WO1979000609A1 - Preparation of trichloro-s-triazine activated supports - Google Patents

Preparation of trichloro-s-triazine activated supports Download PDF

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Publication number
WO1979000609A1
WO1979000609A1 PCT/US1979/000081 US7900081W WO7900609A1 WO 1979000609 A1 WO1979000609 A1 WO 1979000609A1 US 7900081 W US7900081 W US 7900081W WO 7900609 A1 WO7900609 A1 WO 7900609A1
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triazine
support
organic solvent
activated
tst
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French (fr)
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A Johnson
L Hodgins
T Finlay
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New York University NYU
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New York University NYU
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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N11/00—Carrier-bound or immobilised enzymes; Carrier-bound or immobilised microbial cells; Preparation thereof
    • C12N11/02—Enzymes or microbial cells immobilised on or in an organic carrier
    • C12N11/10—Enzymes or microbial cells immobilised on or in an organic carrier the carrier being a carbohydrate
    • 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
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/3071—Washing or leaching
    • 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
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3202—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the carrier, support or substrate used for impregnation or coating
    • B01J20/3206—Organic carriers, supports or substrates
    • B01J20/3208—Polymeric carriers, supports or substrates
    • B01J20/3212—Polymeric carriers, supports or substrates consisting of a polymer obtained by reactions otherwise than involving only carbon to carbon unsaturated bonds
    • 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
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3214—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the method for obtaining this coating or impregnating
    • B01J20/3217—Resulting in a chemical bond between the coating or impregnating layer and the carrier, support or substrate, e.g. a covalent bond
    • 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
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3214—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the method for obtaining this coating or impregnating
    • B01J20/3217—Resulting in a chemical bond between the coating or impregnating layer and the carrier, support or substrate, e.g. a covalent bond
    • B01J20/3219—Resulting in a chemical bond between the coating or impregnating layer and the carrier, support or substrate, e.g. a covalent bond involving a particular spacer or linking group, e.g. for attaching an active group
    • 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
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3242—Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group
    • B01J20/3244—Non-macromolecular compounds
    • B01J20/3246—Non-macromolecular compounds having a well defined chemical structure
    • B01J20/3248—Non-macromolecular compounds having a well defined chemical structure the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such
    • 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
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3242—Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group
    • B01J20/3244—Non-macromolecular compounds
    • B01J20/3246—Non-macromolecular compounds having a well defined chemical structure
    • B01J20/3248—Non-macromolecular compounds having a well defined chemical structure the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such
    • B01J20/3251—Non-macromolecular compounds having a well defined chemical structure the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such comprising at least two different types of heteroatoms selected from nitrogen, oxygen or sulphur
    • 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
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3242—Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group
    • B01J20/3244—Non-macromolecular compounds
    • B01J20/3246—Non-macromolecular compounds having a well defined chemical structure
    • B01J20/3248—Non-macromolecular compounds having a well defined chemical structure the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such
    • B01J20/3253—Non-macromolecular compounds having a well defined chemical structure the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such comprising a cyclic structure not containing any of the heteroatoms nitrogen, oxygen or sulfur, e.g. aromatic structures
    • 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
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3242—Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group
    • B01J20/3244—Non-macromolecular compounds
    • B01J20/3246—Non-macromolecular compounds having a well defined chemical structure
    • B01J20/3248—Non-macromolecular compounds having a well defined chemical structure the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such
    • B01J20/3255—Non-macromolecular compounds having a well defined chemical structure the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such comprising a cyclic structure containing at least one of the heteroatoms nitrogen, oxygen or sulfur, e.g. heterocyclic or heteroaromatic structures
    • 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
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3242—Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group
    • B01J20/3268—Macromolecular compounds
    • B01J20/3272—Polymers obtained by reactions otherwise than involving only carbon to carbon unsaturated bonds
    • B01J20/3274—Proteins, nucleic acids, polysaccharides, antibodies or antigens
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
    • C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
    • C08B37/0036—Galactans; Derivatives thereof
    • C08B37/0039—Agar; Agarose, i.e. D-galactose, 3,6-anhydro-D-galactose, methylated, sulfated, e.g. from the red algae Gelidium and Gracilaria; Agaropectin; Derivatives thereof, e.g. Sepharose, i.e. crosslinked agarose
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S435/00—Chemistry: molecular biology and microbiology
    • Y10S435/814—Enzyme separation or purification
    • Y10S435/815—Enzyme separation or purification by sorption

Definitions

  • TITLE METHODS OF USING TR ⁇ CHLORO-S-TRIAZINE FOR COUPLING ENZYMES AND AFFINITY LIGANDS TO SOLID-PHASE SUPPORTS
  • the present invention is concerned with new methods and reagents for coupling proteins and a wide variety of non-protein affinity ligands by strong covalent chemical bonds to solid-phase supports for the preparation of solid-phase catalysts and biospecific adsorbents.
  • Biospecific adsorbents have become very important tools for the isolation of biologic macromolecules, while immobilized enzymes have found wide use as durable, solid-phase catalysts. Such materials are prepared by chemically linking enzymes, inhibitors, or other biospecific compounds to a solid-phase support.
  • Various methods and reagents have been described for the purpose of coupling, but each has its peculiar drawbacks, including: (a) weak chemical bonding; (b) ionic bonds; (c) necessity for strong conditions such as high temperature and pH to drive the reaction; (d) side reactions; and (e) limited range of chemical groups with which the coupling agent can react.
  • Previous coupling reagents include the reagent most widely utilized as a coupler, cyanogen bromide, as described by Jacoby et al. in Methods Enzymol. 34, 1974v
  • This reagent is reacted with supports such as agarose and cellulose in strongly alkaline solution where numerous side reactions occur.
  • the cyanogen bromide-activated support subsequently reacts poorly with nucleophiles other than alkylamines, a severe limitation on the kinds of enzymes, ligands and other compounds which can be coupled.
  • the coupling bonds probably isourea bonds, are only moderately stable, and substantial amounts of the bound substance may "bleed" under practical conditions. This instability limits the useful life of the adsorbent or solid-phase catalys and may add undesirable or potentially toxic contaminants to the product.
  • these isourea bonds are positively charged at neutral pH and can cause non-specific adsorption.
  • TsT trichloro-s-triazine
  • DsT dichloro-s-triazine
  • MsT disubstituted monochloro-s-triazine
  • TsT has been reacted with supports in strongly alkaline aqueous media where hydrolytic side reactions predominate.
  • the amount of TsT which reacts with support and that which hydrolyzes are competitive functions of temperature, pH and reagent concentration, and the extent of activation of the support cannot be predicted accurately.
  • the activated support is also subject to hydrolysis.
  • Kay and Lilly have introduced the less reactive coupler, 2-amino-4, 6-dichloro-s-triazine, as discussed in Biochim. Biophys. Acta. 198:276 (1970).
  • this reagent is subject to the same drawbacks as TsT during the activation reaction and, in addition, vigorous conditions are required for coupling the ligands.
  • the major probl-ems with such prior art methods are: (1) couplers are used empiripally as others have used cyanogen bromide; (2) although triazine coupling provides strong bonds between support and proteins, no attention has been previously paid to competitive hydrolytic side reactions and to the introduction of adsorptive ionic sites; ' (3) the amount of ligand incorporated cannot be accurately controlled or predicted; and (4) the procedures are not satisfactory for the incorporation of small ligands in organic phase.
  • Abuchowski et al. use benzene as a solvent for both PEG and TsT and use Na 2 CO 3 , to neutralize the HCl generated.
  • This method while adequate only for the coupling of TsT and PEG in solution phase, is not satisfactory for the coupling of TsT and any of the solid-phase supports utilized in affinity preparations, such as Sepharose, cellulose or polyvinyl alcohol.
  • Benzene has proved to be a poor medium for reactions involving Sepharose and other hydrophilic polymers, most likely because of the non-polar nature of benzene.
  • a major problem in the case of Sepharose or other polymers initially in aqueous phase is the transfer to benzene.
  • Neutralization of the HCl generated is inefficient when the base is insoluble, as is the case of Na 2 CO 3 in benzene. Inefficient neutralization of the HCl could permit conversion of the alcohol to the corresponding alkyl chloride, a side reaction known to occur under these conditions. Also, incorporation of chlorine into the Sepharose matrix is likely to impart undesirable properties.
  • Unreacted and hydrolyzed PEG-dichloro-s-triazine are, of course, soluble and separable from the PEG-coupled protein. This is not the case, however, if one wants a broader objective, i.e., coupling of an insoluble solid-phase compound such as cellulose-dichloro-s-triazine to a ligand where any side reactions such as hydrolysis affect the desired product.
  • control is established by replacing the second triazine chloride by a weak nucleophile such as analine. This leaves a single chlorine available for reaction with nucleophilic groups of the proteins or other substances to be immobilized. This single chlorine can be replaced quantitatively by aliphatic amines under mild conditions, yet it does not hydrolyze readily below pH 9 at room temperature.
  • Various supports can be reacted with TsT in accordance with the present invention, but all such supports must be rid of water prior to the initial reaction.
  • drying can be performed by heating in vacuo, or water may be dispersed from the support by washing with dry, miscible organic solvents such as 1,4-dioxane, acetonitrile and similar solvents.
  • miscible organic solvents such as 1,4-dioxane, acetonitrile and similar solvents.
  • the parameters of the reaction conditions can be altered to effect changes in the amount of TsT which reacts with the support, including changes in reaction temperature, reagent concentration, and the duration of the reaction.
  • TsT The reaction of TsT with the support in organic phase requires the presence of a suitable organic base.
  • bases generally employed in analogous acyl chloride type reactions such as triethylamine, pyridine, N-ethyl lrorpholine, and lutidine, were found to form insoluble complexes with TsT in organic solvents.
  • tertiary amines such as N,N-dimethylaniline and N,N-diisopropylethylamine did not form such complexes and performed satisfactorily.
  • Fig. 1 is a graph showing a comparison of the stability of ligands attached with CNBr to those attached with TsT;
  • Fig. 2 is a graph showing various characteristics of protein coupled to TsT-activated resin. DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • aqueous suspension of the 'support is washed with a series of dioxane-water solutions in which the amount of dioxane increases from 0 to 100%.
  • the support is transferred to a round bottom flask equipped with a glass-sealed stirrer and water condenser. Transfer is accomplished with a small amount of dioxane.
  • the reaction flask is immersed in a thermostated oil bath, and its contents stirred at low speed. N,N-diisopropyl- ethylamine or N,N-dimethylaniline in dioxane is added and the reaction is allowed to equilibrate.
  • the reaction is initiated by the addition of trichloro-s-triazine dissolved in dioxane.
  • trichloro-s-triazine dissolved in dioxane.
  • fluid and solid phases are of equal volume, and base concentration is twice that of the trichloro-s-triazine.
  • the amount of triazine incorporated into the support resin depends on trichloro-s-triazine concentration, length of reaction and reaction temperature.
  • the activated DsT support is then washed with several bed volumes of dioxane.
  • the activated support can be reacted in several different ways: (1) it can be reacted in organic dioxane with a strong nucleophile such as an alkyl amine to give a dialkyl-triazine-resin; (2) it can be reacted in dioxane with a weak nucleophile such as an aryl amine to give a monoaryl-triazine-resin with a chlorine still available for further reaction; (3) the monoaryl-triazine-resin can be washed with dioxane-water solutions containing decreasing amounts of dioxane and the resin, now in aqueous solution, can be reacted with either proteins or other nucleophiles; or (4) the organic solvent can be removed from the raonoarylmonochloro-s-triazine-resin by freeze-drying or other gentle means and the dried, activate
  • EXAMPLE 1 As a specific example, 100 ml of Sepharose CL-4B was washed with 200 ml of a mixture of water: dioxane (30:70) followed by 200 ml water: dioxane (70:30) and finally by 1000 ml dioxane. Washing was accomplished on a sintered glass funnel under vacuum. The resin was allowed to stand overnight in a glass stoppered graduated cylinder to accurately measure the bed volume and, after removing the excess dioxane, the settled gel was transferred with 60 ml dioxane to a 500 ml 3-necked round bottom flask equipped with a water jacketed condenser and a glass-sealed stirrer.
  • the reaction flask was immersed in a thermostated oil bath maintained at 50 ⁇ 2°C and the contents were stirred at 100 rpm. The amount of 20 ml of 2 M N, N-diisopropyl ethyl amine in dioxane was then added . After 30 min, 20 ml of 1 M trichloro-s-triazine in dioxane was added to initiate the reaction . After 60 min at 50 ° , the activated resin was washed on a sintered glass funnel with 1000 ml of dioxane. The resin was found to contain 112 ⁇ moles triazine per gram of resin. A portion of the resin was then reacted with 2 volumes per bed volume of resin, of
  • a second portion was reacted with 2 volumes of aniline in dioxane at room temperature for 30 min. and was subsequently washed with 5 bed volumes of dioxane on a sintered glass funnel .
  • a portion of this latter resin was reacted with 2 bed volumes of 1 M ethylenediamine in dioxane at room temperature for 30 min and was found to couple 112 ⁇ moles of diamine per gram of resin.
  • a second portion of the aniline-treated resin was washed with 2 bed volumes of water: dioxane (70:30) at 4°C and finally by 10 bed volumes of water at 4°C on a sintered glass funnel.
  • the BSA-Sepharose prepared by triazine activation contained 42.3 mg of prqtein/g resin and the EACA-Sepharose contained 140 uncles of amine/g resin. Packed resin, 1 ml, was suspended in 2.0 ml 0.5 M Na 2 CO 3 , pH 11.2, at 50°. At the intervals indicated in Fig. 1, the resin suspension was centrifuged and an aliquot from the supernatant fraction removed and counted. The data clearly show the triazine linkage to be superior to the CNBr linkage for both proteins and small molecule ligands.
  • this graph shows that the amount of protein coupled to triazine activated resin is dependent on the amount of free protein present in the coupling reaction.
  • Fig. 2 The data of Fig. 2 is concerned with the effect of coupling of bovine serum albumin to Sepharose CL-MsT.
  • Samples of Sepharose CL-6B- MsT (100 mg), lyophilized from dioxane, were suspended in 5.0 ml of 0.15 M NaCl, 0.1 M Na Borate, pH 8.0. After mixing at 0° for 1 min, the suspensions were centrifuged and the supernatants aspirated to yield a total volume of resin plus liquid of 1.5 ml. 14 C-CM-bovme serum albumin in 1.0 ml of this same buffer was then added and the reactions were incubated with rocking at room temperature.
  • reaction mixtures contained 100 mg of activated resin in a total volume of 2.0 ml 0.1 Ma BorateT 0.15 M NaCl, pH 8.0 at the protein concentration indicated the first column of Table I ⁇ .
  • Reactions were conducted at 25 + 2oC with gentle rocking for 24 hours. The resins were then washed by filtration first with 1.0 M tris-Cl, pH 8.8 followed by 0.05 M tris-Cl, 0.15 M NaCl, pH 8.3. Resins were assayed for protein and enzymic activity as described previously.

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PCT/US1979/000081 1978-02-09 1979-02-09 Preparation of trichloro-s-triazine activated supports Ceased WO1979000609A1 (en)

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DE7979900239T DE2965887D1 (en) 1978-02-09 1979-02-09 Preparation of trichloro-s-triazine activated supports

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US05/876,240 US4229537A (en) 1978-02-09 1978-02-09 Preparation of trichloro-s-triazine activated supports for coupling ligands
US876240 1978-02-09

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0134025A1 (de) * 1983-08-09 1985-03-13 Akademie der Wissenschaften der DDR Makromolekulare Massen mit chemisch aktiven Füllstoffen, Verfahren zu ihrer Herstellung und ihre Verwendung
EP0201805A1 (de) * 1985-04-30 1986-11-20 Roche Diagnostics GmbH Stabilisiertes Sarcosinoxidase-Präparat
EP0471125A1 (en) * 1989-02-20 1992-02-19 Kanebo, Ltd. Modified protease, method of producing the same and cosmetic compositions containing the modified protease
US5133968A (en) * 1990-08-20 1992-07-28 Kanebo, Ltd. Modified protease, method of producing the same and cosmetic products containing the modified protease
EP0572354A3 (enExample) * 1992-05-28 1994-03-02 Aligena Ag
WO1995029754A1 (en) * 1994-04-28 1995-11-09 Minnesota Mining And Manufacturing Company Method of controlling density of ligand coupled onto supports and products produced therefrom
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US4229537A (en) 1980-10-21
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CA1124190A (en) 1982-05-25

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