EP0377016A1 - Verfahren zur trennung und wiedergewinnung von geladenen molekülen - Google Patents

Verfahren zur trennung und wiedergewinnung von geladenen molekülen

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Publication number
EP0377016A1
EP0377016A1 EP19890906608 EP89906608A EP0377016A1 EP 0377016 A1 EP0377016 A1 EP 0377016A1 EP 19890906608 EP19890906608 EP 19890906608 EP 89906608 A EP89906608 A EP 89906608A EP 0377016 A1 EP0377016 A1 EP 0377016A1
Authority
EP
European Patent Office
Prior art keywords
polymer
electrically conductive
current
ligand
molecules
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Withdrawn
Application number
EP19890906608
Other languages
English (en)
French (fr)
Inventor
Barbara Schneider
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BIOSYN-R Corp
Original Assignee
BIOSYN-R Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BIOSYN-R Corp filed Critical BIOSYN-R Corp
Publication of EP0377016A1 publication Critical patent/EP0377016A1/de
Withdrawn legal-status Critical Current

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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02—Column chromatography
    • G01N30/50—Conditioning of the sorbent material or stationary liquid

Definitions

  • the present invention relates to a selective method for the purification and recovery of charged molecules from mixtures. More particularly, the present invention is concerned with the purification of horticultural factors or biologically active factors on a chromatographic and/or electrophoresis apparatus through the use of electrical current or voltage. The invention also provides an apparatus for performing electrical chromatography.
  • volume reduction may not appear relevant at the lab bench, it is essential for production. Process volumes should be reduced as early as possible, using techniques that offer both high capacity and high selectivity. Ion-exchange chromatography is thus a very good first step because of its capacity (approximately 30 mg protein per ml) and relatively low cost. As with other adsorption techniques, ion exchange is relatively independent of feed volume. However, ion exchange chromatography does not provide a high degree of selectivity and much of the active factors remain on the adsorbent. Gel filtration, though a frequent first step at the laboratory scale, is not suitable for handling large volumes. When gel filtration is used to separate molecules of similar molecular weights, sample sizes may range only from 1 percent to 3 percent of the total gel volume.
  • a 100-liter feed-stream would require a gel filtration column of 10,000-50,000 liters, whole the same 100-liter stream could possibly be applied to a 20-liter ion-exchange column, depending on the sample concentration and process conditions. If one is separating a large molecule from a small molecule—as in buffer exchange (or "desalting")—the applied sample volume may be up to 30 percent of the total gel volume.
  • Affinity chromatography the most selective technique, may be used fairly early in purification. There are drawbacks to using affinity chromatography if the affinity ligand is expensive and the feedstream fouls the media. The bulk of contaminants, such as lipids, should be removed first.
  • affinity chromatography must also employ the conventional purification techniques when the substrate is complex.
  • Electrophoresis provides an effective method for adsorbing or desorbing bound material. It is very useful for desorbing tightly bound material from affinity adsorbents and is especially useful for desorbing tightly bound substances such as antibodies and hormone-finding proteins. However, electrophoresis is dependent upon the selectiveness of the adsorbent utilized and the fluid medium through which the electrical current is passed.
  • the present invention provides an apparatus and a method for the separation and recovery of commercially useful products from a substrate. More particularly, the invention provides a means for the separation of biologically inert and/or biologically active factors from a substrate wherein the biologically active factors may be in the form of cell homogenates of organ tissues,- or microorganisms, of plant material and/or of body liquids.
  • a chromatographic column is filled with an electrically conductive polymer and an electrical current sufficient to cause binding is passed through the polymer.
  • the substance of interest in a suitable solvent is then eluted by altering the charges on the polymer.
  • the amount and type of current used can readily be determined beforehand by preliminary runs.
  • alternating current preferably 1-60 herz
  • Direct current 0.5 to 5 milliamp ⁇
  • fibroblasts lymphocytes
  • epithelial cells yeast, reticular endothelial cells, and the like. It is also possible to achieve a desirable separation with these cell types.
  • separation is achieved when a biospecific ligand is ionically attached to the chromatographic bed material by means of an electrical current or voltage while retaining a specific binding affinity for a factor of interest.
  • the fact is then passed through the column and the factor bound to the ligand.
  • the factor alone or together with the ligand to which it is bound may be detached by a change of electrical charge.
  • the selection of the ligand for the electrical chromatograph is influenced by two factors. First, the ligand should exhibit specific and reversible binding affinity for the factor to be purified. Second, it should have groups which allow it to covalently attach to the electrically charged matrix without destroying its binding activity.
  • the biological factors which can be separated in the process of the present invention may be animal, plant or microorganism.
  • the animal factors include those derived from mammalian, avian and amphibian or bacterial, fungal or viral origin. Those of fungal origin include aspergillus and rhizopus.
  • Bacterial microorganisms include and are not limited to Bacillus and Clostridium genera.
  • the method of the invention is especially useful in the separation and purification of chemical products derived in the cultivation of E. Coli and yeast through biotechnological procedures. That is, not only can the biologically active factors from naturally occurring microorganisms and cells be separated, but also factors from microorganisms and cells which have been modified by genetic engineering techniques, such as transformation, DNA insertions, transduction, fusion and the like.
  • the invention is especially useful in the separation of active factors derived from human . diploid cells.
  • the invention is adaptable to the separation and purification of all types of biological factors including, for example, the factors derived from mammalian, avian amphibian cells. Factors derived from embryonic, adult or tumor tissues as well as from established cell lines can thus be separated. Examples of typical cells from which the factors may be separated are primary rhesus monkey kidney cells, baby hamster kidney cells, pig kidney cells, mouse embryo fibroblasts, normal human lung embryo fibroblasts, HeLa cells, primary and secondary chick fibroblasts, and various cells transformed with SV-40 polyoma virus. Separation of the charged particles utilizing DC current is usually performed with about 0.5 ⁇ amps to 15 amps. Alternatively the charged particles can be separated with the use of constant current, constant potential, alternating current alone or pulsed with direct current, transversed alone or in combination with direct current or together with electrophoresis.
  • DC current is preferred for use in the separation of amino acids, proteins, glycoproteins, yeast, bacteria cells, nucleic acids, sugards, lipids, glycolipids, organelles, chromagens and inorganic charged molecules.
  • the cells can be harvested and further treated for the production of desired products by various means.
  • human diploid foreskin fibroblasts cultured by the method of this invention for example, see copending application U.S.S.N. 111,360 entitled “Method for Producing Cells” filed October 2, 1987 can be treated for the production of angiogenic factor, plas inogen activator and interfer ⁇ n.
  • the angiogenic factor alone can be isolated from the growth medium or from the cells.
  • Plasminogen activator can be separated from a serum-free maintenance medium during a period of aging after the cells have reached their maximum density.
  • the electrically conductive materials which may be utilized in the present invention are the natural and synthetic polymers including gums which are normally utilized in the cultivation of cells and which are are electrically conductive or have been made electrically conductive by incorporation or intercalation of other polymers or materials.
  • the aforementioned article of Qian, et al discloses such materials and how the material can be made electrically conductive.
  • One way of preparing conductive polymers is by polymerizing in situ acetylene, pyrrole, and thiophene in a flexible matrix as described by Qian, et al.
  • Molecular composites with polyacetylene, polypyrrole, polythiophene, polystyrene, and the like may be prepared with nylon, polyvinyl chloride, polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, polyethylene glycol, gelatin, collagen, guar gum, elastin, glycoproteins carotenoids, hemins, diazobenzyloxymethyl, nitrocellulose, paper, agarose, sepharose, sephadex, carbohydrate containing substances, and the like.
  • the following examples are illustrative of the present invention. It will be apparent to those skilled in the art that many modifications, both of materials and methods, can be made without departing from the spirit and scope of the invention.
  • a polysaccharide matrix, cellulose dialysis membrane, is suspended in a solution prepared by dissolving approximately 54 ml of pyrrole in 2000 ml of 0.10 M NaCl. The duration of the suspension (from seconds to days) and the temperature of the solution (from 0° to 20°C.) do not significantly affect the subsequent formation of the conducting polymer film.
  • the oxidizing solution is prepared by dissolving 46 g of ammonium persulfate ((NH4) 2 S 2 0 8 ) in 2000 ml of 0.10 M NaCl. The oxidizing solution is then added to the solution containing the monomer and the matrix. The solution changes color from clear to aqua to black.
  • the wash process removes excess conducting polymer from the conducting polymer film.
  • the resulting material is dried and ground to form a powder. Conductivity was measured and found to be 0.1 to 1 S/cm.
  • the polymer powder is suitable for chro atographing animal factors.
  • ferric chloride may be used.
  • a polysaccharide matrix, cellulose dialysis membrane, is suspended in a solution prepared by dissolving approximately 200 ml of aniline in 3000 ml of 1.0 M HC1.
  • the oxidizing solution is prepared by dissolving 111 g of ammonium persulfate ((NH 4 ) 2 S2 ⁇ 8 ) in 2000 ml of 1.0 M HC1.
  • the oxidizing solution is then added to the solution containing the monomer and the matrix. Over a period of several seconds (less than 1 minute) , the solution changes color from clear to aqua to green.
  • the cellulose matrix is removed and washed with copious quantities of 1.0 M HcL.
  • the wash process removes excess conducting polymer from the conducting polymer film.
  • the resulting material is allowed to dry and ground to a powder.
  • the conductivity is measured and found to be 0.1 to 1 S/cm. This polymer has been used for separating factors derived from fungal microorganisms.
  • the solution was then filtered through glass wool.
  • the dark filtrate contained polypyrrole polyvinyl alcohol (grafted) polymer in solution.
  • the filtrate was then poured slowly into 5 liters of acetonitrile and left undisturbed for 1-2 hours.
  • the casting of polymer on the organic solvent resulted in thin film of the polymer (black in color) .
  • the solvent was discarded and the black film was washed three times with 1 liter acetonitrile, dried and ground.
  • conductive polymers comprising polystyrene-pyrrole, polyvinylbutyral-pyrrole, polyethylene-pyrrole and polypropylene-pyrrole.
  • microgranular cellulose powder (Whatman, cc41, cat #4061 - 050) was suspended in 2 liters of monomer solution(108 ml of pyrrole/0.1 M NaCl) overnight at 4 C C. The suspension of cellulose powder was then stirred gently for 2 hours, after which 2 liters of 0.2 M ammonium persulfate in 0.1 M NaCl was added in a dropwise manner, with stirring. Stirring was continued for 1 hour, then the powder was washed three times with saline solution and then several times with water, till the supernatant was free of chloride ions. The aqueous suspension of cellulose was filtered and dried. The resistance of the cellulose was measured by two pin probes attached to a multimeter. The average resistance of the material was 0.1 to 0.7 k ohms, when the probes were placed about 1 to 2 cms apart.
  • Dispersion polymerization reactions were carried out in 5 1 flasks. Initially x g of PVA, plus 88.3 g (0.033 moles) of FeCl 3 • 6H 2 was dissolved in 1 of water. To this solution was added 10 ml (0.014 moles) of purified pyrrole monomer, and the mixture was stirred (magnetically) at 20 ⁇ C for 18-24 h. It was shown, in all cases, that greater than 95% conversion of monomer was achieved within this time. Within a few seconds of adding the pyrrole to the reaction mixture, the color changed from orange to brown-black, indicative of the onset of polymerization, but not precipitate was formed.
  • the dispersions formed were centrifuged at 15,000 rpm for about 1 h. This lead to a black sediment and a pale green, but transparent supernatant. Indeed, it was subsequently shown by visible absorption spectroscopy that the supernatant contained no polypyrrole. The sediment could be readily redispersed by shaking in pure water. The dispersions formed in this way showed no tendency to aggregate on standing. The aqueous dispersion were freeze-dried to yield a fine, black powder.
  • the current was changed to 3 milliamps and the column was eluted with buffer (30 ml) and the fractions were saved (II) .
  • the current was changed to 1.5 milliamps and the column was eluted with buffer (30 ml) and the fractions saved (III) .
  • the separation can also be performed with alternating current utilizing 0.5 ⁇ A - 10 A (1 - 60 Hz) .
  • alternating current utilizing 0.5 ⁇ A - 10 A (1 - 60 Hz) .
  • there may be utilized a constant potential or a potential gradient down the column.
  • EXAMPLE 8 The procedure of Example 7 was followed except that a constant potential of 3 V is applied to the column. The mixture of yeast is added to the column and eluted with buffer and the first fraction saved. The voltage was changed to 1.5 V and the column was further eluted with buffer and these fractions were saved.
  • the voltage was changed to 0.1 V and the remainder of the column was eluted.
  • EXAMPLE 9 A chromatographic column is filled with electrically conductive polypyrrole-agarose. Separate electrode sets were positioned to provide an angle of 115° between the fields. A programmed regulator was utilized for switching of fields so as to provide pulsed electrical fields alternating between AC and DC current. 100 volt potential was applied to each field and pulsed alternately every two seconds. The AC current applied was 20 Hz.

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Peptides Or Proteins (AREA)
EP19890906608 1988-05-17 1989-05-17 Verfahren zur trennung und wiedergewinnung von geladenen molekülen Withdrawn EP0377016A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US19501988A 1988-05-17 1988-05-17
US195019 1988-05-17

Publications (1)

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EP0377016A1 true EP0377016A1 (de) 1990-07-11

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EP (1) EP0377016A1 (de)
WO (1) WO1989011648A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996016331A1 (en) * 1994-11-18 1996-05-30 Aromascan Plc Method for depositing a conducting polymer into a tube by vapour phase chemical oxidation and its use as chromatography column
WO1998020043A1 (en) 1996-11-08 1998-05-14 Morphogenesis, Inc. Materials and procedures for the purification of cells
US6428666B1 (en) * 1999-02-22 2002-08-06 Sandia National Laboratories Electrokinetic concentration of charged molecules
DE60029794T2 (de) 1999-04-23 2007-10-18 Nexttec Gmbh Verwendung von mit polymer beschichtetem sorptionsmittelkomposit zur trennung, reinigung, entsalzung und konzentrierung von biopolymeren
EP2223307B1 (de) 2007-11-27 2018-09-19 Uppsala Universitets Projekt AB Verbundmaterialien mit einem intrinsisch leitenden polymer und verfahren und einrichtungen

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
US3346813A (en) * 1964-06-26 1967-10-10 Litton Systems Inc Converter using spin resonant material
US3640813A (en) * 1969-06-09 1972-02-08 Samuel T Nerenberg Adapter for a macromolecule separation device
US4238327A (en) * 1979-06-25 1980-12-09 Liburdy Robert P Electric resonance chromatography

Non-Patent Citations (1)

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Title
See references of WO8911648A1 *

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Publication number Publication date
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