Abstract:
A method of distributing a liquid in the fluid bed of a down-flow, or an up-flow, fluid bed reactor (50) comprising a vertical reactor (54) with an inlet, an outlet, and a fluid bed (A,B,C) of particles, wherein (a) the particles (51) and liquid proximal to the liquid inlet are agitated to divide the fluid bed into (i) a turbulent zone (A) having vigorously moving particles, and (ii) a non-turbulent zone (B); said non-turbulent zone adjoining said turbulent zone; and (b) that the extent of said turbulent zone is determined by a degree of agitation selected within a range from (i) a degree of agitation providing turbulence only in the uppermost/lowermost part of the fluid bed, (ii) to a degree of agitation providing turbulence of the particles throughout the fluid bed; a down-flow, or an up-flow, fluid bed reactor for use in carrying out the method; and fluid bed particles for use in carrying out the method.
Abstract:
The present invention relates to an α-enriched whey protein isolate being low in β-lactoglobulin and high in α-lactalbumin and immunoglobulin G.
Abstract:
A method of conducting an enzymatic process in which the enzymes are recovered and reused in at least a second iteration of the process, wherein each iteration of the process comprises the steps of: (a) providing a heterogeneous substrate solution, in which the substrate is fully soluble, partially soluble or insoluble; (b) adding an enzyme or mixture of enzymes to the heterogeneous substrate solution; and (c) allowing an enzymatic reaction of the substrate to proceed; wherein, after completion of step (c) for each iteration, the enzyme is recovered from the mixture resulting from step (c) according to the following steps: (d) conducting a non-packed-bed adsorption process comprising contacting the reaction mixture with an adsorbent that adsorbs the enzyme in order to separate the enzyme from the reaction mixture resulting from step (c); (e) optionally washing unbound material from the adsorbent; and (f) desorbing the enzyme from the adsorbent; and further wherein the desorbed enzyme obtained in step (f) is used in step (b) of at least one subsequent iteration of the process.
Abstract:
A primary aspect of the present invention relates to a method for the fractionation of a protein-containing mixture, said method comprising the steps of: a) optionally adjusting the pH of the mixture; b) applying said mixture to an expanded bed adsorption column comprising an adsorbent, said adsorbent comprises a particle with at least one high-density non-porous core, surrounded by a porous material; the absorbent having a particle density of at least 1.5g/ml, wherein said high-density non-porous core has a density of at least 4 g/ml, and the degree of expansion (H/H0) of the adsorbent is in the range of 1.2-5, and wherein the flow rate of applying said protein-containing mixture is at least 8 cm/min; c) optionally washing the column; d) eluting at least one protein from the adsorbent.
Abstract:
The present invention relates to a method for the isolation of immunoglobulins from a solution containing one or more immunoglobulins, comprising the following operations: a) contacting the solution containing one or more immunoglobulins having a pH in the range of 2.0 to 10.0 and a total salt content corresponding to an ionic strength of at the most 2.0 with a solid phase matrix comprising a functionalised matrix backbone carrying a plurality of functional groups of the following formula: M-SP1-L; wherein M designates the matrix backbone; SP1 designates a spacer; L designates a ligand comprising a mono- or bicyclic optionally substituted aromatic or heteroaromatic moiety; with the proviso that the molecular weight of the ligand -L is at the most 500 Dalton, whereby at least a part of the immunoglobulins becomes bound to the solid phase matrix; and b) separating the solid phase matrix having immunoglobulins bound thereto from the solution; and c) optionally washing the solid phase matrix; and d) contacting the solid phase matrix with an eluent in order to liberate one or more of the immunoglobulins from the solid phase matrix."
Abstract:
The present invention relates to particulate material having a density of at least 2.5 g/ml, where the particles of the particulate material have an average diameter of 5-75 mu m, and the particles of the particulate material are essentially constructed of a polymeric base matrix, e.g. a polysaccharide such as agarose, and a non-porous core material, e.g. steel and titanium, said core material having a density of at least 3.0 g/ml, said polymeric base matrix including pendant groups which are positively charged at pH 4.0 or which are affinity ligands for a bio-molecule. Possible pendant groups include polyethyleneimine (PEI), diethylaminoethyl (DEAE) and quaternary aminoethyl (QAE). The materials are useful in expanded bed or fluidised bed chromatography processes, in particular for purification of bio-macromolecules such as plasmid DNA, chromosomal DNA, RNA, viral DNA, bacteria and viruses.