CN217304573U - Supernatant transfer device and sample pretreatment system for detecting plasticizer in edible oil - Google Patents
Supernatant transfer device and sample pretreatment system for detecting plasticizer in edible oil Download PDFInfo
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- CN217304573U CN217304573U CN202221054373.3U CN202221054373U CN217304573U CN 217304573 U CN217304573 U CN 217304573U CN 202221054373 U CN202221054373 U CN 202221054373U CN 217304573 U CN217304573 U CN 217304573U
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Abstract
The utility model provides a plasticizer detects uses sample pretreatment system in supernatant transfer device and edible oil belongs to food detection technology field. The supernatant transfer device comprises a first test tube plug and a second test tube plug, the first test tube plug is provided with an air inlet pipe and a supernatant discharge pipe, and the air inlet pipe is provided with an air inlet control valve; the supernatant discharging pipe penetrates through the first test tube plug and extends downwards to a first depth. And the second test tube plug is provided with a supernatant feeding pipe and an exhaust pipe, the supernatant feeding pipe is connected with the supernatant discharging pipe, and the exhaust pipe is emptied. Adopt the utility model discloses a supernatant transfer device, only need be equipped with the test tube of sample with first test tube stopper is connected, opens into air control valve, can realize the transfer of supernatant, and convenient operation reduces experimenter's operation intensity, prevents that the sample from unrestrained, realizes the accuracy and moves and get the supernatant.
Description
Technical Field
The utility model belongs to the technical field of food detection, in particular to plasticizer detects uses sample pretreatment system in supernatant transfer device and the edible oil.
Background
The edible oil is an important component of food and is a seasoning essential for daily life of people. Among them, plasticizers such as phthalate esters (diethyl phthalate (DEP), dibutyl phthalate (DBP), butyl phthalate (BBP), di (2-ethylhexyl) phthalate (DEHP), di-n-octyl phthalate (DnOP)), which are not linked to plastic polymers through chemical bonds and are fat-soluble substances, are liable to enter edible oil during production, storage, etc., resulting in contamination of edible oil.
In order to search key transfer nodes of the plasticizer in the edible oil, sampling is carried out on each key node in the production of the edible oil, and the content of the plasticizer in each node sample is detected according to a detection method shown in 'determination method of phthalate in export food' (SN/T3147-2017) so as to judge the migration rule of the plasticizer. The specific detection method comprises the following steps: weighing about 0.5g of sample in a 10mL glass scale test tube, adding 3mL of acetonitrile, adding 0.1mL of n-hexane, carrying out vortex mixing for 1min, adding 0.6g of anhydrous magnesium sulfate and 0.15g of sodium acetate, carrying out vortex mixing for 3min, centrifuging, transferring the supernatant into another test tube, adding 25mg of PSA powder, 25mgC18 powder and 75mg of anhydrous magnesium sulfate, carrying out vortex mixing for 1min, centrifuging at 3000r/min for 5min, transferring the supernatant into another clean test tube, blowing nitrogen to dry, accurately transferring 2mL of n-hexane for redissolving, and analyzing by GC-MC.
In the above detection process, at least two supernatant transfer processes and one nitrogen blow-drying process need to be completed. At present, in the laboratory, the transfer of supernatant mainly moves through the experimenter operation pipette and gets, and when treating the sample quantity that detects more, the experimenter work load is great, and in the supernatant transfer process, has and is difficult to accurate sample, appears the unrestrained problem of sample easily.
SUMMERY OF THE UTILITY MODEL
Based on the above, the invention provides a supernatant transfer device and a sample pretreatment system for detecting a plasticizer in edible oil, and aims to solve the technical problems that in the prior art, when the content of the plasticizer in the edible oil is detected, the workload of an experimenter is large, accurate sampling is difficult, and a sample is easy to spill.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
a supernatant transfer device comprising:
the first test tube plug is provided with an air inlet pipe and a supernatant liquid discharging pipe, the air inlet pipe is used for introducing gas, and the air inlet pipe is provided with an air inlet control valve; the supernatant discharging pipe penetrates through the first test tube plug and extends downwards to a first depth; and
and the second test tube plug is provided with a supernatant feeding pipe and an exhaust pipe, the supernatant feeding pipe is connected with the supernatant discharging pipe, and the exhaust pipe is emptied.
Preferably, the supernatant feeding pipe is connected to the supernatant discharging pipe through a connecting hose.
Preferably, the supernatant outlet pipe passes through the first test tube plug and extends downward to a first depth, and the first depth can be adjusted.
Preferably, a protective sleeve is arranged on the first test tube plug, the supernatant discharging pipe penetrates through the protective sleeve, and the outer diameter of the supernatant discharging pipe is equal to the inner diameter of the protective sleeve.
Preferably, the discharge end of supernatant inlet pipe is provided with the buffer tank, the pipe diameter of buffer tank is greater than the pipe diameter of supernatant inlet pipe, the relief hole is seted up to the bottom of buffer tank.
Preferably, a purging pipe is arranged on the air inlet pipe, and a purging control valve is arranged on the purging pipe.
A sample pretreatment system for detecting a plasticizer in edible oil comprises the supernatant transfer device.
Preferably, the sample pretreatment system for detecting the plasticizer in the edible oil further comprises a plasticizer extraction test tube and a supernatant receiving test tube, wherein the open end of the plasticizer extraction test tube can be covered by the first test tube plug, and the supernatant discharging tube is positioned in the plasticizer extraction test tube; the open end of the supernatant receiving test tube can be covered by the second test tube plug.
Preferably, the sample pretreatment system for detecting the plasticizer in the edible oil further comprises a solvent volumetric flask and a washing liquid volumetric flask, wherein the open end of the solvent volumetric flask can be covered by the first test tube stopper, and the supernatant liquid discharge tube is positioned in the solvent volumetric flask; the open end of the volumetric flask of washing liquid can be closed by the second test tube stopper.
Compared with the prior art, the utility model discloses at least, following advantage has:
through setting up first test tube stopper and second test tube stopper, connect the supernatant discharging pipe that is used for letting in gaseous intake pipe and is used for discharging the supernatant on first test tube stopper, set up the supernatant inlet pipe that is used for leading-in supernatant and be used for the blast pipe of exhaust gas on second test tube stopper. When carrying out plasticizer detection operation in the edible oil, the sample that awaits measuring is after reagent extraction and edulcoration, will be equipped with the test tube of sample with first test tube stopper is connected for the lower extreme of supernatant discharging pipe is located supernatant layer, and will be used for accepting the test tube of supernatant with the second test tube stopper is connected. And opening the air inlet control valve, introducing air, and pressing the supernatant into a test tube for receiving the supernatant through the supernatant discharge pipe and the supernatant feed pipe under the action of air pressure. When the liquid level in the test tube filled with the sample is lower than the lower end of the supernatant discharging tube, gas enters the supernatant discharging tube and the supernatant feeding tube, and residual supernatant in the supernatant discharging tube and the supernatant feeding tube is blown into the test tube for carrying the supernatant. On one hand, the supernatant transfer device provided by the invention is used for replacing a pipette, on the other hand, the transfer of the supernatant can be realized only by connecting a test tube filled with a sample with the first test tube plug and opening the air inlet control valve, the operation is convenient, the operation intensity of experimenters is reduced, and the sample is prevented from spilling in the process of transferring the sample by using the pipette. On the other hand, the lower end of the supernatant discharge pipe is immersed into different heights of the supernatant according to actual conditions, so that the supernatant can be accurately separated, and the introduction amount of impurities in the supernatant is reduced.
Drawings
Fig. 1 is a schematic flow chart of an apparatus of a supernatant transfer device according to an embodiment.
Fig. 2 is a partially enlarged view of a portion a shown in fig. 1.
Fig. 3 is a schematic flow chart of an apparatus of a sample pretreatment system for detecting a plasticizer in edible oil according to an embodiment.
Fig. 4 is a schematic view of a usage state of the pretreatment system for detecting the plasticizer in the edible oil according to an embodiment.
In the figure: sample pretreatment system 1 for detecting plasticizer in edible oil, supernatant transfer device 10, first test tube plug 100, air inlet pipe 110, air inlet control valve 111, supernatant discharge pipe 120, protective casing 130, purging pipe 140, purging control valve 141, second test tube plug 200, supernatant inlet pipe 210, buffer tank 211, exhaust pipe 220, connecting hose 300, plasticizer extraction test tube 20, supernatant receiving test tube 30, solvent volumetric flask 40 and washing liquid volumetric flask 50.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The following will be combined with the drawings of the embodiments of the present invention to further describe the technical solution of the present invention, and the present invention is not limited to the following specific embodiments.
It should be understood that the same or similar reference numerals in the drawings of the embodiments correspond to the same or similar parts. In the description of the present invention, it should be understood that if there are the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but not for indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore the terms describing the positional relationship in the drawings are only used for illustrative purposes and should not be construed as limiting the patent, and those skilled in the art can understand the specific meaning of the terms according to the specific situation.
In one embodiment, referring to fig. 1, a supernatant transfer device 10 is used to transfer the supernatant from container a to container B. The supernatant transfer device 10 comprises a first test tube plug 100 and a second test tube plug 200, wherein an air inlet pipe 110 and a supernatant discharge pipe 120 are arranged on the first test tube plug 100, the air inlet pipe 110 is used for introducing gas, and an air inlet control valve 111 is arranged on the air inlet pipe 110. The supernatant discharge pipe 120 passes through the first test tube plug 100 and extends downward to a first depth. And a supernatant feeding pipe 210 and an exhaust pipe 220 are arranged on the second test tube plug 200, the supernatant feeding pipe 210 is connected with the supernatant discharging pipe 120, and the exhaust pipe 220 is emptied.
When carrying out plasticizer detection operation in the edible oil, the sample that awaits measuring is after reagent extraction and edulcoration, will be equipped with the test tube A of sample with first test tube stopper 100 is connected for the lower extreme of supernatant discharging pipe 120 is located the supernatant layer, and will be used for accepting the test tube B of supernatant with second test tube stopper 200 is connected. The air inlet control valve 111 is opened, air is introduced, and the supernatant is pressed into the test tube B for receiving the supernatant through the supernatant discharge pipe 120 and the supernatant feed pipe 210 under the action of air pressure. When the liquid level in the test tube a is lower than the lower end of the supernatant discharge tube 120, gas enters the supernatant discharge tube 120 and the supernatant feed tube 210, and supernatant remaining in the supernatant discharge tube 120 and the supernatant feed tube 210 is blown into the test tube B.
On one hand, the supernatant transfer device 10 provided by the invention is used for replacing a pipette, and on the other hand, the transfer of the supernatant can be realized only by connecting a test tube filled with a sample with the first test tube plug 100 and opening the air inlet control valve 111, so that the operation is convenient, the operation intensity of experimenters is reduced, and the sample is prevented from being scattered in the process of transferring the sample by using the pipette. On the other hand, according to the actual situation, the lower end of the supernatant discharge pipe 120 is immersed at different heights of the supernatant, so that the supernatant can be accurately separated, and the introduction amount of impurities in the supernatant can be reduced.
In one preferred embodiment, the supernatant feed pipe 210 is connected to the supernatant discharge pipe 120 via a connection hose 300. The connection hose 300 may be a rubber hose, a metal hose or a corrugated hose, and the connection hose 300 may be connected to enable the distance and the height difference between the supernatant feeding pipe 210 and the supernatant discharging pipe 120 to be randomly adjusted within a certain range, so as to facilitate installation of the first test tube plug 100 and the second test tube plug 200 at any suitable positions, thereby improving the convenience of use of the supernatant transferring device 10.
In a preferred embodiment, the supernatant outlet pipe 120 passes through the first test tube plug 100 and extends downward to a first depth, which can be adjusted. For example, when the supernatant discharge pipe 120 is inserted into the first test tube stopper 100 and the supernatant discharge pipe 120 is pulled up, the supernatant discharge pipe 120 is pulled out, the first depth is shortened, and when the supernatant discharge pipe 120 is pressed down, the supernatant discharge pipe 120 is pushed into the first test tube stopper 100, and the first depth is lengthened. The degree of the supernatant fluid sinking into the lower end of the supernatant fluid discharge pipe 120 is adjusted by adjusting the depth of the supernatant fluid discharge pipe 120 penetrating through the first test tube plug 100, so that the supernatant fluid is accurately transferred.
Further, in order to prevent the first test tube plug 100 from being damaged when the first depth of the supernatant discharge tube 120 is adjusted repeatedly, please refer to fig. 2, a protective sleeve 130 is disposed on the first test tube plug 100, the supernatant discharge tube 120 passes through the protective sleeve 130, and an outer diameter of the supernatant discharge tube 120 is equal to an inner diameter of the protective sleeve 130. The supernatant outlet pipe 120 is sleeved with the protective sleeve 130, the sleeved position is kept relatively sealed (complete sealing is not required), and the supernatant outlet pipe 120 can move relative to the protective sleeve 130 under the action of force, so that the first depth of the supernatant outlet pipe 120 can be adjusted.
In an embodiment, for preventing to produce after the supernatant fluid shifts to test tube B and splash, the discharge end of supernatant fluid inlet pipe 210 is provided with buffer tank 211, the pipe diameter of buffer tank 211 is greater than the pipe diameter of supernatant fluid inlet pipe 210, the relief hole is seted up to the bottom of buffer tank 211. The supernatant pressed into the supernatant feeding pipe 210 first releases pressure through the buffer tank 211 and then flows into the test tube B for receiving the supernatant, preventing liquid from splashing due to the pressure.
In still another embodiment, a purge pipe 140 is disposed on the intake pipe 110, and a purge control valve 141 is disposed on the purge pipe 140. On the one hand, when a part of supernatant liquid needs to be taken, the lower end of the supernatant liquid discharge pipe 120 is still submerged below the liquid level after the liquid taking is finished. At this time, the remaining supernatant in the supernatant discharging pipe 120 and the supernatant feeding pipe 210 may be purged into the test tube B for receiving the supernatant through the purge pipe 140. On the other hand, in the detection process of the plasticizer in the edible oil, after the supernatant obtained after secondary impurity removal and centrifugation is transferred to the test tube B for receiving the supernatant, the purge control valve 141 is opened, and the supernatant in the test tube B is dried, so that the processes are reduced, and the operation intensity of experimenters is reduced.
In yet another embodiment of the present invention, a sample pretreatment system 1 for detecting a plasticizer in edible oil includes the supernatant transfer device 10 as described above.
Referring to fig. 3, in one embodiment, the system 1 for pre-treating samples for detecting plasticizers in edible oil further includes a plasticizer extraction tube 20 and a supernatant receiving tube 30, an open end of the plasticizer extraction tube 20 can be covered by the first tube plug 100, and the supernatant discharging tube 120 is located in the plasticizer extraction tube 20. The open end of the supernatant receiving tube 30 can be closed by the second tube stopper 200.
When carrying out plasticizer detection operation in the edible oil, the sample that awaits measuring extracts and behind the edulcoration through reagent, will be equipped with the plasticizer extraction test tube 20 of sample with first test tube stopper 100 is connected for the lower extreme of supernatant discharging pipe 120 is located the supernatant layer, and will be used for bearing the supernatant that connects the supernatant accept test tube 30 with second test tube stopper 200 is connected. The air inlet control valve 111 is opened, air is introduced, and the supernatant is pressed into the supernatant receiving test tube 30 through the supernatant discharge pipe 120 and the supernatant feed pipe 210 under the action of air pressure. When the liquid level in the plasticizer extraction test tube 20 is lower than the lower end of the supernatant discharge tube 120, gas enters the supernatant discharge tube 120 and the supernatant feed tube 210, and supernatant remaining in the supernatant discharge tube 120 and the supernatant feed tube 210 is blown into the supernatant receiving test tube 30.
On the one hand, only need to be equipped with the plasticizer of sample and draw test tube 20 with first test tube stopper 100 is connected, opens into air control valve 111, can realize the transfer of supernatant, and convenient operation reduces experimenter's operation intensity, avoids using the pipette to move the in-process of getting the sample, and the sample appears spilling. On the other hand, according to the actual situation, the lower end of the supernatant discharge pipe 120 is immersed at different heights of the supernatant, so that the supernatant can be accurately separated, and the introduction amount of impurities in the supernatant can be reduced.
Referring to fig. 4, in another embodiment, the system 1 for pretreating samples for detecting plasticizers in edible oil further includes a volumetric flask 40 for solvent and a volumetric flask 50 for washing liquid, wherein an open end of the volumetric flask 40 for solvent can be covered by the first plug 100, and the discharging pipe 120 for supernatant can be located in the volumetric flask 40 for solvent. The open end of the volumetric flask 50 for washing solution can be closed by the second stopper 200.
It is right to need clear solution discharging pipe 120 supernatant inlet pipe 210 and when coupling hose 300 washd, will solvent volumetric flask 40 with first test tube stopper 100 will washing liquid volumetric flask 50 with second test tube stopper 200 is connected, and the ventilation makes the washing solvent in the solvent volumetric flask 40 pass through clear solution discharging pipe 120 supernatant inlet pipe 210 and coupling hose 300 gets into in the washing liquid volumetric flask 50, thereby it is right to accomplish clear solution discharging pipe 120 supernatant inlet pipe 210 and coupling hose 300's washing operation.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A supernatant transfer device, comprising:
the first test tube plug is provided with an air inlet pipe and a supernatant discharging pipe, the air inlet pipe is used for introducing gas, and the air inlet pipe is provided with an air inlet control valve; the supernatant discharging pipe penetrates through the first test tube plug and extends downwards to a first depth; and
and the second test tube plug is provided with a supernatant feeding tube and an exhaust tube, the supernatant feeding tube is connected with the supernatant discharging tube, and the exhaust tube is emptied.
2. The supernatant transfer device of claim 1, wherein the supernatant feed pipe is connected to the supernatant discharge pipe by a connection hose.
3. The supernatant transfer device of claim 2, wherein the supernatant outlet pipe passes through the first test tube plug and extends downward to a first depth, the first depth being adjustable.
4. The supernatant transfer device of claim 3, wherein the first test tube plug is provided with a protective sleeve through which the supernatant outlet pipe passes, and wherein the outer diameter of the supernatant outlet pipe is equal to the inner diameter of the protective sleeve.
5. The supernatant transfer device of claim 1, wherein a buffer tank is arranged at the discharge end of the supernatant feeding pipe, the pipe diameter of the buffer tank is larger than that of the supernatant feeding pipe, and a discharge hole is formed in the bottom of the buffer tank.
6. The supernatant transfer device of claim 1, wherein a purge tube is disposed on the inlet tube, and a purge control valve is disposed on the purge tube.
7. A pretreatment system for a sample for detecting a plasticizer in edible oil, comprising the supernatant transfer device according to any one of claims 1 to 6.
8. The pretreatment system for a sample for detecting a plasticizer in edible oil according to claim 7, further comprising a plasticizer extraction test tube and a supernatant receiving test tube, wherein an open end of the plasticizer extraction test tube is capable of being closed by the first test tube stopper, and the supernatant discharge tube is positioned in the plasticizer extraction test tube; the open end of the supernatant receiving test tube can be covered by the second test tube plug.
9. The pretreatment system for a sample for detecting a plasticizer in edible oil according to claim 7, further comprising a volumetric flask for solvent and a volumetric flask for washing liquid, wherein an open end of the volumetric flask for solvent can be closed by the first test tube stopper, and the discharge tube for supernatant is located in the volumetric flask for solvent; the open end of the volumetric flask of washing liquid can be closed by the second test tube stopper.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221054373.3U CN217304573U (en) | 2022-05-05 | 2022-05-05 | Supernatant transfer device and sample pretreatment system for detecting plasticizer in edible oil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221054373.3U CN217304573U (en) | 2022-05-05 | 2022-05-05 | Supernatant transfer device and sample pretreatment system for detecting plasticizer in edible oil |
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| CN217304573U true CN217304573U (en) | 2022-08-26 |
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| CN202221054373.3U Active CN217304573U (en) | 2022-05-05 | 2022-05-05 | Supernatant transfer device and sample pretreatment system for detecting plasticizer in edible oil |
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| CN (1) | CN217304573U (en) |
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