EP1207954A2 - Compositions utilisables pour l'hydratation d'un support d'electrophorese, pour l'electrophorese de zone - Google Patents
Compositions utilisables pour l'hydratation d'un support d'electrophorese, pour l'electrophorese de zoneInfo
- Publication number
- EP1207954A2 EP1207954A2 EP01907836A EP01907836A EP1207954A2 EP 1207954 A2 EP1207954 A2 EP 1207954A2 EP 01907836 A EP01907836 A EP 01907836A EP 01907836 A EP01907836 A EP 01907836A EP 1207954 A2 EP1207954 A2 EP 1207954A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrophoresis
- sample
- composition according
- acid
- concentration
- 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- Withdrawn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
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/447—Systems using electrophoresis
- G01N27/44704—Details; Accessories
- G01N27/44743—Introducing samples
Definitions
- Zone electrophoresis techniques in agarose gel allow the separation of the protein constituents contained in notably biological samples, such as serum, blood, urine, cerebrospinal fluid, etc.
- biological samples such as serum, blood, urine, cerebrospinal fluid, etc.
- the proteins deposited on the surface of the gel ionize and will migrate, under the effect of an electric field, at different speeds depending on their respective charge.
- the fineness of the bands obtained after electrophoresis corresponding to the separate constituents of the sample and therefore the resolving power of the technique depends mainly on the fineness of the deposition of the sample.
- sample applicators In order to improve the fineness of the deposit, different types of sample applicators can be used. These applicators, often called deposit combs, can come in different forms. They are illustrated in particular by the following devices:
- “Throat” combs the teeth of which bear a groove, the edges of which are parallel to the application plane, which makes it possible to recover a drop of biological sample by capillary action.
- the comb is then applied to the electrophoresis gel under the effect of its own weight.
- the teeth are then in contact with the gel surface and the sample transfers from the tooth to the gel.
- These combs can be made of a metallic or plastic material.
- the sample is taken by capillary action in the space delimited by the two strips and deposited on the gel in the same way as in the case of the throat comb.
- These combs can, like the previous ones, be made of a metallic or plastic material.
- Membrane combs whose teeth are made of microporous membrane. These combs are described in patents EP 0 493 996, US 5,464,515, US 5,405,516.
- the teeth are impregnated with the sample until the microporous membrane is saturated.
- the teeth of the comb are then brought into contact with the surface of the gel in the same way as in the two cases. precedents. In this case, the sample is deposited by diffusion of the proteins from the microporous membrane to the gel.
- the sample is usually diluted.
- the most generally used dilutions are from 1/3 to 1/10.
- the dilution is carried out in physiological water in order to maintain the solubilized proteins.
- the object of the invention is to provide a means of eliminating this trademark, whatever the type of applicator used.
- the deposit mark produced on the electrophoresis support can be eliminated or at least neutralized so that it does not affect the interpretation of the results obtained.
- After the electrophoresis by hydrating the electrophoresis support at the level of the sample deposition area compressed by the application of the sample applicator. This hydration must be carried out under conditions allowing the constituents and in particular the proteins contained in the test sample, to penetrate into this region of the electrophoresis support in order to undergo electrophoretic migration there.
- the area of the electrophoresis support compressed by the applicator used to deposit the sample must be rehydrated sufficiently quickly and efficiently, so that the constituents of the sample can penetrate into the electrophoresis support and undergo migration in the applied electric field.
- the hydration must occur in a duration interval corresponding to 10 to 20% of the time of the electrophoresis (the latter corresponding to the duration of application of the voltage at the terminals of the electrophoresis support), from the energization of the electrophoresis support.
- rehydration can occur more quickly, that is to say in a time less than 10% of the time of electrophoresis, from the power up.
- the inventors have identified certain compounds which, when introduced into the diluent of the sample and are therefore deposited at the same time as the sample on the electrophoresis support, are capable of removing the clear mark left by compression of the electrophoresis support. These compounds have the effect of eliminating or at least attenuating this clear mark from the first moments of electrophoretic migration, while this mark persists throughout the migration in the absence of said compounds.
- the subject of the invention is therefore a composition which can be used in a process for separating the constituents of a sample, by electrophoresis on a support electrophoresis, comprising one or more ionic compounds allowing, during the application of an electric field at the level of an electrophoresis support having negative surface charges, a hydration of the deposit zone of the sample to be separated , when this zone bears a compression mark resulting from the deposition of the sample. This compression results from the pressure exerted by the applicator on the support.
- the presence of negative surface charges at the level of the electrophoresis support indicates a non-zero electroendosmosis (or electroosmotic flow capacity).
- the compression of the electrophoresis support resulting from the deposition of the sample by means of the applicator can be observed with the naked eye and corresponds to a hollow mark in said support.
- a mark can for example be described as having the shape of a V, generally of a depth less than 100 ⁇ and having a width of approximately 1 mm between the two upper parts of the V for an electrophoresis support constituted by 0.8% agarose gel, when the pressure of the applicator is greater than 0.1 g / mm 2 .
- the ionic compounds used for the preparation of the composition of the invention can, depending on the case, move or on the contrary remain essentially immobile during the electrophoretic migration.
- the absence of displacement in the electric field is attributable either to the nature of the compound or to its concentration in the composition, or even to a combination of these elements.
- the concentration of ionic compounds present in the composition is determined according to the nature of these compounds , and in particular their capacity or not to migrate in the electrophoresis support after the application of the electric field. This concentration must be chosen so as to allow hydration, from the first moments of the electrophoretic migration, of the zone of deposit of the sample at the level of the electrophoresis support.
- the hydration or rehydration effect of the electrophoresis support sought which depends, as indicated above, on the nature of the ionic compounds used, can also be influenced by the composition of the electrophoresis support and in particular its electroendosmosis index.
- the electrophoresis support is an agarose gel
- agarose gels will be used. having a non-zero electro-osmotic flow capacity, for example corresponding to a relative mobility index, -mr greater than or equal to 0.07.
- the ionic compounds used in the context of the invention are dissolved to form the composition defined above. They are used at a determined concentration below their solubility limit.
- the composition comprises one or more ionic compounds chosen from those which do not undergo significant displacement in an electric field.
- these compounds allow the rehydration of the area of the compressed electrophoresis support, but do not migrate with the constituents of the sample during electrophoresis.
- the invention advantageously relates to a composition comprising one or more ionic compounds chosen from zwitterionic compounds.
- amino acids corresponding to the formula NH 2 -R-COOH in which R comprises an uncharged polar side chain will be used for the production of the composition according to the invention.
- the amino acids chosen can be amino acids corresponding to the formula NH 2 -R-COOH, in which R comprises a basic side chain.
- amino acids corresponding to one or other of the preceding definitions can be used alone or, where appropriate, as a mixture, optionally in mixture with other compounds, ionic or nonionic, which can be used to obtain rehydration of the electrophoresis support, when this support can undergo electroendosmosis.
- amino acid suitable for the preparation of the composition of the invention By way of example of an amino acid suitable for the preparation of the composition of the invention, mention will be made of: glycine (preferably at a concentration compatible with its solubility in water at 25 ° C. and in this respect, a concentration between 1 M and 3.33 M is usable), phenylalanine at a concentration of 0.28 M.
- Other examples are the amino acids chosen from L-lysine advantageously at a concentration greater than or equal to 1 M, L-arginine preferably at a concentration between 0.45 M and 0.86 M, L-histidine preferably at a concentration of 0.27 M.
- TRICIN N-tris ( hydroxymethyl) methyl-glycine
- MOPS 3- (N-Morpholino) propanesulfonic acid
- TAPS N-tris (Hydroxymethyl) methyl-3aminopropanesulfonic acid
- AMPSO (3 - ((1, 1-Dimethyl-2-hydroxyethyl) amino) -2-hydroxy-propanesulfonic acid)
- EPPS N- (2-Hydroxyethyl) piperazine-N '- (3-propanesulfonic acid)
- these salts can be chosen from NaCI, KCI or NaHCO 3 at a concentration greater than or equal to 1 M or a boric acid salt at a concentration greater than or equal to 0.15 M or a salt of phosphoric acid, or acetic acid at a concentration greater than or equal to 0.5 M.
- the subject of the invention is therefore the use of a composition corresponding to one of the definitions given above, or to several of these definitions taken in combination, for the hydration of an electrophoresis support, at the level of the sample deposition zone to be separated by electrophoresis.
- This use can be made in the form of a dilution of the sample to be separated by electrophoresis using the composition according to the invention.
- the invention also relates to a kit intended for the implementation of a process of separation by electrophoresis, of the constituents of a sample, characterized in that it comprises: - a composition defined above, - a support electrophoresis consisting of a gel having a non-zero electro-osmotic flow.
- a kit thus defined can also include any other reagent or device usually present in electrophoresis kits, such as migration buffers, and the developers used to identify the constituents separated by electrophoresis from the sample.
- An electrophoresis support which can be used for carrying out the invention is generally a gel and in particular a gel having a non-zero electro-osmatic flow.
- agarose gels and in particular agarose gels HGT® or HEEO®, from the company FMC-BIOWHITTAKER or agaroses LE® or SHE® from the company HISPANAGAR or their mixtures.
- agarose gels have the property of exhibiting non-zero electroendosmosis.
- the agarose gels used to prepare the electrophoresis supports according to the invention have a concentration of 0.8 to 1% in agarose, and can contain agaroses in a mixture.
- the invention also relates to a method of separation by electrophoresis of the constituents of a sample comprising:
- the revelation can be carried out by means of dyes and in the case of immunofixation, by means of antisera and dyes.
- the previously defined process can be implemented according to the usual methods of electrophoresis and can in particular comprise, for the revelation of the constituents separated by electrophoresis, an immunofixation procedure.
- the method according to the invention implementing the composition defined above can be effectively used to detect the presence of paraproteins in a biological sample.
- This process can be implemented advantageously in the context of zone electrophoresis separation.
- the simultaneous deposition of the sample and of the composition of the invention allows the rehydration of the gel in the very first moments of the electrophoretic migration.
- the sample and the composition of the invention can be combined, if necessary, before their deposition on the electrophoresis support, in particular by diluting the sample in the composition.
- Example 1 Typing of serum paraproteins diluted in a tricin solution (0.45 M), on an immunofixation gel.
- tricin dissolved in 4 ml of water.
- the diluent thus formed is ready for use.
- the serum sample to be typed was diluted in the diluent by a third for the track corresponding to the electrophoretic profile, as well as for the tracks IgA, IgM, IgK and Ig ⁇ (for example, 30 ⁇ l of serum and 60 ⁇ l of diluent) and sixth for the IgG revelation track (for example, 20 ⁇ l of serum and 100 ⁇ l of diluent).
- the typing of the paraproteins was carried out by incubating each migration track with a specific antiserum (anti IgG, anti IgA, anti IgM, anti IgK, anti Ig ⁇ ) and the track corresponding to the electrophoretic profile with a protein binding solution. The excess reagent was removed, the gel was dried and stained with acid violet.
- a specific antiserum anti IgG, anti IgA, anti IgM, anti IgK, anti Ig ⁇
- Example 2 Typing of serum paraproteins diluted in a solution of Arginine (0.86 M), on an immunofixation gel.
- 0.6 g of L Arginine was dissolved in 4 ml of water in a test tube.
- the diluent thus formed is ready for use.
- the serum sample to be typed was diluted in the diluent by a third for the track corresponding to the electrophoretic profile, as well as for the tracks IgA, IgM, IgK and Ig ⁇ (for example, 30 ⁇ l of serum and 60 ⁇ l of diluent) and sixth for the IgG revelation track (for example, 20 ⁇ l of serum and 100 ⁇ l of diluent).
- 4 ml of physiological water was introduced which made it possible to dilute the same sample in an identical manner to the previous case.
- the applicator thus loaded was then applied to the surface of the IF gel for 1 minute.
- Example 3 Typing of serum paraproteins diluted in a solution of sodium chloride (1.2 M), on an immunofixation gel.
- the serum sample to be typed was diluted in the diluent by a third for the track corresponding to the electrophoretic profile, as well as for the tracks IgA, IgM, IgK and Ig ⁇ (for example, 30 ⁇ l of serum and 60 ⁇ l of diluent) and sixth for the IgG revelation track (for example, 20 ⁇ l of serum and 100 ⁇ l of diluent).
- the applicator thus loaded was then applied to the surface of the IF gel for 1 minute.
- the separation of these samples applied to the IF gel was obtained by electrophoresis for approximately 10 minutes and at a power of 20 W, on an instrument making it possible to regulate the temperature at 20 ° C.
- the typing of the paraproteins was carried out by incubating each migration track with a specific antiserum (anti IgG, anti IgA, anti IgM, anti IgK, anti Ig ⁇ ) and the track corresponding to the electrophoretic profile with a protein fixing solution. . The excess reagent was removed, the gel was dried and stained with acid violet.
- a specific antiserum anti IgG, anti IgA, anti IgM, anti IgK, anti Ig ⁇
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0002206 | 2000-02-22 | ||
FR0002206A FR2805175B1 (fr) | 2000-02-22 | 2000-02-22 | Compositions utilisables pour l'hydratation d'un support d'electrophorese, pour l'amelioration de l'electrophorese de zone |
PCT/FR2001/000478 WO2001062369A2 (fr) | 2000-02-22 | 2001-02-16 | Compositions utilisables pour l'hydratation d'un support d'electrophorese, pour l'electrophorese de zone |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1207954A2 true EP1207954A2 (fr) | 2002-05-29 |
Family
ID=8847266
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01907836A Withdrawn EP1207954A2 (fr) | 2000-02-22 | 2001-02-16 | Compositions utilisables pour l'hydratation d'un support d'electrophorese, pour l'electrophorese de zone |
Country Status (8)
Country | Link |
---|---|
US (2) | US6572746B1 (fr) |
EP (1) | EP1207954A2 (fr) |
JP (1) | JP2003523525A (fr) |
AR (1) | AR027339A1 (fr) |
AU (1) | AU3571101A (fr) |
FR (1) | FR2805175B1 (fr) |
TW (1) | TW572772B (fr) |
WO (1) | WO2001062369A2 (fr) |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3482943A (en) * | 1966-02-14 | 1969-12-09 | Miles Lab | Reagent deposition device |
US3932229A (en) * | 1974-11-15 | 1976-01-13 | Millipore Corporation | Method of sample application to gel electrophoresis media |
DE2614192C2 (de) * | 1976-04-02 | 1986-09-18 | FMC Corp., Wilmington, Del. | Analysenvorrichtung und Analysenverfahren |
GB8513152D0 (en) * | 1985-05-24 | 1985-06-26 | Ciba Geigy Ag | Diagnostic strips |
US4857163A (en) * | 1987-07-17 | 1989-08-15 | Beckman Instruments, Inc. | High resolution electrophoretic gel and method for separating serum proteins |
US5171410A (en) * | 1989-10-20 | 1992-12-15 | Helena Laboratories Corporation | Method and formulation for creating kinase isoform separation |
US5064519A (en) * | 1990-06-29 | 1991-11-12 | E. I. Du Pont De Nemours And Company | Neutral and positively charged dyes for electrophoresis sample loading solutions |
US5035287A (en) * | 1990-07-30 | 1991-07-30 | Oryz Energy Company | Redox gel process for more uniform fluid flow in formations |
US5405516A (en) | 1991-01-04 | 1995-04-11 | Sebia | Apparatus for the application of biological samples to an electrophoretic slab support |
FR2671290B1 (fr) | 1991-01-04 | 1993-04-16 | Sebia Sa | Dispositif pour l'application d'echantillons biologiques sur une plaque d'electrophorese. |
US5159049A (en) * | 1991-04-22 | 1992-10-27 | Allen Robert C | Method for stabilizing polyacrylamide gels |
US5503722A (en) * | 1994-02-28 | 1996-04-02 | Beckman Instruments, Inc. | Rehydratable gels for capillary electrophoresis |
US5498536A (en) * | 1994-04-22 | 1996-03-12 | American Cyanamid Company | Chondroitinase II from Proteus vulgaris |
US5840338A (en) * | 1994-07-18 | 1998-11-24 | Roos; Eric J. | Loading of biologically active solutes into polymer gels |
US5681437A (en) * | 1995-10-31 | 1997-10-28 | Isolab, Inc. | Sample deposition device |
US5683915A (en) * | 1995-10-31 | 1997-11-04 | Isolab, Inc. | Sample deposition device and method |
US5993627A (en) * | 1997-06-24 | 1999-11-30 | Large Scale Biology Corporation | Automated system for two-dimensional electrophoresis |
WO1999013987A1 (fr) * | 1997-09-16 | 1999-03-25 | Life Technologies, Inc. | Adaptateur de chargement de gel |
AUPP108697A0 (en) * | 1997-12-23 | 1998-01-22 | Macquarie Research Limited | Apparatus for electrophoresis |
US6232070B1 (en) * | 1998-11-09 | 2001-05-15 | Stewart Shuman | Pharmacological targeting of mRNA cap formation |
US6232076B1 (en) * | 2000-02-04 | 2001-05-15 | Genaissance Pharmaceuticals, Inc. | Stabilizer of dye sequencing products |
-
2000
- 2000-02-22 FR FR0002206A patent/FR2805175B1/fr not_active Expired - Fee Related
- 2000-06-07 US US09/589,008 patent/US6572746B1/en not_active Expired - Fee Related
-
2001
- 2001-01-31 AR ARP010100439A patent/AR027339A1/es unknown
- 2001-02-16 JP JP2001561425A patent/JP2003523525A/ja active Pending
- 2001-02-16 EP EP01907836A patent/EP1207954A2/fr not_active Withdrawn
- 2001-02-16 AU AU35711/01A patent/AU3571101A/en not_active Abandoned
- 2001-02-16 WO PCT/FR2001/000478 patent/WO2001062369A2/fr not_active Application Discontinuation
- 2001-02-21 TW TW90103911A patent/TW572772B/zh active
-
2002
- 2002-12-11 US US10/316,310 patent/US20030079988A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO0162369A3 * |
Also Published As
Publication number | Publication date |
---|---|
FR2805175A1 (fr) | 2001-08-24 |
US6572746B1 (en) | 2003-06-03 |
WO2001062369A2 (fr) | 2001-08-30 |
AU3571101A (en) | 2001-09-03 |
AR027339A1 (es) | 2003-03-26 |
WO2001062369A3 (fr) | 2002-03-14 |
FR2805175B1 (fr) | 2002-05-10 |
US20030079988A1 (en) | 2003-05-01 |
JP2003523525A (ja) | 2003-08-05 |
TW572772B (en) | 2004-01-21 |
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