EP3183575A1 - Testgerät zur untersuchung eines nahrungsmittels auf einen analyten und dafür vorgesehene teststreifen - Google Patents
Testgerät zur untersuchung eines nahrungsmittels auf einen analyten und dafür vorgesehene teststreifenInfo
- Publication number
- EP3183575A1 EP3183575A1 EP14757893.4A EP14757893A EP3183575A1 EP 3183575 A1 EP3183575 A1 EP 3183575A1 EP 14757893 A EP14757893 A EP 14757893A EP 3183575 A1 EP3183575 A1 EP 3183575A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sample
- test device
- analyte
- cap
- test
- 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- Withdrawn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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/54366—Apparatus specially adapted for solid-phase testing
- G01N33/54386—Analytical elements
- G01N33/54387—Immunochromatographic test strips
- G01N33/54388—Immunochromatographic test strips based on lateral flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/54366—Apparatus specially adapted for solid-phase testing
- G01N33/54386—Analytical elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/558—Immunoassay; Biospecific binding assay; Materials therefor using diffusion or migration of antigen or antibody
Definitions
- Test device for testing a food for an analyte
- the present invention relates to a test device for testing a food for an analyte and a test strip for such a test device.
- the analytes of interest in the context of the present application which trigger allergic reactions or allergy-like symptoms, are contained in the same foods in very different concentrations due to the different storage, aging and production of the food in question. Affected individuals can therefore avoid the onset of these symptoms only through a radical avoidance strategy that avoids the consumption of all foods containing potentially harmful substances.
- US 2010/0317033 A1 describes in this context a lateral-flow test for the detection of allergens in food, wherein a liquid sample of the food saliva of the tester is added to check whether the allergen in the food binds an antibody present in the saliva.
- WO 2009/048895 A2 describes a portable device for detecting possible allergens in a sample.
- the device comprises a housing in which an allergen detection chip can be placed, on which an antibody against the potential allergen is provided, which is provided with a detectable marker.
- the sample Via an input port, the sample is introduced into the housing, wherein the detection is carried out in the manner of an immunoassay.
- an immunoassay for this purpose, for example, be used with a particulate tracer conjugated antibodies against the allergens.
- EP 1 767 938 B1 describes a detection method for histamine in foods in which histamine is first extracted from a sample of the food and then detected via a color change.
- the company Immundiagnostik 64652 Bensheim, offers a histamine ELISA kit for the determination of histamine in EDTA plasma and urine.
- the test is based on the method of the competitive enzyme immunoassay.
- the derivatized sample is incubated together with a peroxidase-labeled polyclonal histamine antibody.
- the target antigen in the sample competes with the histamine derivative bound to the plate for binding of the polyclonal antibodies.
- the concentration of the antibody bound to the histamine derivative is therefore inversely proportional to the concentration of the target antigen in the sample.
- His- taure TM histamine test
- the test is for detection of histamine in samples of foodstuffs, wherein during the preparation of the samples the histamine is derivatized by an acylating reagent in N-acylhistamine. Subsequently, a competitive ELISA test is performed using a microtiter plate.
- the company Labordiagnostika North also offers a rapid test, with the use of a lateral-flow cassette histamine can be detected in fish.
- 10 g of the fish sample are removed, mixed with 240 ml of distilled water and homogenized. Thereafter, the homogenate is filtered, then 100 .mu.l of the filtered homogenate are placed in a tube with acylation buffer, after which the tube is shaken and incubated for five minutes at room temperature. Thereafter, 100 ⁇ of the thus prepared sample are mixed with a running buffer and shaken again. Subsequently, 100 .mu. ⁇ of the sample mixed with the running buffer are added to the lateral-flow cassette and incubated for five minutes at room temperature, whereupon the test result can then be evaluated by means of a formation of colored lines in a detection zone and a control zone.
- the test indicates whether histamine is present in a concentration above or below a threshold of 50 ppm in the sample.
- antibodies For the detection on the lateral-flow-carrier labeled with gold particles antibodies are used, which bind to solid phase histamine. The amount of bound labeled antibodies is inversely proportional to the histamine concentration in the sample.
- This test is a competitive assay in which histamine bound to the support competes with the derivatized histamine from the sample for binding to the antibody labeled with gold particles.
- Test strips and cassettes which in the manner of a lateral flow assay in an immunological reaction indicate an analyte by an optically visible color reaction, are also widely known in the art.
- EP 0 291 194 B1 describes competitive immunoassays and sandwich assays for detecting the pregnancy hormone in urine.
- the described test strips have a deposition zone to which the liquid sample is applied. Downstream of the application zone, a first zone is provided on which, in the dry state, an antibody to the pregnancy hormone labeled with gold particles is stored.
- the Gold-antibody complex resolubilizes and migrates with the liquid sample through a detection zone into a control zone. Downstream of the control zone may still be provided a suction zone to receive excess liquid.
- an antibody is immobilized, which binds to the pregnancy hormone in the manner of a sandwich reaction, to which in turn the gold-labeled antibody complex is bound.
- gold particles in the detection zone are concentrated when pregnancy hormone is present in the discontinued sample.
- the concentrated gold particles in the detection zone lead to an optically detectable colored line.
- the gold-labeled antibodies which are not bound in the detection zone migrate further into the control zone, where antibodies directed against the gold-labeled antibodies are immobilized. In this way, the gold-labeled antibodies (also) are concentrated in the control zone, which also leads there to an optically detectable colored line.
- a colored line in the control zone indicates that the assay has worked in principle, with a colored line in the detection zone indicating that pregnancy hormone was present in the sample.
- EP 291 194 B1 and the WO 2012/069610 A1 deal in detail with the structure of the test strips, the suitable materials, the immobilization of the antibodies in the detection zone and the control zone, the dry storage of the labeled antibodies in the first Zone, the way in which the resolubilization of the dry, gold-labeled antibodies can be done etc.
- structure, function and interpretation of lateral-flow tests and the corresponding test strips is based on this state of the art and on there referenced prior art.
- the structure and function of lateral flow assays is now part of the prior art, so that a detailed description in the present application is not required.
- antibodies against analytes of interest in the context of the present application are widely available on the market, so that the specific generation of antibodies is also assumed to be known in the context of the present application as known in the art.
- the unmodified analytes often lack sufficient immunogenic properties, so that it is difficult to generate specific antibodies against the unmodified analytes, which is why the analytes are modified before the generation of the antibodies.
- An example of this is described in Wolthers et al .: "Evaluation of urinary metanephrines and normetanephrine enzyme immunoassay (ELISA) kits by comparison with isotope dilution mass spectrometry", in Clinical Chemistry 1997, 43: 1, pages 14-155.
- the present invention seeks to provide a test device of the type mentioned above, which is simple and with a quick and easy to be performed test procedure is possible, even the non-professional users in the restaurant or at Can use everyday shopping.
- a test device for examining a foodstuff for an analyte having a receiving space for a sample of the foodstuffs to be examined, a reservoir containing a running buffer, the tester for comminuting and mixing the foodstuffs received in the receiving space Sample is set up with the running buffer, and with a receptacle for a test strip, on the manner of a lateral-flow-assays, an optically detectable signal is generated, which indicates whether the analyte is detectable in the sample, wherein the test device is set up to dispense the comminuted and mixed with the running buffer, liquid sample on the test strip.
- a test strip provided for the test device comprises a porous support on which in a first zone a labeled binding reagent that is specific for the analyte and an immobilized binding agent are arranged in a detection zone such that the liquid sample applied to the porous support contains the picks up labeled binding reagent and moves downstream therewith to the detection zone where an optically detectable signal is generated indicating whether the analyte is detectable in the sample.
- the test device can be a cheap disposable product or a reusable and once-usable components containing product that can be carried in the pocket or handbag due to its small dimensions similar to a pregnancy test or a pen.
- the grinding and mixing of the sample can be carried out by twisting two parts of the test apparatus relative to one another, as is the case with a pepper or salt mill or also with a ballpoint pen, in which the mine is turned by rotating the upper section. and is extended.
- test device longitudinally displaceable against each other, so that by compressing the test device in one of its axes, the corresponding crushing and mixing of the sample takes place.
- the sample can be applied to the test strip by further manipulation of the test device. This manipulation can be that an opening connecting the receptacle with the test strip is released, for example, by twisting or displacing two parts of the test device, pulling a film from the opening, or pulling a closure plug out of this opening.
- the liquid sample can then reach the test strip, where it leads in the manner of a lateral-flow-assays to a colored line indicating the result of the test carried out.
- a successful test can be that a colored line is displayed when the analyte is contained in the sample.
- the immunological reaction then proceeds e.g. in the manner of a sandwich assay.
- the colored line can arise even if the sample is sufficiently free of the analyte, the immunological test then runs e.g. in the manner of a competitive test.
- the test device and the test strip may be adapted to detect any analytes in food, but the analyte is preferably histamine, because in particular the histamine intolerance in large parts of the population causes great problems. Histamine is found, for example, in cheese, fish, vegetables, meat, and also in red wine, where widely varying histamine levels can be found in the same foods, and consumers also respond individually to different levels of histamine-loaded foods.
- the test device has a base body and a cap attachable to the body, wherein the receiving space provided in the cap and on the base body a plunger is arranged, which protrudes when plugged into the receiving space or is hineinbewegbar and is actuated such that a sample located in the receiving space is crushed and mixed with the running buffer.
- the test device consists of a possibly reusable body with a plunger, which is provided for crushing and mixing the sample with the running buffer.
- the receiving space is provided in which the sample is crushed and mixed with the running buffer.
- cap can be discarded after a successful test, it is possible to reuse the body, only the tappet must be cleaned under running water before reuse.
- the reservoir is provided with the running buffer in the receiving space and closed by a film which is pierced when placing the cap and / or crushing the sample.
- the cap can be provided with an individual running buffer for the respective analyte to be detected.
- the running buffer may be provided not only for diluting the sample so that it can participate in the capillary flow on the test strip, but it may also contain extraction reagents that facilitate the dissolution of the respective analyte from the sample of the food or only allow in individual cases. While the base body of the test device can thus be used for various analytes, a separate cap with a specific running buffer can be used for each analyte.
- test strip can not be reused, the test strip is also designed for the particular analyte.
- test strip can be delivered either together with the cap or together with the entire test device when the test device is designed as a total disposable part.
- test strip can also be provided as a separate asset, if the main body and possibly also the cap are designed to be reusable.
- the present invention relates not only to a test device with body, cap and test strips, but also a test strip provided for this test device as well as a main body and a cap in which a running buffer buffer contained is arranged.
- the reservoir can be closed by a film which is installed after the running buffer has been placed in the reservoir in or next to the receiving space. This film can be pierced when attaching the cap to the body or at the latest at the actuation of the plunger, so that the running buffer then comes into contact with the sample of the food.
- a modifying reagent for the analyte is provided, wherein the modifying reagent is presented either on the test strip or in a reservoir in the cap.
- the reservoir is provided with modifying reagent in the cap, so this reservoir can be completed by a film.
- the modifying reagent is provided on the test strip, it may be placed between the application zone and the first zone in which the labeled specific binding reagent is stored. When the prepared sample is applied to the test strip, it then first migrates to the area of the modifying reagent where the modification of the analyte contained in the sample takes place before it comes into contact with the labeled binding reagent.
- the modifying reagent and optionally also the labeled binding reagent can be arranged on a glaze provided on the porous support in order to provide sufficient time for the modification of the analyte and to provide for the resolubilization of the reagents.
- a glaze provided on the porous support in order to provide sufficient time for the modification of the analyte and to provide for the resolubilization of the reagents.
- the reservoir of running buffer and / or modifying reagent may preferably be formed by spheres stored in the receiving space, in which the running buffer and / or the modifying reagent are enclosed, and which are crushed when the sample is comminuted.
- Such beads which are also referred to as microcapsules, serve for the encapsulation of liquid substances, they are available for example from the company Inducap GmbH, 38302 Wolfenbüttel and have a diameter of, for example, 1 mm or 5 mm.
- microcapsules which can accommodate liquid components and are readily degradable, can be found in US 2010/00033300 A1.
- modifying reagent and running buffer can be stored separately from one another, and, on the other hand, the cap can also be reusable, if after a previous use Not only the main body, but also the cap is rinsed out and before the next use provided for the analyte reservoirs to be introduced into the cap and the corresponding test strip is attached to the test device.
- the base unit, cap and test strips are designed as a disposable device, so that all reagents and mechanical components are provided in this disposable article, which are provided for the detection of a particular analyte, in particular of histamine.
- the beads which form the reservoir of running buffer or possibly the reservoir of modifying reagent, can be fixed by a film in the receiving space, this film as in a liquid-stored running buffer and / or modifying reagent by attaching the cap on the Body and / or crushing of the then abandoned on the foil food sample is destroyed, so that a mixing of the sample with the running buffer and possibly the modifying reagent can take place.
- the modifying reagent is preferably 2-iminothiolane (Traut's reagent).
- 2-iminothiolane the inventors were able to generate several monoclonal antibodies which, in the immunoassay to be described below, allow detection of histamine in food samples in the order of a few ppb, the time for modification of the histamine contained in the food only takes a few minutes. The detection of histamine in foods using a modification with Traut's reagent can therefore be carried out very quickly and very sensitively, which is why this method is suitable for use in the restaurant or in everyday life shopping.
- an actuating knob is provided on the base body, via which the plunger is displaceable in its longitudinal direction relative to the base body, preferably between plunger and actuating button a rotary mechanism is provided which converts a longitudinal movement of the actuating knob into a rotary movement of the plunger, wherein more preferably the rotary mechanism then converts the longitudinal movement of the actuating knob into a rotary movement of the plunger when the actuating knob moves in the longitudinal direction relative to the plunger.
- the plunger not only serves to crush or crush the food, it also serves to swirl the food in the receiving space, whereby the swirling speed is determined by the gap that forms between the head of the plunger and the receiving space becomes.
- the receptacle for the test strip can be arranged on the base body or on the cap, wherein the receptacle for the test strip is preferably connected via at least one opening with the receiving space, which is closed by a removable seal against the receiving space, wherein Preferably, the opening is connected via a filter with the receiving space.
- the opening connecting the receptacle with the receptacle for the test strip can also be provided in the cap, so that no longer channels are required to the liquid sample to guide the test strip.
- test strip on the cap is also advantageous if the cap - possibly with the test strip - to be provided as a separate supplier part, so if the main body is reused, but cap and test strips are disposable items.
- the seal is removed so that the receiving space is in fluid communication with the test strip.
- Via a filter in this opening when the sample is applied to the test strip, it is then not possible to retain sufficiently homogenized sample material so that only liquid sample reaches the test strip.
- a punching sleeve for removing a sample of the food and for transferring the sample is arranged in the receiving space on the base body, wherein preferably the plunger is arranged in the punching sleeve.
- the removal of the sample from the food can be done in a simple, fast and hygienic way. It is only necessary to remove the cap from the body and then pierce the punching sleeve in the food so as to take a sample of the food.
- the diameter of the punching sleeve and the immersion depth in the food which can be specified for example by outside provided on the punch sleeve color marking, the volume of the recorded sample can be precisely defined, so that the volume of the sample on the amount of running buffer and the test still to be performed can be coordinated.
- the amount of the sample of the food must be known within certain limits, and further the volume of the sample must be matched to the volume of running buffer and possibly Modcertainsreagenz.
- the volume of the various foods can be set so far that, despite the simple mechanical construction and the simple test procedure, a sufficiently accurate test can be carried out for the purposes of the present application.
- the sample is automatically pushed from the punching sleeve into the receiving space after placing the cap on the base body and the advancement of the plunger, where the film is then pierced during further advancement of the plunger, the There, the reservoir of running buffer and / if necessary. Modifying reagent covers or holds.
- the receptacle for the test strip is arranged on the cap and at least one opening is provided in the cap, which connects the receiving space with the receptacle for the test strip, wherein the punch sleeve has a front cylindrical jacket, which at plugged cap which closes at least one opening.
- the sealing of the opening takes place through the punching sleeve when the cap is pushed onto the base body.
- this opening can then be released, so that the prepared sample can then pass over to the test strip, which can be provided that the cap can be further pushed onto the base body in this twisted position to in the Recording space to build up an overpressure, which supports the abandonment of the now liquid sample and / or accelerated.
- the punching sleeve is mounted longitudinally displaceably on the base body, in its extended basic position with its front cylindrical shell covering at least one opening, and in its retracted position which releases at least one opening, wherein preferably the punching sleeve on a pushable latch is held in the home position.
- the opening is not released by a possibly inaccurate rotation of the cap relative to the base body, but by pushing back the punching sleeve.
- the plunger is connected via a shaft with the actuating button, which is sealed by a sealing ring inside against the punching sleeve and lockable with the shaft, so that the liquid sample during advancement of the plunger and released opening by in the overpressure generated in the receiving space is placed on the test strip.
- This measure also facilitates the handling of the new test device, because after the release of the opening between the receiving space and the recording for the test strip only the plunger must be advanced again so as to transfer by overpressure the liquid sample on the test strip. In particular, if a filter is still in the opening, this ensures the successful course of the test. It is preferred if the cap has lateral recesses through which the punching sleeve can be grasped with an attached cap by an operator and moved in the direction of the base body.
- the labeled binding reagent comprises analyte-specific antibodies bound to particulate tracers and when the binder immobilized in the detection zone has the analyte.
- the labeled binding reagent in this embodiment is a conjugate of an antibody and a particle, for example a gold bead, wherein an analyte-protein conjugate is immobilized in the detection zone. If there is no analyte in the applied sample, the antibody-particle conjugates travel through the detection zone to the control zone. On the other hand, if analyte is present in the liquid sample, at least some of the antibody-particle conjugates are captured and concentrated by the analyte immobilized in the detection zone, resulting in a visible line.
- the labeled binding reagent comprises the analyte bound to particulate labels and when the analyte immobilized in the detection zone has specific antibodies to the analyte.
- This test is also a competitive test in which the analyte-particle conjugates compete with the analyte optionally contained in the liquid sample for the antibodies immobilized in the detection zone.
- a modifying reagent for the analyte is provided on the carrier, wherein the modifying reagent is preferably 2-iminothiolane.
- the modifying reagent modifies the analyte contained in the liquid sample so that it binds particularly strongly to the antibodies used in the test downstream, which shifts the detection limit to the range of a few ppb.
- the labeled binding reagent comprises analyte-specific antibodies bound to particulate labels, biotin-bound analyte on the support, and the binder immobilized in the detection zone binds to biotin.
- the analyte present in the liquid sample and the biotin-bound analyte presented on the test strip compete for binding with the antibody conjugated to the particulate label. If analyte is not present in the sample, the label antibody-antibody conjugates are captured on the binder in the detection zone, which binder may be streptavidin or avidin.
- analyte if analyte is present in the sample, the analyte saturates the antibodies in the label-antibody-conjugate such that no label-antibody conjugates are concentrated in the detection zone.
- a certain ratio must be present between the analyte conjugate presented and the free analyte in the liquid sample. At a ratio of, for example, 1: 1 is still 50% of the label conjugate bound in the detection zone. This ratio is determined once for a desired detection limit of a particular analyte and taken into account in the specification for the volumes of sample, running buffer and possibly modifying reagent.
- a control zone is arranged, is immobilized in the binder for the labeled binding reagent.
- Fig. 1 is a side view of the new, assembled test device, in a schematic, not to scale true representation
- FIG. 2 shows a longitudinal section through the test device from FIG. 1;
- FIG. Figure 3 is a longitudinal section through the main body of the test apparatus of Figure 1, wherein the shaft of the actuating knob is not cut ..;
- FIG. 4 shows a longitudinal section through the cap of the test apparatus from FIG. 1;
- Fig. 5 is a schematic plan view of a test strip, as in the
- Test device of Figure 1 can be used;
- Fig. 6 is a plan view of the test strip of Fig. 5 after a successful
- Fig. 7 is a plan view of the test strip on Fig. 5 after a successful
- FIG. 8 shows the binding behavior of a monoclonal antibody in a free histamine competition assay
- FIG. 9 shows the binding behavior of the monoclonal antibody of FIG. 8 in a modified histamine competition assay
- FIG. 10 shows the binding behavior of the monoclonal antibody from FIG. 8 in a modified histamine competition assay for two different incubation times during the modification.
- Fig. 1 is shown in a schematic, not to scale side view of a test device 10 for the investigation of a food on an analyte.
- the test device 10 comprises a cylindrical base body 1 1, on which a cap 12 is attached with a tip 13.
- the cap 12 is locked on two legs 14 on an undercut 15 on the base body 1 1 and can be removed from the base body 1 1 and put back on this.
- the base body At its remote from the undercut 15 rear end 16, the base body on an actuating knob 17 which is guided via a shaft 18 longitudinally displaceable in the base body 1 1, which is indicated by a double arrow 19.
- a cylindrical blind hole 23 is provided, which extends from the rear end 16 to a bottom 24 in which a through hole 25th is arranged.
- a shaft 26 which extends through the through hole 25 into the punch sleeve 22, where it carries a plunger 27 extends.
- a cylinder part 28 is arranged on the shaft 26, on which a radially projecting pin 29 is provided.
- the cylinder part 28 is arranged in a blind hole 31 of the shaft 18, wherein the bolt 29 extends radially outward through a helical groove 32 which extends in a cylindrical wall 33 which surrounds the blind hole 31.
- the blind hole 31 which is open to the right in FIG. 2 has a bottom 34. Between the bottom 34 and the cylinder part 28, a compression spring 35 is arranged, which presses the shaft 18 and the shaft 26 apart. By running in the helical groove 32 bolts 29, the arrangement of shaft 18, compression spring 35 and shaft 26 is held together.
- the shaft 18 Projecting into the blind hole 23, the shaft 18 has an end face 36. Between the end face 36 and the bottom 28, another compression spring 37 is attached. orders, which presses the arrangement of shaft 18 and shaft 26 relative to the main body 1 1 in Fig. 2 to the left.
- a sample of the food is introduced into the receiving space 38 in the case of the cap 12 withdrawn from the base body 11.
- Fig. 3 the base body 1 1 is shown cut, in which case the shaft 18 is not cut, so that the helical groove 32, in which the bolt 29 extends, can be seen better.
- the cap 12 is subtracted in the illustration of Fig. 3 of the main body 1 1, so that the punch sleeve 22 is exposed.
- a sealing ring 41 which bears sealingly against a cylindrical inner wall 42 of the plunger 22.
- the left side of the sealing ring 41 is followed by a cylindrical holding part 43, in which 44 balls 45 are seated in radially distributed recesses, against which a collar 46 is applied, which is connected to the punch sleeve 22.
- the holding part 43 and the collar 46 are arranged in a cylinder chamber 47 open to the right in the front end 21 of the base body 1 1, wherein the cylinder chamber 47 is closed by a bottom 48 which extends parallel to the bottom 24.
- the collar 46 is supported on a in Fig. 2 to be recognized compression spring 50, which is arranged in the cylinder chamber 47 between the collar 46 and bottom 48, so that the punch sleeve 22 in its extended basic position, shown in Fig. 3 is locked.
- the punching sleeve 22 has at its front end a thin-walled portion 49, which serves to sample from a food indicated at 51
- the seals 58 and 59 are applied to the base body 1 1 plugged cap 12 on the cylindrical shell 55 and thus seal off a provided with a filter 61 a opening 61, which connects the receiving space 38 with a receptacle 62 for a test strip , which can be inserted into the receptacle 62.
- the receptacle 62 is formed on one of the two legs 14 of the cap 12.
- the receiving space 38 is further closed by a film 63, which seals a reservoir of beads 64, which are arranged in the receiving space 38 and contain a running buffer and optionally a modifying reagent.
- the running buffer and modifying reagent are needed to perform the test on the test strip, as will be described below.
- the sample 52 is now ground by the plunger 27, wherein at the same time the beads 64 are broken, so that the running buffer and possibly the modifying reagent are released and mixed with the sample 52.
- a running buffer for example, phosphate buffer or PBS 0.1% Tween can be used.
- modifying reagent If there is a reservoir of modifying reagent in the cap 12, then a few minutes must be allowed for the modifying reagent to be able to modify the analyte optionally contained in the sample 52.
- sealing ring 41 and holding member 43 are held immovably against the collar 46, so that when moving the actuating knob 17 in Fig. 2 to the right Shaft 26 passes through the sealing ring 41 and the holding part 43.
- sealing ring 41 and holding member 43 are immovably connected to the shaft 26 so that now when moving the actuating knob 17 to the right of the sealing ring 41 and Holding member 43 are moved with the shaft 26 with, which leads to the compression in the receiving space 38.
- the operating knob 17 is thus pressed again, so that the plunger 27 and with it the sealing ring 41 are moved to the receiving space 38, which leads to an overpressure in the receiving space 38.
- the liquid sample located in the receiving space 38 is conducted through the opening 61 into the receiving space 62 and at the same time filtered through the filter 61 a, so that residual particles of the sample 52 can not reach the test strip.
- the liquid sample then reaches the test strip.
- FIG. 5 schematically shows in plan view a test strip 67 which comprises a porous support 68 which is made, for example, from nitrocellulose and provides for a capillary flow of a liquid sample which is applied to the porous support 68 at an application end 69 is then moved downstream along an arrow 71 in the porous support 68.
- a test strip 67 which comprises a porous support 68 which is made, for example, from nitrocellulose and provides for a capillary flow of a liquid sample which is applied to the porous support 68 at an application end 69 is then moved downstream along an arrow 71 in the porous support 68.
- a modifying reagent zone 72 Downstream of the applicator end 68, on the porous support 68 are successively a modifying reagent zone 72, a labeled analyte-specific binding reagent zone 73, a capillary flow zone 74, a detection zone 75 in which Binder is immobilized, another capillary flow zone 76, a control zone 77 in which binders for the labeled binding reagent from zone 73 are immobilized, and a suction zone 78 are arranged, which receives excess liquid sample.
- FIG. 6 shows the test strip 67 from FIG. 5 after a successful test, in which a colored line 79 or 81 can be recognized both in the detection zone 75 and in the control zone 77.
- the colored line 81 indicates that the test was successful, that is, that the liquid sample has passed through the porous support 68, with the sample having migrated the labeled binding reagent from the zone 73 through the support 68.
- the colored line 79 also indicates that in the liquid sample no or so little analyte was present that the labeled binding reagent could bind in the detection zone 75.
- FIG. 7 shows the test strip 67 from FIG. 5 after a test in which sufficient analyte was present in the liquid sample, so that no colored line can be seen in the detection zone 75, while the colored line 81 in FIG the control zone 77 again indicates that the test was completed successfully.
- the analyte is histamine
- different reagents are presented or immobilized in order to carry out a competition test, as has already been explained in principle at the outset.
- histamine specific antibodies are provided in this embodiment, which are bound to a particulate tracer such as gold beads. These are, for example, rat anti-histamine antibodies bound to gold beads.
- a histamine-protein conjugate is immobilized, the protein serving to permanently immobilize the conjugate in the detection zone.
- control zone 77 anti-rat IgG is immobilized.
- the anti-rat histamine conjugate from the capillary flow zone 73 passes through the detection zone 75 where it is sandwiched to the immobilized histamine and bound in control zone 77, where the anti-rat IgG concentrate the anti-rat histamine conjugate.
- histamine contained in the liquid sample would saturate the rat anti-histamine antibodies to such an extent that no binding to the immobilized histamine conjugate can take place in the detection zone so that the colored line 79 does not arise. If, on the other hand, no histamine is present in the sample applied, the rat anti-histamine conjugate can also bind in the detection zone and form the colored line 79.
- This embodiment corresponds to the variant A, but in addition a modifying reagent is provided in the zone 72, in this case 2-lminothiolan.
- histamine when histamine is present in the applied liquid sample, it is first modified by the modifying reagent, resulting in a significantly more effective binding of the modified histamine to the rat anti-histamine conjugate.
- the detection reagent makes the detection considerably more sensitive. While the detection limit in the variant A is in the range of ppm, it could be increased with the variant B in the range ppb.
- Fig. 8 shows the binding behavior of one of the monoclonal antibodies generated by the inventors in a competition assay with free histamine. Plotted were the maximum normalized levels of inhibition for different concentrations of histamine.
- the half-maximal inhibition for the five antibodies tested here is between 10 and 30 ppb.
- the modification of the histamine by the modifying reagent 2-iminothiolane takes place in a few minutes, as can be seen from the curves shown in FIG. 10, which for the antibody from FIGS. 8 and 9 show the binding behavior in a competition assay with free, modified Histamine, the circles corresponding to an incubation time of 5 minutes and the triangles corresponding to an incubation time of 10 minutes.
- the longer incubation of the histamine with the modifying reagent did not increase the sensitivity.
- This period of time can be ensured that either the length of the zone 74 is selected accordingly, so that during the capillary flow the discussed reactions can take place, or that the zones 69, 72 and possibly 73 are provided with a sugar glaze , as it is known from the aforementioned EP 291 194 B1.
- This glaze prevents immediate entry of the liquid into the porous support 68, thus delaying the test period, leaving enough time for modification of the free histamine.
- This test setup differs from variant B in that streptavidin is immobilized in the detection zone 75, while in the zone 72 biotin-modified histamine is introduced.
- Zone 73 rat anti-histamine conjugate binds in zone 75 only when there is no or as little free histamine in the applied liquid sample it is present that sufficient biotin-modified histamine can bind to the rat anti-histamine conjugates in order to concentrate them so far in the detection zone 75, that the colored line 79 is formed.
- the rat anti-histamine conjugates are saturated by the free histamine so that no binding of the rat anti-histamine conjugates in sufficient to form a colored line 79 in the detection zone 75 can form.
- the labeled binding reagent presented in zone 73 comprises a histamine-protein conjugate bound to particulate tracers, particularly colloidal gold.
- rat anti-histamine antibodies are immobilized, in the control zone 77 again anti-rat IgG.
- the labeled histamine-protein conjugates bind in both detection zone 75 and control zone 77. This results in the formation of colored lines 79 and 81.
- Variation E differs from variant D in that 2-iminothiolane is introduced in zone 72, which leads to a higher sensitivity of the detection test, as has already been described above in connection with variant B.
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Abstract
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PCT/EP2014/067881 WO2016026534A1 (de) | 2014-08-22 | 2014-08-22 | Testgerät zur untersuchung eines nahrungsmittels auf einen analyten und dafür vorgesehene teststreifen |
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WO2009048895A2 (en) * | 2007-10-07 | 2009-04-16 | Jordan Scott | Portable device for detecting food allergens |
US20100317033A1 (en) * | 2009-06-10 | 2010-12-16 | Matthew Philip Abdel | Methods and materials for detecting food containing allergens |
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