessed downward to form a placement groove 13, a weighing sensor 2 is arranged at the bottom of the placement groove 13, a movable support plate 21 connected to the upper end of the weighing sensor 2 is movably arranged in the placement groove 13, a detachable sample cup 3 with an open upper end is arranged at the upper end of the movable support plate 21 of the placement groove 13, the sample cup 3 is made of transparent material, and a capacity scale is arranged on the outer side of the sample cup 3, a microwave generator 14 facing the inside of the placement groove 13 is installed on the outer periphery of the placement groove 13 in the base shell 1, and the microwave generator 14 can quickly heat the solution in the sample cup 3 when it works.

[0031] The invention also includes a hollow detection cover 4 which is detachably connected to the upper end of the sample cup 3. The lower end of the detection cover 4 is provided with a connecting ring 41 which covers the upper end of the sample cup 3. An ultrasonic vibrator 5 is provided in the detection shell. A vibration rod 51 of the ultrasonic vibrator 5 extends downward from the connecting ring 41. The vibration rod 51 of the ultrasonic vibrator 5 extends into the solution in the sample cup 3 to perform ultrasonic vibration, which helps to speed up the extraction of pesticides. A detection column 6 which extends downward from the connecting ring 41 is provided downward at the lower end of the detection cover 4. A detection frame 61 which is open on the side and sealed at the lower end is provided at the lower end of the detection column 6. An enzyme biosensor 62 is provided on the top of the detection frame 61. The enzyme biosensor 62 is an acetylcholinesterase sensor. The acetylcholinesterase sensor can directly detect the concentration of pesticides in the solution.

[0032] A control panel 7 is provided on the front side of the base shell 1, and a display screen 71 and a plurality of control buttons 72 are provided on the control panel 7. An integrated circuit board 8 is provided in the detection shell, and an intelligent chip 81 is provided on the integrated circuit board 8. A cable 9 is connected between the base shell 1 and the detection shell, the ultrasonic vibrator 5 and the enzyme biosensor 62 are electrically connected to the integrated circuit board 8, and the battery 11, the weighing sensor 2, the microwave generator 14, the display screen 71 and the control buttons 72 are all electrically connected to the integrated circuit board 8 through the cable 9.

[0033] Working method: first, place the sample cup 3 into the placement slot 13, and reset the weight of the empty sample cup 3 by operating the buttons; cut the vegetables to be tested into small pieces and put them into the sample cup 3, and record the weight of the vegetables at this time by operating the buttons; add an appropriate amount of pesticide extract into the sample cup 3, and the agricultural extract can be petroleum ether, acetone, dichloromethane or ethyl acetate, and record the weight at this time by operating the buttons again, and the weight of the cut vegetables is the weight of the added pesticide extract; cover the upper end of the sample cup 3 with the detection cover 4, so that the vibration rod 51 and the detection frame 61 of the ultrasonic vibrator 5 are both extended into the extract of the sample cup 3, and the ultrasonic vibrator generates high-frequency vibration when it works, forming tiny bubbles in the liquid, and the energy generated when these bubbles burst can The pesticide residues attached to the surface of vegetables or even the shallow inner layer can be effectively stripped off, so that the pesticides are fully dissolved in the pesticide extract, and the microwave generator 14 can also be started to quickly heat the extract to further accelerate the dissolution of the pesticide in the extract; the enzyme biosensor 62 detects the concentration of the pesticide in the pesticide extract (the presence of pesticides in the solution will inhibit the activity of the enzyme on the enzyme biosensor 62, resulting in a change in the difference in current after inhibition, and the greater the inhibition rate, the higher the concentration of the pesticide residue in the detection solution, that is, the smaller the inhibition rate, the lower the concentration of the pesticide residue in the detection solution); finally, the total content of the pesticide extract is automatically calculated based on the weight of the pesticide extract and the detected pesticide concentration, and finally the pesticide content in the vegetables is automatically calculated based on the weight of the vegetables.

[0034] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A rapid pesticide residue detector, comprising a base housing (1), characterized in that: A battery (11) is arranged in the base shell (1); the upper end of the base shell (1) is recessed downward to form a placement groove (13); a weighing sensor (2) is arranged at the bottom of the placement groove (13); and a detachable sample cup (3) with an open upper end is arranged at the upper end of the weighing sensor (2) in the placement groove (13); It also comprises a hollow detection cover (4) which is detachably connected to the upper end of the sample cup (3); the lower end of the detection cover (4) is provided with a connecting ring (41) which covers the upper end of the sample cup (3); an ultrasonic vibrator (5) is provided in the detection shell; a vibration rod (51) of the ultrasonic vibrator (5) extends downward from the connecting ring (41); the lower end of the detection cover (4) is provided with a detection column (6) which extends downward from the connecting ring (41); and the lower end of the detection column (6) is provided with an enzyme biosensor (62); A control panel (7) is arranged on the front side of the base shell (1), and a display screen (71) and a plurality of control buttons (72) are arranged on the control panel (7); an integrated circuit board (8) is arranged in the detection shell, and an intelligent chip (81) is arranged on the integrated circuit board (8); a cable (9) is connected between the base shell (1) and the detection shell; the ultrasonic vibrator (5) and the enzyme biosensor (62) are electrically connected to the integrated circuit board (8); and the battery (11), the weighing sensor (2), the display screen (71) and the control buttons (72) are all electrically connected to the integrated circuit board (8) via the cable (9).

2. A rapid pesticide residue detector according to claim 1, characterized in that: A movable support plate (21) connected to the upper end of the weighing sensor (2) is movably arranged in the placement groove (13), and the sample cup (3) is arranged on the upper end of the movable support plate (21).

3. A rapid pesticide residue detector according to claim 1, characterized in that: The sample cup (3) is made of transparent material.

4. A rapid pesticide residue detector according to claim 3, characterized in that: The outer side of the sample cup (3) is provided with a capacity scale.

5. A rapid pesticide residue detector according to claim 1, characterized in that: A microwave generator (14) is installed on the outer periphery of the placement groove (13) in the base shell (1), facing the inside thereof and electrically connected to the integrated circuit board (8).

6. A rapid pesticide residue detector according to claim 1, characterized in that: The lower end of the detection column (6) is provided with a detection frame (61) with an open side and a sealed lower end, and the enzyme biosensor (62) is arranged at the top of the detection frame (61).

7. A rapid pesticide residue detector according to claim 1, characterized in that: The enzyme biosensor (62) is an acetylcholinesterase sensor.

8. A rapid pesticide residue detector according to claim 1, characterized in that: A charging socket (12) electrically connected to the battery (11) is provided on one side of the base housing (1).

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