An Fc-binding polypeptide of improved alkali stability, comprising a mutant of a parental Fc-binding domain of Staphylococcus Protein A (SpA), as defined by SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO:3, SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:22, SEQ ID NO: 51 or SEQ ID NO: 52, wherein at least the asparagine or serine residue at the position corresponding to position 11 in SEQ ID NO:4-7 has been mutated to an amino acid selected from the group consisting of glutamic acid, lysine, tyrosine, threonine, phenylalanine, leucine, isoleucine, tryptophan, methionine, valine, alanine, histidine and arginine.

An Fc-binding polypeptide of improved alkali stability, comprising a mutant of a parental Fc-binding domain of Staphylococcus Protein A (SpA), as defined by SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO:3, SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:22, SEQ ID NO: 51 or SEQ ID NO: 52, wherein at least the asparagine or serine residue at the position corresponding to position 11 in SEQ ID NO:4-7 has been mutated to an amino acid selected from the group consisting of glutamic acid, lysine, tyrosine, threonine, phenylalanine, leucine, isoleucine, tryptophan, methionine, valine, alanine, histidine and arginine.

This invention relates to a method of removing a chemical entity from a liquid using affinity chromatography. The method involves passing an elongate solid phase through a conduit through which the liquid also flows.

This invention relates to a method of removing a chemical entity from a liquid using affinity chromatography. The method involves passing an elongate solid phase through a conduit through which the liquid also flows.

The invention relates generally to sorbents and sorption devices for extracting compounds. The invention relates to a sorbent comprising a polymer and microdiamond. The invention also relates to a sorption device comprising the sorbent. The invention further relates to methods of using the sorption device for extracting organic compounds from a fluid and for preparing a sample containing organic compounds for analysis.

The invention relates generally to sorbents and sorption devices for extracting compounds. The invention relates to a sorbent comprising a polymer and microdiamond. The invention also relates to a sorption device comprising the sorbent. The invention further relates to methods of using the sorption device for extracting organic compounds from a fluid and for preparing a sample containing organic compounds for analysis.

Method for recovering a target protein from a feedstock comprising said target protein and at least one impurity compound selected from host cell proteins (HCP), DNA, RNA or other nucleic acid, the target protein being characterized by a hydrodynamic radius R.sub.h1 and the impurity compound being characterized by a hydrodynamic radius R.sub.h2, wherein R.sub.h1>R.sub.h2, comprising the following steps (i) to (iv) and optionally step (v): (i) providing a polymeric mesh comprising at least one crosslinked polymer containing positively charged amino groups, wherein the polymer has a pore size exclusion limit Rhi which can be set variably; (ii) adapting the variable pore size exclusion limit Rhi of the polymeric mesh such that R.sub.h2<R.sub.hi and R.sub.h1>R.sub.hi; (iii) contacting the polymeric mesh with the feedstock; (iv) separating the polymeric mesh containing the retained impurity compound from the feedstock containing the excluded target protein.

Method for recovering a target protein from a feedstock comprising said target protein and at least one impurity compound selected from host cell proteins (HCP), DNA, RNA or other nucleic acid, the target protein being characterized by a hydrodynamic radius R.sub.h1 and the impurity compound being characterized by a hydrodynamic radius R.sub.h2, wherein R.sub.h1>R.sub.h2, comprising the following steps (i) to (iv) and optionally step (v): (i) providing a polymeric mesh comprising at least one crosslinked polymer containing positively charged amino groups, wherein the polymer has a pore size exclusion limit Rhi which can be set variably; (ii) adapting the variable pore size exclusion limit Rhi of the polymeric mesh such that R.sub.h2<R.sub.hi and R.sub.h1>R.sub.hi; (iii) contacting the polymeric mesh with the feedstock; (iv) separating the polymeric mesh containing the retained impurity compound from the feedstock containing the excluded target protein.

The present invention relates to a process for the manufacture of microporous carbon materials to perform selective separations of nitrogen in gas mixtures such as hydrogen sulfide, carbon dioxide, methane and C.sub.2, C.sub.3 and C.sub.4.sup.+ hydrocarbons, with high efficiency, shaped of microspheres or cylinders from copolymers of poly (vinylidene chloride-co-methyl acrylate) with density of 1.3 to 1.85 g/cm.sup.3 or poly (vinylidene chloride-co-vinyl chloride) with density of 1.3 to 1.85 g/cm.sup.3, using two stages. The first stage consists of a surface passivation of the material by chemical attack in a highly alkaline alcohol solution, with the aim of effecting a precarbonization on the surface of the copolymer that during the pyrolysis process is not deformed and gradually develops microporosity. The material of the first stage presents, in the layer, percentages between 55% to 85% carbon, between 5% to 20% oxygen, and between 10% to 40% chlorine. The interior of the material presents lower percentages of carbon, between 30% to 65%, oxygen in the amount of between 2% to 6%, and chlorine in the amount of between 30% to 60%. The second stage consists of the gradual pyrolysis of the passivated copolymer, with the aim of developing microporosity and high surface area values; as well as during the melting and gas dehydrohalogenation stages thereof, the deformation of the material is avoided. The morphology of the copolymers are microspheres of 125 to 225 micrometers, or cylinders of 4 mm in height and 3 mm in diameter, which after pyrolysis reduce its size by 35% with respect to the initial one. The material of the second stage, which is already microporous carbon material, presents in the layer percentages between 90% to 100% carbon and between 10% to 0% oxygen.

The present invention relates to a process for the manufacture of microporous carbon materials to perform selective separations of nitrogen in gas mixtures such as hydrogen sulfide, carbon dioxide, methane and C.sub.2, C.sub.3 and C.sub.4.sup.+ hydrocarbons, with high efficiency, shaped of microspheres or cylinders from copolymers of poly (vinylidene chloride-co-methyl acrylate) with density of 1.3 to 1.85 g/cm.sup.3 or poly (vinylidene chloride-co-vinyl chloride) with density of 1.3 to 1.85 g/cm.sup.3, using two stages. The first stage consists of a surface passivation of the material by chemical attack in a highly alkaline alcohol solution, with the aim of effecting a precarbonization on the surface of the copolymer that during the pyrolysis process is not deformed and gradually develops microporosity. The material of the first stage presents, in the layer, percentages between 55% to 85% carbon, between 5% to 20% oxygen, and between 10% to 40% chlorine. The interior of the material presents lower percentages of carbon, between 30% to 65%, oxygen in the amount of between 2% to 6%, and chlorine in the amount of between 30% to 60%. The second stage consists of the gradual pyrolysis of the passivated copolymer, with the aim of developing microporosity and high surface area values; as well as during the melting and gas dehydrohalogenation stages thereof, the deformation of the material is avoided. The morphology of the copolymers are microspheres of 125 to 225 micrometers, or cylinders of 4 mm in height and 3 mm in diameter, which after pyrolysis reduce its size by 35% with respect to the initial one. The material of the second stage, which is already microporous carbon material, presents in the layer percentages between 90% to 100% carbon and between 10% to 0% oxygen.