The invention provides for the removal of a large fraction of contaminants from protein preparations while maintaining a high level of recovery using tentacle anion exchange matrix chromatography medium. Using the methods of the invention, leached affinity chromatography contaminants can be removed from recombinant protein preparations.

The present invention provides a new chemical process, a new cassette configuration, and new software for the automated production of multiple batches of an [.sup.18F]-labelled compound on a single cassette. The invention allows one synthesizer in one hot cell to produce sequentially a plurality of batches of [.sup.18F]-labelled PET tracer in the same day. In particular, the present invention provides a novel arrangement useful for purifying two consecutive batches of a reaction mixture comprising an .sup.18F-labelled compound.

A method for producing high purity D-psicose crystals having a purity of 98% (w/w) or more and a grain size of MA200 or more. The method includes: removing impurities from a D-psicose solution to obtain a purified D-psicose solution; concentrating the purified D-psicose solution; cooling the concentrated D-psicose solution to 30° C. to 40° C. through a heat exchanger; seed crystallizing the D-psicose solution at 30° C. to 40° C. to obtain a seed crystallized massecuite; and full-scale crystallizing the seed crystallized massecuite. The method can produce pure D-psicose crystals in a suitable form for industrial application through an economical crystallization process from the D-psicose solution without using organic solvents.

A method for depletion or removal of endotoxins from a known or suspected endotoxin-containing source by virtue of a solid phase extraction material in an essentially aqueous system comprising the steps of—providing a known or suspected endotoxin-containing source, —contacting the known or suspected endotoxin-containing source with a positively charged solid phase material having a surface on which ferric iron is immobilised, wherein the solid phase extraction material has immobilised the ferric iron by (2-aminoethyl)amine (TREN) ligand—incubating the known or suspected endotoxin-containing source for a period of time sufficient to bind endotoxin to the porous solid phase material, —separating the solid phase material from the essentially aqueous system, —optionally isolating the essentially aqueous system freed or depleted from endotoxin.

Disclosed is a chromatographic method for separating and purifying a recombinant human fibronectin from a genetically engineered rice seed that expresses the human fibronectin. In the method, the genetically engineered rice seed is milled, mixed with an extraction buffer, and then filtered to obtain a crude extract comprising the recombinant human fibronectin; the crude extract comprising the recombinant human fibronectin is subjected to cation exchange chromatography, so as to perform primary separation and purification, thereby obtaining a primary product comprising the recombinant human fibronectin; and the primary product is subjected to anion exchange chromatography so as to perform final separation and purification to obtain the recombinant human fibronectin as a target substance. The method is low cost and easily utilized on an industrial scale. The obtained OsrhFn target substance has a SEC-HPLC purity greater than 95% with excellent bioactivity.

The present invention relates to a method for separating at least one soluble protein fraction from an aggregated casein-containing material, the method comprises the steps of: (i) providing the aggregated casein-containing material; (ii) Contacting the aggregated casein-containing material with a chromatographic support allowing one or more soluble protein(s) present in the aggregated casein-containing material to be retained by the chromatographic support; (iii) Obtaining a permeate fraction from the chromatographic support comprising aggregated casein; (iv) Optionally washing the chromatographic support; (v) Subjecting the chromatographic support to at least one elution buffer obtaining at least one soluble protein fraction from the chromatographic support; and wherein the chromatographic support comprises one or more mixed-mode ligands capable of binding the soluble proteins from the aggregated casein-containing material.

The present invention relates to a method for separating at least one soluble protein fraction from an aggregated casein-containing material, the method comprises the steps of: (i) providing the aggregated casein-containing material; (ii) Contacting the aggregated casein-containing material with a chromatographic support allowing one or more soluble protein(s) present in the aggregated casein-containing material to be retained by the chromatographic support; (iii) Obtaining a permeate fraction from the chromatographic support comprising aggregated casein; (iv) Optionally washing the chromatographic support; (v) Subjecting the chromatographic support to at least one elution buffer obtaining at least one soluble protein fraction from the chromatographic support; and wherein the chromatographic support comprises one or more mixed-mode ligands capable of binding the soluble proteins from the aggregated casein-containing material.

Polydisperse and charged polysaccharides are fractionated into low polydispersity fractions (preferably having pd<1.1), each containing species within a narrow range of molecular weights. An aqueous solution of the polydisperse polysaccharides is contacted with an ion exchange resin in a column and the polysaccharides are subjected to selective elution by aqueous elution buffer. The selective elution consists of at least 3 sequential elution buffers having different and constant ionic strength and/or pH and in which the subsequent buffers have ionic strength and/or pH than those of the preceding step. The new preparations are particularly suitable for the production of PSA-derivatised therapeutic agents intended for use in humans and animals.

The present invention relates to methods for purifying nucleic acids. In particular, the present invention relates to a method for separating guanine-rich oligonucleotides from quadruplex secondary structures formed from the oligonucleotides using monolithic anion exchange chromatography. Mobile phase parameters that control quadruplex formation and enable separation of the intact quadruplex from the single-strand oligonucleotide are also described.

The invention relates to a method of separating and recovering xylose from a xylose-containing plant-based solution. The method is performed in a chromatographic separation system, which comprises one or more weak base anion exchange resins and optionally one or more other resins selected from strong acid cation exchange resins and weak acid cation exchange resins, by passing the solution through the separation system, followed by recovering at least one fraction enriched in xylose. Optionally, a rhamnose fraction may also be recovered.