EP4093537A1 - Durchlasskontrollelement sowie verfahren zu dessen betreiben - Google Patents
Durchlasskontrollelement sowie verfahren zu dessen betreibenInfo
- Publication number
- EP4093537A1 EP4093537A1 EP21702600.4A EP21702600A EP4093537A1 EP 4093537 A1 EP4093537 A1 EP 4093537A1 EP 21702600 A EP21702600 A EP 21702600A EP 4093537 A1 EP4093537 A1 EP 4093537A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- alkyl
- variables
- stimulus
- particularly preferably
- aryl
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/0052—Preparation of gels
Definitions
- the present invention relates to a passage control element containing particles composed of a stimulus-responsive hydrogel.
- the stimulus-responsive hydrogel is sensitive to a certain stimulus molecule and experiences a change in the volume phase transition temperature of at least 5 K when the stimulus is triggered by reacting with an equimolar amount of the stimulus molecule.
- the passage control element is therefore self-sufficient.
- the present invention thus relates to a flow control element, comprising at least one flow for a fluid as well as particles attached within the flow containing at least one or formed from at least one stimulus-responsive hydrogel, containing or consisting of the following repeat units: at least one first, not cross-linking structural unit (I) at least one cross-linking structural unit (II) at least one structural unit (III) which contains a functionality responsive to a stimulus molecule, the stimulus-responsive hydrogel undergoing a change in the volume phase transition temperature of at least 5 K when the stimulus is triggered by reacting with an amount of the stimulus molecule that is equimolar to the amount of the structural unit (III) .
- the present invention uses particles made of a doubly responsive, analyte-sensitive hydrogel as an autarkic switching passage control element.
- the particles are made up of a crosslinked polymer that exhibits a volume phase transition of the LCST type (LCST from lower critical solution temperature) in aqueous media. Below the phase transition the hydrogel has swollen, above it displaces water and has collapsed. Furthermore, the material carries recognition groups for the molecule serving as the triggering stimulus. If the recognition groups are relatively hydrophobic and the stimulus molecules are relatively hydrophilic, the volume phase transition shifts to higher temperatures due to the specific binding of the stimulus molecules to the recognition groups.
- the reverse constellation is also possible in principle.
- the most important advantage is the ability to stop a flow of liquid when it contains a specific target chemical compound without the need for an energy supply and external measuring and control elements.
- Ri and R2 -H, -alkyl, preferably -H and -CH3, particularly preferably -H
- R3 and R5 -H, -alkyl, alkenyl, alkynyl, aryl, preferably -H and -CH3, particularly preferably -H,
- Ri and R2 -H, -alkyl, preferably -H and -CH3, particularly preferably -H,
- R3 and R5 -H, -alkyl, alkenyl, alkynyl, aryl, preferably -H and -CH3, particularly preferably -H,
- Ri and R3 -H, -alkyl, alkenyl, alkynyl, aryl, preferably -H and -CH3, particularly preferably -H,
- Ri and R2 -H, -alkyl, preferably -H and -CH3, particularly preferably -H,
- the molar ratio m: n is from 100: 0 to 0: 100, preferably 95: 5 to 5: 95, more preferably from 90:10 to 10:90, is particularly preferably from 80:20 to 20:80, with the proviso that there is a difference in the variables of the respective pair in at least one of the pairs of variables R1 / R2, R3 / R5, R4 / R6; g) polymeric units of the general structure where the molar ratio m: n is from 100: 0 to 0: 100, preferably 95: 5 to 5:95, more preferably from 90:10 to 10:90, particularly preferably from 80:20 to 20:80, the Variables Ri, R2, R3, R4, Rs R 6 , n, m, x and y are the same or different on each occurrence and each have the following meaning:
- Ri and R2 -H, -alkyl, preferably -H and -CH3, particularly preferably -H,
- R3 and R5 -H, -alkyl, alkenyl, alkynyl, aryl, preferably -H and -CH3, particularly preferably -H,
- Ri and R2 -H, -alkyl, alkenyl, alkynyl, aryl, the molar ratio m: n from 100: 0 to 0: 100, preferably 95: 5 to 5:95, particularly preferably from 90:10 to 10: Is 90, with the proviso that Ri * R2; i) polymeric units of the general structure or copolymers of the three units in any composition, where the variables Ri, R 2 , R 3 , x are the same or different on each occurrence and each have the following meanings:
- Ri and R3 -H, -alkyl, alkenyl, alkynyl, aryl, preferably -H and -CH 3,
- Ri and R2 -H, -alkyl, alkenyl, alkynyl, aryl, preferably -H and -CH3, where Ri is preferably isopropyl and R2 is ethyl, the molar ratio m: n from 100: 0 to 0: 100, preferably 85 : 15 to 15:85, particularly preferably from 70:30 to 30:70, with the proviso that Ri * R2; m) Polyphosphoric esters of the general structure where the variables Ri, R2, n, m and o are the same or different at each occurrence and each have the following meaning:
- Ri and R2 -H, -alkyl, alkenyl, alkynyl, aryl, preferably -H and -CH 3, where Ri is preferably isopropyl and R2 is ethyl, the molar proportion of the repeating units indicated by m, n and o being from 2 to 98, preferably 10 to 90, particularly preferably from 20 to 80 n from 98 to 2, preferably 90 to 10, particularly preferably from 80 to 20 o from 1 to 70, preferably 2 to 50, particularly preferably from 5 to 20, with the proviso that Ri * R2; n) polymeric units of the general structure where the variables Ri, R2, n and m are the same or different at each occurrence and each have the following meaning:
- Ri to R 6 -H, -alkyl, alkenyl, alkynyl, aryl, -alkyloyl, where preferably at least two of the radicals Ri to R 6 are H, where n means that the unit is in the form of a polymer; p) units derived from starch, dextran, pullulan, inulin, lichenin, chitosan, arabinogalactan, guaran, carageenan and agarose; q) units with elastin-like structural elements; r) Polymers, as in Adv. Polym. Be. 242, 29-89 (2011); and r) polymeric units comprising or consisting of at least two of the aforementioned units; wherein the aforementioned structures are random, alternating or block copolymers.
- the at least one structural unit (III) responsive to a stimulus molecule has at least one functional unit selected from the group consisting of cyclic boronic acid monoesters, vicinal cis-1,2-diols, preferably carbohydrates such as fructose, glucose and / or Mannose, organic molecules with vicinal cis-1,2-hydroxyl groups, preferably ascorbic acid, gallic acid, L-dopa and / or alizarin red S and esters or amides derived therefrom, antibodies such as, for example, a covalently bound antibody against K99-R ⁇ M from E. coli or antibody fragments, aptamers, DNA, RNA, PNA, complexing agents such as. B.
- cyclic boronic acid monoesters vicinal cis-1,2-diols
- carbohydrates such as fructose, glucose and / or Mannose
- organic molecules with vicinal cis-1,2-hydroxyl groups preferably ascorbic acid, gallic acid, L-do
- the at least one crosslinking structural unit (II) is selected from the group consisting of a) in which
- R 1 H or alkyl; preferably H, CH3,
- R ' is hydrogen, a linear or branched alkyl radical having 1 to 16 carbon atoms, preferably 2 carbon atoms, or a linear or branched hydroxylalkylene radical having 1 to 16 carbon atoms, preferably 1 carbon atom, and
- R is selected from the group consisting of the following structural units where n is the same or different on each occurrence and is 0 or 1 to 500, R 1 is hydrogen or methyl, and X is O or NH; or in which
- R has the meaning given above or is hydrogen, with the proviso that at least 2 radicals R have the meaning given above, and
- R ' is hydrogen, a linear or branched alkyl radical having 1 to 16 carbon atoms, preferably 2 carbon atoms, or a linear or branched hydroxylalkylene radical having 1 to 16 carbon atoms, preferably 1 carbon atom, and
- R has the meaning given above or is hydrogen, with the proviso that at least 2 radicals R have the meaning given above, and
- Ri is selected from the group consisting of H, alkyl, aryl, preferably CH3, and
- Z has the same meaning as defined under a); f) is selected from the group consisting of the following
- R 2 is hydrogen, a linear or branched alkyl radical with 1 to 8 carbon atoms, preferably methyl, where R 1 and R 2 are identical or different on each occurrence, m is an integer from 2 to 6, preferably 2 or 3, n 1 to 500, preferably 1 to 8 or 1 to 25, preferably 1 to 5, and z is 0 or 1, or Z has the following meaning ii) Cycloaliphatic system according to the following structural units or iii) in which
- A is selected from the group consisting of the following
- R ' has the meaning given under d), preferably
- Is ethyl and R has the following meaning where m is the same or different on each occurrence and is 0 or 1 to 500; and h) crosslinking through mono- and disaccharides.
- the embodiment of the crosslinking structural unit provided in the aforementioned embodiment according to feature a) is particularly suitable if the non-crosslinking structural unit is the one under embodiments a), b), c), d), f) and / or g) according to the above statements made on the non-crosslinking structural units (I) come into question.
- the at least one repetition unit (III) responsive to a stimulus molecule is as defined below in which
- R 1 is selected from the group consisting of alkyl radicals having 1 to 8 carbon atoms and hydrogen, and
- R 5 is selected from the group consisting of the following groupings in which
- Y is a spacer functionality selected from the group consisting of the following functionalities n is 0 or 1, and x is an integer from 1 to 12, preferably 2 to 4, is 2, or a covalently bound antibody against K99-R ⁇ M from E. coli or other covalently bound antibodies directed against biochemically relevant peptides or proteins or a covalently bound lectin.
- the at least one non-crosslinking structural unit (I) in an amount of 50.0 to 98.0 mol%, preferably 75.0 to 90.0 mol%, particularly preferably 80.0 to 84.0 mol%, the at least one crosslinking structural unit (II) in an amount of 1.0 to 25.0 mol%, preferably 4.0 to 10.0 mol%, particularly preferred 6.5 to 7.0 mol%, and / or the at least one structure unit (III) responsive to a stimulus molecule in an amount of 1.0 to 25.0 mol%, preferably 6.0 to 15.0 mol%, particularly preferably 9.5 to 11.0 mol%, or the stimulus-responsive polymer is formed from these repeating units.
- the particles present in the passage control element preferably have a number-average particle size of 5 ⁇ m to 500 ⁇ m
- the particles are porous.
- the swelling speed of hydrogels is rather low, so that the switching speed of passage control elements with hydrogels as the active material, without special measures, remains significantly behind that of an externally mechanically switched valve.
- One challenge for a practical application is to design the hydrogel in the self-sufficient flow control element in such a way that it can close quickly and completely without restricting the flow too much in the open state.
- the passage control element according to the invention has two additional features. By introducing porogens in the production of the hydrogel, a porous material is produced which has a higher surface-to-volume ratio than a monolithic gel. Furthermore, individual hydrogel particles in a preferred size range in the collapsed state from 5 ⁇ m to 500 ⁇ m are used to produce the active element.
- the particles When the particles are packed, cavities with an average volume of approx. 50 pm 3 to approx. 50,000,000 pm 3 remain, through which a relatively unhindered flow is possible. At the same time, the relatively small size of the hydrogel particles also helps to obtain a surface-to-volume ratio that is favorable for rapid swelling. Polydisperse particles are particularly preferred.
- the particles are largely spherical, have a normally distributed size distribution with an average particle size of 200 to 800 miti, preferably 400 to 500 miti, the standard deviation of the sizes being 100 miti.
- the particles are held in a fixed position, preferably in a space compartment which is stored on both sides with a boundary (2, 3) that is permeable to the fluid and impermeable to the particles (4, 5).
- the boundary is preferably selected from the group consisting of nonwovens, membranes, perforated plates, grids and / or sieves.
- the particles have an aspect ratio of> 0.7, preferably> 0.8, more preferably> 0.9, particularly preferably 0.9 to 1.0. This facilitates the packing of the particles in the space compartment.
- the present invention relates to a method for closing the flow (1) through a flow control element according to the invention, in which the stimulus-responsive hydrogel located in a stimulus molecule-free fluid or the particles located in a stimulus molecule-free fluid are contacted with a fluid containing stimulus molecules .
- the invention also relates to a method for opening a method for closing the closed flow element according to the method described above, in which the stimulus-responsive hydrogel in a fluid containing stimulus molecules or the particles in a stimulus molecule-containing fluid with a stimulus molecule-free Fluid are contacted.
- the activated hydrogel or the particles are contacted with a fluid that does not contain any stimulus molecules.
- the at least one functional unit of the stimulus molecule responsive repeat unit (III) and the stimulus molecule are selected from the group consisting of the following pairings: functional unit: cyclic boronic acid monoester and stimulus molecule: vicinal cis-l , 2-diol, preferably carbohydrates such as fructose, glucose and / or mannose, and / or organic acids with vicinal cis-1,2-hydroxyl groups, preferably ascorbic acid, gallic acid, L-dopa and / or alizarin red S and esters derived therefrom or Amides; functional unit: vicinal cis-1,2-diols, preferably carbohydrates such as fructose, glucose and / or mannose and / or organic acids with vicinal cis-1,2-hydroxyl groups, preferably ascorbic acid, gallic acid, L-dopa and / or alizarin red S as well as esters or amides derived therefrom, and
- Stimulus molecule Concanavalin A or another lectin
- the present invention relates to a method for controlling the flow of a fluid by means of a control element according to the invention, in which stimulus molecules are introduced into a flow of a stimulus molecule-free fluid flowing through the passage control element, whereby the volume of the particles is increased and the flow is blocked, or a stimulus molecule -free fluid is brought into contact with the particles in the state of volume increase due to the binding of stimulus molecules, as a result of which the particles release stimulus molecules in equilibrium, so that the volume of the particles is reduced and the flow is released.
- the present invention also relates to possible uses of the passage control element in bioassays, in lab-on-a-chip systems, in separating membranes and in conduit systems.
- the present invention is described in more detail with reference to the following execution forms, but without restricting the invention thereto.
- Microscopic images of particle samples are recorded in transmitted light with a Leica Leitz DM RB microscope (or with another suitable light microscope) with a magnification of 100x.
- dispersions with concentrations in the range from approx. 5 gl 1 to approx. 15 gl 1 are used. If necessary, more concentrated dispersions are diluted.
- the images are processed for evaluation using the ImageJ 1.52n software.
- the particles are then counted with the same software and the area of each counted particle is determined. The procedure is largely in accordance with the description in (https://imagej.nih.gov/ij/docs/pdfs/examples.pdf, p. 2 Particle Counting and Analysis).
- the data generated by ImageJ are loaded into the OriginPro 9.1 software in order to carry out a statistical evaluation and to visualize the particle size distributions.
- the particle sizes determined from the microscope images were divided into size categories, and the number of particles per category was then plotted as a bar chart.
- the output is an image with a representation of the outlines of all particles recorded by the software and a list in which each particle number is assigned a particle area in pm 2 .
- the particles are divided into size categories using Origin's statistical functions and the results are plotted on bar graphs.
- FIG. 1 shows the development of the degree of swelling of hydrogel parti no NM021 over time in pure water and in an aqueous solution of alizarin red S (concentration 4.0 mmol-l 1 ).
- Gallic acid and its esters L-Dopa, generally molecules with the catechol structural motif; Ascorbic acid, fructose, general structures with vicinal cis-1,2-diols.
- the amount of the difference between the cloud points of aqueous solutions of the soluble polymer analogous to the hydrogel without crosslinking groups (concentration of 3.0 gl 1 ) with and without stimulus (stimulus concentration equimolar to the amount of recognition groups in the polymer solution) should be at least 5 ° C be.
- FIG. 2 shows the simulated permeabilities as a function of the mean particle size.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Preparation (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020200643.1A DE102020200643A1 (de) | 2020-01-21 | 2020-01-21 | Durchlasskontrollelement sowie verfahren zu dessen betreiben |
| PCT/EP2021/051328 WO2021148532A1 (de) | 2020-01-21 | 2021-01-21 | Durchlasskontrollelement sowie verfahren zu dessen betreiben |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4093537A1 true EP4093537A1 (de) | 2022-11-30 |
Family
ID=74494869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21702600.4A Withdrawn EP4093537A1 (de) | 2020-01-21 | 2021-01-21 | Durchlasskontrollelement sowie verfahren zu dessen betreiben |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4093537A1 (de) |
| DE (1) | DE102020200643A1 (de) |
| WO (1) | WO2021148532A1 (de) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006025095B4 (de) | 2006-05-24 | 2017-07-13 | Technische Universität Dresden | Hydrogelbasierte Einrichtung |
| JP2008039541A (ja) | 2006-08-04 | 2008-02-21 | National Institute For Materials Science | マイクロ流路チップ及びそれを用いた生体高分子の処理方法 |
| EP2745936B1 (de) | 2012-12-21 | 2017-03-15 | Fraunhofer Gesellschaft zur Förderung der angewandten Forschung E.V. | Fluidiksystem mit saugfähigem Material und schaltbarem Polymergel |
| DE102014200135A1 (de) * | 2014-01-08 | 2015-07-09 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Responsives Hydrogel für den Nachweis von Biomolekülen |
| CA2855648A1 (en) * | 2014-07-03 | 2016-01-03 | The Governors Of The University Of Alberta | Stimulus responsive polymeric system |
| US9759648B2 (en) * | 2014-07-03 | 2017-09-12 | The Governors Of The University Of Alberta | Stimulus responsive polymeric system |
| JP6843420B2 (ja) * | 2016-08-22 | 2021-03-17 | 国立大学法人東京工業大学 | 微粒子分離デバイスおよび微粒子の分離方法 |
| GB201800698D0 (en) * | 2018-01-16 | 2018-02-28 | Intray Ltd | Time temperature indicator label |
| DE102017222072B4 (de) | 2017-12-06 | 2022-05-25 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Artikel, der ein Hydrogel mit antioxidativer Wirkung enthält |
-
2020
- 2020-01-21 DE DE102020200643.1A patent/DE102020200643A1/de not_active Ceased
-
2021
- 2021-01-21 WO PCT/EP2021/051328 patent/WO2021148532A1/de not_active Ceased
- 2021-01-21 EP EP21702600.4A patent/EP4093537A1/de not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DE102020200643A1 (de) | 2021-07-22 |
| WO2021148532A1 (de) | 2021-07-29 |
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