CN113813663A - Multifunctional needle type filter for sample pretreatment - Google Patents

Multifunctional needle type filter for sample pretreatment Download PDF

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Publication number
CN113813663A
CN113813663A CN202111157173.0A CN202111157173A CN113813663A CN 113813663 A CN113813663 A CN 113813663A CN 202111157173 A CN202111157173 A CN 202111157173A CN 113813663 A CN113813663 A CN 113813663A
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CN
China
Prior art keywords
filter
sample pretreatment
upper cover
body groove
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111157173.0A
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Chinese (zh)
Inventor
张勇
侯玉
韩来荣
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Napu Analysis Technology Suzhou Co ltd
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Napu Analysis Technology Suzhou Co ltd
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Publication date
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Priority to CN202111157173.0A priority Critical patent/CN113813663A/en
Publication of CN113813663A publication Critical patent/CN113813663A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
    • B01D29/58—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection arranged concentrically or coaxially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/96—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/30—Filter housing constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/30—Filter housing constructions
    • B01D35/306—Filter mounting adapter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/34—Purifying; Cleaning

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Water Supply & Treatment (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

The invention provides a multifunctional needle type filter for sample pretreatment, which comprises: the filter body groove, the upper cover and the adjustable component are in threaded connection with the through hole on the upper cover, and the lower part of the adjustable component extends into the filter body groove; the pre-filtering component is arranged in the filter main body groove and is positioned below the adjustable component; a filter layer and a bottom filter element. Set up adjustable part and prefiltering part for can install different filter layers according to the experiment needs of difference in the filter main part groove of same specification, the filter layer of different thickness can promote prefiltering part through adjustable part and realize suppression and stability to the filter layer, has consequently realized the multipurpose in filter main part groove, need not to customize different needle filter to the experiment of difference, great saving cost, latency, the efficiency of the research of promotion.

Description

Multifunctional needle type filter for sample pretreatment
Technical Field
The invention relates to the field of needle filters for laboratory consumables, in particular to a multifunctional needle filter for sample pretreatment.
Background
The needle filter is a rapid, convenient and reliable filtering tool which is conventionally used in laboratories, is mainly used for applications such as sample pre-filtering, clarification and particle removal, sterilization and filtration of liquid and gas, and is widely applied in the fields of biology, medicine, food, environment, chemical industry and the like.
The needle filters currently used in fluid treatment are of simple construction and generally comprise: the filter comprises a filter upper cover, a filter tank body, a filtering material arranged in the filter tank body and a filtering membrane arranged at the bottom of the filter tank. When the current formal filter is customized according to specific experimental requirements, filter grooves of needle filters with different purposes are different, so that the production and management costs are increased, and in use, when the requirements change, the customization is time-consuming and high in cost, so that the experimental progress is influenced, and therefore a multifunctional needle filter is urgently needed.
Disclosure of Invention
The invention aims to provide a multifunctional needle type filter for sample pretreatment.
In order to achieve the above object, the present invention provides a multi-functional needle filter for sample pretreatment, comprising:
the filter body groove is provided with a cylindrical groove body with a hollow cavity, and the lower end of the filter body groove is provided with a needle tube connecting part;
the upper cover is connected with the upper end of the filter main body groove and is provided with a through hole;
the adjustable component is in threaded connection with the through hole on the upper cover, and the lower part of the adjustable component extends into the filter main body groove;
the pre-filtering component is arranged in the filter main body groove and is positioned below the adjustable component;
the filter layer is arranged in the filter main body groove and is positioned below the pre-filtering component;
and the bottom filtering component is arranged in the filter main body groove and is positioned below the filtering layer.
Set up adjustable part and prefiltering part for can install different filter layers according to the experiment needs of difference in the filter main part groove of same specification, the filter layer of different thickness can promote prefiltering part through adjustable part and realize suppression and stability to the filter layer, has consequently realized the multipurpose in filter main part groove, need not to customize different needle filter to the experiment of difference, great saving cost, latency, the efficiency of the research of promotion.
Furthermore, the adjustable part is a hollow pipeline structure, and a liquid outlet is formed in the side wall of the front end of the screw rod of the adjustable part.
Besides the liquid inlet (liquid inlet pipe) can be arranged on the upper cover as in the prior art, the invention also creatively integrates the liquid inlet pipe and the adjustable component into a whole and further optimizes the structure.
Furthermore, the adjustable component is a piston assembly, the piston assembly comprises a piston rod and a piston part, the piston rod penetrates through the piston part and is provided with a hollow pipeline structure, the piston part is in sealed sliding fit with the inner cavity of the main groove body of the filter, and the piston rod penetrates through the through hole from the lower part of the upper cover; the filter is characterized in that threads are arranged on the outer portion of the upper end of the main filter tank body, inner threads matched with the threads of the main filter tank body are arranged on the upper cover, and a cylindrical pushing portion extends out of the lower portion of the upper cover below the through hole of the upper cover.
Furthermore, the piston rod penetrates through the piston part and extends downwards, and a liquid outlet is formed in the side wall of the lower end of the piston rod.
Furthermore, an annular pushing part extends downwards from the lower part of the piston part. Furthermore, the prefiltration part is of a hard sheet structure, and the structure of the prefiltration part is a porous structure or is provided with a micropore matrix.
The rigid pre-filter element allows better compression and stabilization of the underlying filter layer.
Furthermore, a concave pit or an annular bulge is arranged at the contact part of the prefiltering part and the front end of the screw rod of the adjustable part.
The adjustable member is positioned to ensure that its force on the pre-filter member remains centered.
Further, the bottom filter comprises a hard bracket and a filter membrane fixed on the bracket.
In the prior art, the filtering membrane is directly placed at the bottom of the main body tank of the filter, so that the operation is inconvenient during installation.
Further, the bottom filter comprises an upper fixing frame, a filtering membrane and a lower bracket from top to bottom.
Drawings
FIGS. 1 and 2 are schematic views of one embodiment of the multi-functional pin filter of the present invention for sample pretreatment;
fig. 3 and 4 are schematic diagrams of two other embodiments of the multi-functional pin filter for sample pretreatment according to the present invention.
Names of components represented by respective reference numerals in the drawings:
the filter comprises a filter main body groove 1, a needle tube connecting part 11, an upper cover 2, a through hole 21, a cylindrical pushing part 22, an adjustable part 3, a liquid inlet 31, a liquid outlet 32, a piston part 33, a pushing part 34, a pre-filtering part 4, a filtering layer 5, a bottom filtering part 6, an upper fixing frame 63, a filtering membrane 61 and a lower fixing frame 62.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 and 2, the present invention provides a multi-functional needle filter for sample pretreatment, comprising:
the filter comprises a filter main body groove 1, a filter cover and a filter cover, wherein the filter main body groove is provided with a cylindrical groove body with a hollow cavity, and the lower end of the filter main body groove is provided with a needle tube connecting part 11;
the upper cover 2 is connected with the upper end of the filter main body groove 1 and is provided with a through hole 21;
the adjustable component 3 is in threaded connection with the through hole 21 on the upper cover, and the lower part of the adjustable component extends into the filter main body groove 1;
a pre-filtering component 4 which is arranged in the filter main body groove 1 and is positioned below the adjustable component 2;
a filter layer 5 which is arranged in the filter main body groove 1 and is positioned below the pre-filtering component 4;
and a bottom filter member 6 disposed in the filter body tank 1 and below the filter layer 5.
Set up adjustable part and prefiltering part for can install different filter layers according to the experiment needs of difference in the filter main part groove of same specification, the filter layer of different thickness can promote prefiltering part through adjustable part and realize suppression and stability to the filter layer, has consequently realized the multipurpose in filter main part groove, need not to customize different needle filter to the experiment of difference, great saving cost, latency, the efficiency of the research of promotion.
In the preferred embodiment shown in the figure, the adjustable component 2 is a hollow pipeline structure, the upper end of the adjustable component is provided with a liquid inlet 31, and the side wall of the front end (lower end) of the screw rod is provided with a liquid outlet 32.
Besides the liquid inlet (liquid inlet pipe) which is arranged on the upper cover 2 as in the prior art, the invention also creatively integrates the liquid inlet pipe and the adjustable component into a whole and further optimizes the structure.
In some embodiments, the pre-filter member 4 is a rigid sheet structure, which is a porous structure or provided with a matrix of micropores. The material can be PE polyethylene, nylon or PTFE polytetrafluoroethylene filter membrane.
The rigid pre-filter element allows better compression and stabilization of the underlying filter layer.
In some embodiments, the contact part of the pre-filtering component 4 and the front end (lower end) of the screw of the adjustable component 3 is provided with a pit or an annular bulge.
It is convenient to position the adjustable element 3 in such a way that its force on the pre-filter element 4 remains centred.
The filter layer 5 is generally selected from one or more combinations of silica gel and its chemical modifications, polystyrene polymer and its chemical modifications, magnesium silicate, alumina, activated carbon, polyamide, graphitized carbon, sulfate, etc., according to different experimental requirements.
In some embodiments, the bottom filter 6 comprises a rigid support and a filter membrane secured to the support.
In the prior art, the filtering membrane is directly placed at the bottom of the main body tank of the filter, so that the operation is inconvenient during installation.
In some embodiments, the bottom filter 6 comprises, from top to bottom, an upper mount 63, a filter membrane 61 and a lower mount 62.
As shown in fig. 3, in some embodiments, the adjustable component 3 is a piston assembly, the piston assembly includes a piston rod and a piston portion 33, the piston rod penetrates through the piston portion 33 and has a hollow pipeline structure, the piston portion 33 is in sealed sliding fit with the inner cavity of the filter main groove body, and the piston rod passes through the through hole 21 from the lower part of the upper cover 2; the filter is characterized in that threads are arranged on the outer portion of the upper end of the filter main tank body 1, inner threads matched with the threads of the filter main tank body 1 are arranged on the upper cover 2, and a cylindrical pushing portion 22 extends out of the lower portion of the upper cover below a through hole 21 of the upper cover 2.
In the example of fig. 3, the piston rod extends downward through the piston portion 33, and a liquid outlet 32 is opened in a side wall of a lower end of the piston rod.
The upper cover is screwed with the thread of the filter main body groove, the upper cover is rotated, the cylindrical pushing part of the upper cover pushes the piston part 33 downwards to move downwards along the cavity pipeline in the filter main body groove, the piston part is provided with an annular sealing ring, so that the piston part is connected with the cavity pipeline in the filter main body groove in a sealing and sliding manner, and the lower end of the piston rod presses the pre-filtering component 4.
In other embodiments, as shown in fig. 4, an annular pushing portion 34 extends downward from the lower portion of the piston portion 33. In this embodiment, the annular pushing portion 34 is used to press the pre-filter element 4, so that the force applied to the pre-filter element 4 is more uniformly balanced.
Two specific protocols for using the multi-functional pin filter of the present invention are shown below.
Example 1 analysis of the residual amounts of 331 pesticides and their metabolites in spinach and green vegetables:
weighing 10g of sample into a 50mL centrifuge tube, adding 10mL of acetonitrile, 4g of anhydrous magnesium sulfate, 1g of sodium chloride, 1g of sodium citrate, 0.5g of disodium hydrogen citrate and 1 ceramic proton, covering a centrifuge tube cover, violently shaking for 1min, and then centrifuging for 5min at 4200 r/min. 1mL of the supernatant was aspirated by a syringe and passed through a multifunction needle filter of the present invention (containing 50mg of anhydrous magnesium sulfate, 25mg of PSA, and 2.5mg of GCB), and the filtered solution was directly subjected to liquid chromatography-mass spectrometry.
Example 2, analysis of the residual amounts of 331 pesticides and their metabolites in tea:
weighing 2g of sample in a 50mL centrifuge tube, adding 10mL of water, mixing evenly in a vortex mode, and standing for 30 min. 15mL of acetonitrile-acetic acid solution (4.2.1), 6g of anhydrous magnesium sulfate, 1.5g of sodium acetate and 1 ceramic proton are added, a centrifugal tube cover is covered, and the mixture is centrifuged for 5min at 4200r/min after being vigorously shaken for 1 min. 1mL of the supernatant was aspirated by a syringe and passed through a multifunction needle filter of the present invention (containing 50mg of anhydrous magnesium sulfate, 50mg of C18, 50mg of PSA, and 25mg of GCB), and the filtered solution was directly subjected to liquid chromatography-mass spectrometry.
Example 3 analysis of residual amount of 11 plant growth regulators in bean sprouts:
weighing 10g of sample in a 50mL centrifuge tube, adding 20mL of acetonitrile solution containing 1% formic acid, homogenizing at high speed for 2min, adding 6g of anhydrous magnesium sulfate, 1.5g of sodium acetate and 1 ceramic proton, covering a centrifuge tube cover, immediately vortex and mixing for 1min, and centrifuging for 5min at 10000 r/min. 1mL of the supernatant was aspirated by a syringe and passed through a multifunction needle filter (containing 50mg of anhydrous magnesium sulfate and 25mg of C18) of the present invention, and the filtered solution was directly subjected to liquid chromatography-mass spectrometry.
Example 4 analysis of the residual amount of fipronil and its metabolites in chicken:
weighing 5g of fully homogenized sample in a 50mL centrifuge tube, adding 5mL of water, carrying out vortex mixing for 30s, adding 25mL of acetonitrile, mixing, carrying out ultrasonic extraction for 5min, then adding 4g of anhydrous Na2SO4 and 1g of NaCl, carrying out vortex mixing for 1min, and carrying out centrifugation for 5min at 10000r/min at 4 ℃. 1mL of the supernatant was aspirated by a syringe and passed through a multifunction pin filter of the present invention (containing 50mg of anhydrous sodium sulfate, 25mg of HLB-A, 10mg of C18, and 25mg of PSA), and the filtered solution was directly subjected to liquid chromatography-mass spectrometry.
In the embodiment, the multifunctional needle filter can adjust the amount of the filled adsorbent through the screw to adapt to different application requirements, the steps of performing vortex purification in the purification tube and then centrifuging to obtain supernatant and then passing through the needle filter are not needed according to the traditional steps, the liquid flowing out of the multifunctional needle filter can be directly subjected to sample injection analysis, and the processing time is shortened.
Some preferred examples of the invention and specific implementations thereof are given herein. Those of ordinary skill in the art may implement similar functionality and/or achieve similar results in other implementations based on the present teachings. All such equivalent embodiments are within the scope of the present invention and are intended to be covered by the claims of the present invention.

Claims (9)

1. A multi-functional needle filter for sample pretreatment, characterized by, includes:
the filter body groove is provided with a cylindrical groove body with a hollow cavity, and the lower end of the filter body groove is provided with a needle tube connecting part;
the upper cover is connected with the upper end of the filter main body groove and is provided with a through hole;
the adjustable component is in adaptive connection with the through hole on the upper cover, the lower part of the adjustable component extends into the filter main body groove, and the upper cover pushes the adjustable component to move along the filter main body groove so as to push the pre-filtering component to slide in the filter main body groove;
the pre-filtering component is arranged in the filter main body groove and is positioned below the adjustable component;
the filter layer is arranged in the filter main body groove and is positioned below the pre-filtering component;
and the bottom filtering component is arranged in the filter main body groove and is positioned below the filtering layer.
2. The multifunctional needle type filter for sample pretreatment according to claim 1, wherein the adjustable component is a screw rod and has a hollow pipeline structure, a liquid outlet is formed in a side wall of a front end of the screw rod, and the through hole is provided with an internal thread matched with a thread of the screw rod.
3. The multifunctional needle type filter for sample pretreatment according to claim 1, wherein the adjustable component is a piston assembly, the piston assembly comprises a piston rod and a piston part, the piston rod penetrates through the piston part and has a hollow pipeline structure, the piston part is in sealing sliding fit with an inner cavity of a filter main groove body, and the piston rod penetrates through a through hole from the lower part of the upper cover; the filter is characterized in that threads are arranged on the outer portion of the upper end of the main filter tank body, inner threads matched with the threads of the main filter tank body are arranged on the upper cover, and a cylindrical pushing portion extends out of the lower portion of the upper cover below the through hole of the upper cover.
4. The multifunctional needle type filter for sample pretreatment according to claim 3, wherein the piston rod extends downwards through the piston part, and a liquid outlet is formed in a side wall of the lower end of the piston rod.
5. The multi-functional needle type filter for sample pretreatment of claim 3, wherein the lower portion of the piston portion extends downward to form an annular pushing portion.
6. A multifunctional pin filter for sample pretreatment according to any one of claims 2 to 4, wherein the prefiltering part is a hard sheet structure, and the structure is a porous structure or is provided with a micropore matrix.
7. The multifunctional needle type filter for sample pretreatment according to claim 5, wherein the contact part of the prefiltering part and the screw front end of the adjustable part is provided with a pit or an annular bulge.
8. The multi-functional needle type filter for sample pretreatment of claim 6, wherein the bottom filter comprises a rigid bracket and a filter membrane fixed on the bracket.
9. The multifunctional needle type filter for sample pretreatment according to claim 7, wherein the bottom filter comprises an upper fixing frame, a filtering membrane and a lower fixing frame from top to bottom.
CN202111157173.0A 2021-09-30 2021-09-30 Multifunctional needle type filter for sample pretreatment Pending CN113813663A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111157173.0A CN113813663A (en) 2021-09-30 2021-09-30 Multifunctional needle type filter for sample pretreatment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111157173.0A CN113813663A (en) 2021-09-30 2021-09-30 Multifunctional needle type filter for sample pretreatment

Publications (1)

Publication Number Publication Date
CN113813663A true CN113813663A (en) 2021-12-21

Family

ID=78916107

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111157173.0A Pending CN113813663A (en) 2021-09-30 2021-09-30 Multifunctional needle type filter for sample pretreatment

Country Status (1)

Country Link
CN (1) CN113813663A (en)

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